JP2013107909A - Manufacturing method of isocyanate using diaryl carbonate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method in which there are not various problems shown in a prior art when isocyanate is manufactured without using phosgene, and that can stably manufacture isocyanate for the long period of time in good yield.SOLUTION: The manufacturing method of isocyanate includes: a process in which diaryl carbonate and an amine compound are made to react in the presence of an aromatic hydroxy compound as a reaction solvent, thereby a reaction mixture that includes carbamic acid aryl having an aryl group originated from diaryl carbonate, an aromatic hydroxy compound originated from diaryl carbonate, and diaryl carbonate is obtained; a process in which the reaction mixture is transported to a thermal cracking reactor; and a process in which the carbamic acid aryl is subjected to a thermal decomposition reaction to obtain isocyanate, wherein a reactor in which the reaction of diaryl carbonate and an amine compound is performed and a thermal cracking reactor of carbamic acid aryl are different.

Description

  The present invention relates to a method for producing an isocyanate using diaryl carbonate as a raw material.

  Isocyanates are widely used as raw materials for producing polyurethane foams, paints, adhesives and the like. The main industrial production method of isocyanate is a reaction between an amine compound and phosgene (phosgene method), and almost all of the world production is produced by the phosgene method. However, the phosgene method has many problems.

The first is to use a large amount of phosgene as a raw material. Phosgene is extremely toxic and requires special handling in order to prevent exposure to workers and special equipment to remove waste.
Secondly, in the phosgene method, a large amount of highly corrosive hydrogen chloride is produced as a by-product, so a process for removing the hydrogen chloride is required, and the produced isocyanate is often hydrolyzed. If the isocyanate produced by the phosgene method is used, the weather resistance and heat resistance of the polyurethane product may be adversely affected.

  From such a background, a method for producing an isocyanate compound without using phosgene is desired. As one of the methods for producing an isocyanate compound that does not use phosgene, a method by thermal decomposition of a carbamic acid ester has been proposed. It has long been known that an isocyanate and a hydroxy compound can be obtained by thermal decomposition of a carbamic acid ester (see, for example, Non-Patent Document 1). The basic reaction is illustrated by the following formula:

(Where:
R represents an a-valent organic residue;
R ′ represents a monovalent organic residue,
a represents an integer of 1 or more. )

Among carbamates, aryl carbamates whose ester groups are aromatic groups have the advantage that the temperature of the thermal decomposition reaction can be set lower than alkyl carbamates whose ester groups are alkyl groups (see Patent Document 1). ).
Various methods for producing aryl carbamate have been disclosed so far.
According to the description of Patent Document 2, by reacting an alkyl monoamine with a diaryl carbonate in the presence of a solvent such as benzene, dioxane, carbon tetrachloride, the corresponding aryl monoalkylcarbamate is obtained in a yield of 90 to 95%. It is described that it is obtained. Patent Document 3 proposes a method for continuously producing methylcarbamic acid phenyl ester from methylamine and diphenyl carbonate.

  However, any of these methods is a method for producing an aryl alkyl carbamate using a lower alkyl monoamine as an amine, and not a method for producing an alkyl alkyl carbamate. When producing a corresponding alkyl polycarbamic acid aryl ester from an alkyl polyamine such as an alkyl diamine or an alkyl triamine, there is a difficult problem completely different from the case of using an alkyl monoamine. This is because, in the case of alkyl monoamine, in addition to the reaction represented by the formula (2), the urea compound is only by-produced by the side reaction represented by the formula (3) and / or the formula (4). In the case of alkyl polyamines such as alkyl diamines and alkyl triamines, for example, a great many types of urea compounds such as compounds of formula (5) and / or formula (6) and / or formula (7) Because it is a by-product.

(Where:
R ′ represents a monovalent alkyl group or an aromatic group,
Ar represents a monovalent aromatic group,
p, q, and r each represent an integer of 1 or more. )

  That is, the problem of reducing the yield of aryl polyalkylcarbamate, which is the target compound, by the by-product reactions of these various urea compounds, and the target product from the mixture of these urea compounds and polyurea compounds. There is a problem that it is very difficult to separate and purify.

  For these reasons, very few attempts have been made to produce alkyl polycarbamic acid aryl esters from alkyl polyamines and diaryl carbonates, but some have been reported. For example, according to the specification of Patent Document 4, 1 mol of 1,6-hexamethylenediamine was dissolved in 5 times amount of benzene in a solution in which 1 mol of diphenyl carbonate was dissolved in 5 times amount of benzene. There has been proposed a method for obtaining 1,6-hexamethylenedicarbamic acid phenyl ester by a reaction method in which the solution is added dropwise and stirred at 80 ° C. According to this patent specification, in order to proceed the reaction advantageously, it is important to use a solvent that does not dissolve the product 1,6-hexamethylene dicarbamic acid phenyl ester as much as possible as the reaction solvent, It is described that hydrocarbons such as benzene and chlorobenzene are preferable as such a solvent.

  From this point of view, in Non-Patent Document 3, the reaction of 0.01 mol of diphenyl carbonate and 0.005 mol of 1,6-hexamethylenediamine is 20 hours using 40 mL of toluene as a reaction solvent. The target 1,6-hexamethylene dicarbamic acid phenyl ester is obtained by performing for a long time. However, even when such a large amount of toluene was used, the yield was 93%, and a urea compound and a polyurea compound that had to be separated were by-produced, which was a problem.

  Patent Document 5 discloses a method for producing a diurethane compound in which a diaryl carbonate and an amine compound are reacted in the presence of a protonic acid. However, in order to industrially implement the production method disclosed in Patent Document 5, it cannot be said that the yield of the diurethane compound is sufficient, and it is necessary to carry out the reaction at a low temperature in order to suppress side reactions. It has the disadvantage that time is long.

  Patent Document 6 describes a method of reacting a diaryl carbonate and an aromatic polyamine in the presence of a heterocyclic tertiary amine such as 2-hydroxypyridine. This method has the problem that an expensive catalyst is required in an equimolar amount or more with respect to the reaction substrate and the reaction rate is low.

  According to Patent Document 7, a method for synthesizing an aromatic urethane in which an aromatic amine, a diaryl carbonate, and a Lewis acid catalyst are reacted at a temperature of 140 ° C. to 230 ° C. is described. Use of this makes it difficult to corrode the equipment and to separate and recover the product.

  In Patent Document 8, when an alkylpolyamine and diaryl carbonate are reacted to produce an alkylpolycarbamic acid aryl ester, 1 to 3 equivalents of diaryl carbonate per amino group of the alkylpolyamine are used, and an aromatic hydroxy compound is used as a reaction solvent. Is used to carry out the reaction in a substantially uniform dissolved state, and a method for producing an alkyl polycarbamic acid aryl ester is disclosed. According to the patent document, an alkyl polycarbamic acid aryl ester is usually obtained in a high yield and high selectivity of 96% or more, and in a preferred embodiment, 98% or more. However, since the production of the urea compound has been confirmed although it is a very small amount, the production of the urea compound cannot be completely avoided.

  On the other hand, in the thermal decomposition reaction of carbamic acid ester, various irreversible side reactions such as unfavorable thermal modification reaction of carbamic acid ester and condensation reaction of isocyanate generated by the thermal decomposition are likely to occur simultaneously. As a side reaction, for example, a reaction that forms a urea bond represented by the following formula (8), a reaction that generates carbodiimides represented by the following formula (9), or the following formula (10), for example: The reaction which produces | generates the isocyanurates which are mentioned is mentioned (refer nonpatent literature 1, 2).

These side reactions not only lead to a decrease in the yield and selectivity of the target isocyanate, but especially in the production of polyisocyanates, it is difficult to operate for a long period of time, such as the precipitation of polymer solids and plugging of the reactor. There was a case.
Various methods have been proposed for producing isocyanates using carbamic acid esters as raw materials.

According to Patent Document 9, aromatic diisocyanate and / or polyisocyanate is produced through the following two steps. Specifically, in the first step, the aromatic primary amine and / or aromatic primary polyamine is combined with an O-alkyl carbamate, in the presence or absence of a catalyst, and in the presence of urea and alcohol or The reaction is carried out in the absence to produce an aryl diurethane and / or an aryl polyurethane, and the resulting ammonia is removed if necessary. In the second step, aromatic isocyanate and / or aromatic polyisocyanate is obtained by thermal decomposition of aryl diurethane and / or aryl polyurethane.
Several methods are known for producing the corresponding isocyanates and alcohols by thermal decomposition of (cyclo) aliphatic and in particular aromatic monourethanes and diurethanes, which are carried out in the gas phase at high temperatures. Alternatively, there is a method that is performed in a liquid phase under a relatively low temperature condition. However, the reaction mixture causes, for example, the above-mentioned side reactions, and forms precipitates, polymeric substances and clogs in the reactor and the recovery device, and the substances form a fixed substance on the reactor wall surface. If the isocyanate is produced over a long period of time, the economic efficiency is poor.
Therefore, in order to improve the yield in the thermal decomposition of urethane, for example, a chemical method, for example, use of a special catalyst (see Patent Document 10, Patent Document 11) or a catalyst in combination with an inert solvent (Patent Document) 12).

  Specifically, Patent Document 13 discloses hexamethylene diisocyanate as a method for producing hexamethylene diisocyanate in the presence of dibenzyltoluene used as a solvent and in the presence of a catalyst mixture comprising methyltoluenesulfonate and diphenyltin dichloride. A method for thermally decomposing diethylurethane is described. However, nothing is described in detail about the preparation and isolation of the starting components and the purification and optional recovery of the solvent and catalyst mixture, so it was impossible to judge the economic efficiency of this process. It was.

  According to the method described in Patent Document 14, urethane can be easily decomposed into isocyanate and alcohol in a carbon-containing fluidized bed without using a catalyst. According to the description in Patent Document 15, hexamethylene dialkyl urethane is used in the presence or absence of a gas-permeable packaging material made of, for example, carbon, copper, brass, steel, zinc, aluminum, titanium, chromium, cobalt, or quartz. It can decompose in the gas phase at temperatures above 300 ° C. in the presence, resulting in hexamethylene diisocyanate. According to the description in Patent Document 14, the process is carried out in the presence of a hydrogen halide and / or a hydrogen halide donor. However, this method cannot achieve a yield of hexamethylene diisocyanate of 90% or more. This is because the decomposition products partially recombine to form urethane bonds. Therefore, further purification of hexamethylene diisocyanate by distillation is required, and yield loss often increases.

  In addition, US Pat. No. 6,057,059 provides monocarbamates with good yields at relatively low temperatures, preferably under reduced pressure, in the presence or absence of catalysts and / or stabilizers, without the use of solvents. It is disclosed that it can be decomposed. The decomposition products (monoisocyanate and alcohol) are removed from the boiling reaction mixture by distillation and collected separately by fractional condensation. In order to remove the by-products formed by pyrolysis, a method for partially removing the reaction mixture has been described in general form. Therefore, although by-products can be removed from the bottom of the reactor, the problem with the case where the reactor adheres to the reactor wall surface still remains, and the problem with long-term operation has not been solved. In addition, nothing is described about the industrial use of this removed residue (containing a large amount of useful components).

  According to the description in US Pat. No. 6,057,059, the thermal decomposition of aliphatic, alicyclic or aromatic polycarbamates is carried out as a catalyst and auxiliary in the presence of an inert solvent at 150-350 ° C. and 0.001-20 bar. It is carried out in the presence or absence of hydrogen chloride, organic acid chloride, alkylating agent or organotin chloride. The by-product produced can be removed continuously from the reactor, for example together with the reaction solution, and a corresponding amount of fresh solvent or recovered solvent is added simultaneously. The disadvantage of this method is that, for example, the use of a refluxing solvent results in a reduction in the space-time yield of the polyisocyanate and, in addition, a large amount of energy is required, including, for example, solvent recovery. Furthermore, the auxiliaries used are volatile under the reaction conditions and can cause contamination of the decomposition products. In addition, the amount of residue is large with respect to the produced polyisocyanate, and there is room for doubt as to economic efficiency and reliability of industrial methods.

  Patent Document 18 discloses carbamates, for example, alicyclic diurethanes 5- (ethoxycarbonylamino) -1- (ethoxycarbonyl) supplied along the inner surface of the tubular reactor in liquid form in the presence of a high-boiling solvent. One process is described for the continuous pyrolysis of (aminomethyl) -1,3,3-trimethylcyclohexane. This process has the disadvantages of low yield and low selectivity in the production of (cyclo) aliphatic diisocyanates. Also, nothing is described for a continuous process involving the recovery of recombined or partially decomposed carbamates and no mention of after-treatment of solvents containing by-products and catalysts.

  It can be easily imagined that an isocyanate can be produced using a diaryl carbonate and an amine compound as raw materials by combining the above-described method for producing an aryl carbamate and the method for producing an isocyanate by thermal decomposition of a carbamate. However, in order to combine the above-described method for producing aryl carbamate with the method for producing isocyanate by thermal decomposition of aryl carbamate, the aryl carbamate is separated from the reaction solution obtained by reacting diaryl carbonate with an amine compound. Then, either a method of performing a complicated operation of performing the thermal decomposition reaction of the aryl carbamate or a method of using the reaction solution obtained in the production of the aryl carbamate as it is for the thermal decomposition reaction is adopted.

In this regard, Patent Document 19 discloses that a urethane compound is synthesized by reacting an aromatic amine and diaryl carbonate in the presence of a Lewis acid catalyst, and then the urethane compound is used in the diaryl carbonate used in the synthesis of the urethane compound. A method for synthesizing an aromatic isocyanate by pyrolysis is disclosed. In this patent document, a urethane-containing reaction solution obtained by reacting an amine compound and diaryl carbonate in the presence of a Lewis acid catalyst is subjected to a thermal decomposition reaction in a reactor used for the urethane synthesis to produce an isocyanate. A method is illustrated.
U.S. Pat. No. 3,992,430 Japanese Patent Application Publication No. 52-71443 Japanese Patent Application Publication No. 61-183257 German Patent No. 925496 Japanese Patent Application Publication No. 10-316645 Japanese Patent Application Publication No. 52-136147 Japanese Patent Application Publication No. 2004-262834 Japanese Patent Application Publication No. 1-230550 U.S. Pat. No. 4,290,970 US Pat. No. 2,692,275 US Pat. No. 3,734,941 U.S. Pat. No. 4,081,472 U.S. Pat. No. 4,388,426 U.S. Pat. No. 4,482,499 U.S. Pat. No. 4,613,466 U.S. Pat. No. 4,386,033 U.S. Pat. No. 4,388,246 US Pat. No. 4,692,550 Japanese Patent Application Publication No. 2004-262835 Berchte der Deutschen Chemischen Gesellshaft, 3, 653, 1870 Journal of American Chemical Society, 81, 2138, 1959 Journal of Polymer Science Polymer Chemistry Edition, 17, 835, 1979

However, since the synthesis reaction and the thermal decomposition reaction of the urethane compound are performed in the same reactor, it is not possible to select a reactor and reaction conditions suitable for the synthesis reaction and the thermal decomposition reaction of the urethane compound. In fact, according to the example of Patent Document 19, the yield of isocyanate is low. Further, Patent Document 19 does not have a detailed description regarding a method for continuously producing isocyanate, and is not satisfactory from the viewpoint of producing isocyanate efficiently industrially.
As described above, the method for producing aryl carbamate using diaryl carbonate and an amine compound as raw materials and producing isocyanate via the aryl carbamate has many problems to be solved and has not been industrialized yet. It is.

  An object of the present invention is to provide a method for producing an isocyanate using a diaryl carbonate and an amine compound without any of the various problems found in the prior art.

  As a result of intensive studies on the above problems, the present inventors transferred a mixture obtained by reacting a diaryl carbonate and an amine compound under specific conditions to a pyrolysis reactor under specific conditions, A method for producing an isocyanate by subjecting a carbamic acid ester contained in the mixture to a thermal decomposition reaction has been found, and the present invention has been completed.

（式中；
Ｒ¹は、炭素数６〜１２の芳香族基を表す。）
前項[１]ないし[２０]のうち何れか一項に記載の製造方法、
[２２] 該炭酸ジアリールが、金属原子を０．００１ｐｐｍ〜１０％含有する前項[２１]に記載の製造方法、
[２３] 該金属原子が、鉄、ニッケル、コバルト、亜鉛、スズ、銅、チタンの中からなる群から選ばれる１種もしくは複数種の金属である前項[２２]に記載の製造方法、
[２４] 該炭酸ジアリールが、下記の工程（１）〜工程（３）を含む工程によって製造される炭酸ジアリールである、
工程（１）：スズ−酸素−炭素結合を有する有機スズ化合物と二酸化炭素とを反応させて炭酸ジアルキルを含有する反応混合物を得る工程；
工程（２）：該反応混合物を分離して、炭酸ジアルキルと残留液とを得る工程；
工程（３）：工程（２）で分離された炭酸ジアルキルと芳香族ヒドロキシ化合物Ａとを反応させて炭酸ジアリールを得、副生するアルコールを回収する工程；
前項[１]ないし[２３]のうち何れか一項に記載の製造方法、
[２５] 該芳香族ヒドロキシ化合物Ａが、炭素数６〜１２の芳香族ヒドロキシ化合物である前項[２４]に記載の製造方法、
[２６] 該炭酸ジアリールが、下記の工程（４）および工程（５）をさらに含む工程によって製造される炭酸ジアリールである、
工程（４）：工程（２）で得られた残留液とアルコールを反応させて、スズ−酸素−炭素結合を有する有機スズ化合物と水を形成し、該水を反応系より除去する工程；
工程（５）：工程（４）で得られたスズ−酸素−炭素結合を有する有機スズ化合物を、工程（１）のスズ−酸素−炭素結合を有する有機スズ化合物として再利用する工程；
前項[２４]または[２５]に記載の製造方法、
[２７] 該工程（３）で回収したアルコールを、該工程（４）のアルコールの一部もしくは全部として使用する前項[２６]に記載の製造方法、
[２８] 熱分解反応器から回収された液相成分または気相成分から炭酸ジアリールを分離回収し、該炭酸ジアリールを出発物質としての炭酸ジアリールとして再利用する前項[９]ないし[２７]のうち何れか一項に記載の製造方法、
[２９] 熱分解反応器から回収された液相成分または気相成分から芳香族ヒドロキシ化合物を分離回収し、該芳香族ヒドロキシ化合物を該工程（３）の芳香族ヒドロキシ化合物Ａ、もしくは、該反応溶媒としての該芳香族ヒドロキシ化合物としてリサイクルする前項[１]または[２４]に記載の製造方法、
[３０] 該アミン化合物がポリアミン化合物である前項[１]ないし[２９]のうち何れか一項に記載の製造方法、
[３１] 該アミン化合物が下記式（１２）で表わされる化合物である、

（式中；
Ｒ²は、炭素、酸素から選ばれる原子を含む炭素数１〜２０の脂肪族基および炭素数６〜２０の芳香族基からなる群から選ばれる１つの基であって、ｎに等しい原子価を有する基を表し、
ｎは、２〜１０の整数である。）
前項[３０]に記載の製造方法、
[３２] 該アミン化合物が、式（１２）において、ｎが２であるジアミン化合物である前項[３１]に記載の製造方法、
[３３] 炭酸エステルとアミン化合物とを反応させる反応器へのアミン化合物の供給が、液体の状態でおこなわれる前項[１]ないし[３２]のうち何れか一項に記載の製造方法、
[３４] 炭酸エステルとアミン化合物を反応させる反応器へのアミン化合物の供給が、アルコール、水、または炭酸エステルとの混合物としておこなわれる前項[１]ないし[３３]のうち何れか一項に記載の製造方法、
を提供する。 That is, the present invention
[1] In a reactor in which a diaryl carbonate and an amine compound are reacted, the diaryl carbonate and the amine compound are reacted to form an aryl carbamate having an aryl group derived from the diaryl carbonate and an aromatic derived from the diaryl carbonate. Obtaining a reaction mixture containing a hydroxy compound and a diaryl carbonate;
Transferring the reaction mixture to a pyrolysis reactor connected by piping to the reactor in which the reaction between the diaryl carbonate and the amine compound takes place;
Obtaining an isocyanate by subjecting the aryl carbamate to a thermal decomposition reaction;
A process for producing isocyanates comprising
[2] The production method according to [1] above, further comprising a step of washing the high-boiling by-product adhering to the thermal decomposition reactor with an acid.
[3] The production method according to [1] or [2] above, wherein the reaction between the diaryl carbonate and the amine compound is performed at a stoichiometric ratio of the diaryl carbonate to the amino group constituting the amine compound of 1 or more.
[4] The production method according to any one of [1] to [3], wherein the diaryl carbonate and the amine compound are reacted in the presence of an aromatic hydroxy compound as a reaction solvent.
[5] The compound ArOH having a structure in which a hydrogen atom is added to the group ArO constituting the diaryl carbonate ArOCOOAr (Ar represents an aromatic group and O represents an oxygen atom) as the aromatic hydroxy compound as a reaction solvent The production method according to [4] above, which is an aromatic hydroxy compound of the same kind as
[6] The production method according to any one of [1] to [5], wherein the reaction mixture is supplied as a liquid to a pyrolysis reactor,
[7] The production method according to [6], wherein the reaction mixture is maintained in a temperature range of 10 ° C. to 180 ° C. and supplied to the thermal decomposition reactor.
[8] The production method according to any one of [1] to [7], wherein the reaction mixture is continuously supplied to the pyrolysis reactor.
[9] Any one of [1] to [8] above, wherein the low boiling point component generated in the pyrolysis reaction is recovered from the pyrolysis reactor as a gas phase component, and the liquid phase component is recovered from the bottom of the reactor. The manufacturing method according to one item,
[10] The production method according to [9], wherein the recovery of the gas phase component and the recovery of the liquid phase component are continuously performed,
[11] The preceding item [9] or [9] wherein the isocyanate obtained by the thermal decomposition reaction of the aryl carbamate is recovered from the thermal decomposition reactor as a gas phase component, and the liquid phase component containing diaryl carbonate is recovered from the bottom of the reactor. 10].
[12] A gas phase component containing isocyanate recovered from the pyrolysis reactor, further comprising a step of recovering isocyanate by distilling and separating the gas phase component containing isocyanate recovered from the pyrolysis reactor by a distillation column Is supplied to the distillation column in the gas phase, [11]
[13] The liquid phase component containing the diaryl carbonate is a mixture containing an aryl carbamate, and a part or all of the mixture is supplied to the top of the reactor according to [11] or [12] Described manufacturing method,
[14] The production method according to [9] or [10] above, wherein the isocyanate obtained by the thermal decomposition reaction of the aryl carbamate is recovered as a liquid phase component from the bottom of the reactor in which the thermal decomposition reaction occurs.
[15] The liquid phase component recovered from the bottom of the reactor contains isocyanate and aryl carbamate, and part or all of the isocyanate is separated from the liquid phase component, and the remaining part or all of the reactor is The manufacturing method according to [14] above, which is supplied to the upper part,
[16] The production method according to [14] or [15], wherein the isocyanate-containing mixture recovered from the thermal decomposition reactor is distilled and separated to recover the isocyanate,
[17] The type of the reactor in which the reaction between the diaryl carbonate and the amine compound is performed and the type of the thermal decomposition reactor may be the same or different, and the reaction between the diaryl carbonate and the amine compound is performed. And the pyrolysis reactor is at least one reactor selected from the group consisting of a column reactor and a tank reactor, [1] to [16], Manufacturing method,
[18] The paragraph [17], wherein the pyrolysis reactor is composed of at least one reactor selected from the group consisting of an evaporator, a continuous multistage distillation column, a packed column, a thin film evaporator, and a falling film evaporator. Manufacturing method,
[19] The production method according to any one of [1] to [18], wherein the reaction between the diaryl carbonate and the amine compound is performed in the presence of a catalyst;
[20] The production method according to any one of [1] to [19], wherein the thermal decomposition reaction is performed in a liquid phase;
[21] The diaryl carbonate is a compound represented by the following formula (11):

(Where:
R ¹ represents an aromatic group having 6 to 12 carbon atoms. )
The manufacturing method according to any one of [1] to [20],
[22] The production method of the above-mentioned [21], wherein the diaryl carbonate contains 0.001 ppm to 10% of a metal atom,
[23] The production method according to [22], wherein the metal atom is one or more metals selected from the group consisting of iron, nickel, cobalt, zinc, tin, copper, and titanium,
[24] The diaryl carbonate is a diaryl carbonate produced by steps including the following steps (1) to (3):
Step (1): A step of reacting an organotin compound having a tin-oxygen-carbon bond with carbon dioxide to obtain a reaction mixture containing dialkyl carbonate;
Step (2): separating the reaction mixture to obtain a dialkyl carbonate and a residual liquid;
Step (3): a step of reacting the dialkyl carbonate separated in the step (2) with the aromatic hydroxy compound A to obtain a diaryl carbonate and recovering by-produced alcohol;
The manufacturing method according to any one of [1] to [23],
[25] The production method according to [24], wherein the aromatic hydroxy compound A is an aromatic hydroxy compound having 6 to 12 carbon atoms,
[26] The diaryl carbonate is a diaryl carbonate produced by a process further comprising the following steps (4) and (5):
Step (4): a step of reacting the residual liquid obtained in Step (2) with an alcohol to form an organic tin compound having a tin-oxygen-carbon bond and water, and removing the water from the reaction system;
Step (5): A step of reusing the organic tin compound having a tin-oxygen-carbon bond obtained in step (4) as the organic tin compound having a tin-oxygen-carbon bond in step (1);
The production method according to [24] or [25],
[27] The production method according to [26], wherein the alcohol recovered in the step (3) is used as a part or all of the alcohol in the step (4).
[28] Among the preceding items [9] to [27], diaryl carbonate is separated and recovered from a liquid phase component or a gas phase component recovered from a thermal decomposition reactor, and the diaryl carbonate is reused as a diaryl carbonate as a starting material. The production method according to any one of the above,
[29] The aromatic hydroxy compound is separated and recovered from the liquid phase component or the gas phase component recovered from the thermal decomposition reactor, and the aromatic hydroxy compound is recovered from the aromatic hydroxy compound A in the step (3) or the reaction. The production method according to [1] or [24] above, wherein the aromatic hydroxy compound is recycled as a solvent.
[30] The production method according to any one of [1] to [29], wherein the amine compound is a polyamine compound;
[31] The amine compound is a compound represented by the following formula (12):

(Where:
R ² is one group selected from the group consisting of an aliphatic group having 1 to 20 carbon atoms and an aromatic group having 6 to 20 carbon atoms containing an atom selected from carbon and oxygen, and has a valence equal to n Represents a group having
n is an integer of 2 to 10. )
The production method according to [30],
[32] The production method of the above-mentioned [31], wherein the amine compound is a diamine compound wherein n is 2 in formula (12),
[33] The production method according to any one of [1] to [32], wherein the amine compound is supplied to the reactor for reacting the carbonate ester and the amine compound in a liquid state.
[34] The amine compound according to any one of [1] to [33], wherein the supply of the amine compound to the reactor for reacting the carbonate ester and the amine compound is performed as a mixture of alcohol, water, or carbonate ester. Manufacturing method,
I will provide a.

  By the method of the present invention, it is possible to produce an isocyanate with good yield continuously over a long period using a diaryl carbonate and an amine compound as raw materials.

It is a conceptual diagram showing the continuous manufacturing apparatus of the carbonate ester concerning the Example of this invention. It is a conceptual diagram showing the aromatic carbonate manufacturing apparatus concerning the Example of this invention. It is a conceptual diagram showing the aromatic carbonate manufacturing apparatus concerning the Example of this invention. It is a conceptual diagram showing the alcohol refinement | purification apparatus concerning the Example of this invention. It is a conceptual diagram showing the diaryl carbonate refinement | purification apparatus concerning the Example of this invention. It is a conceptual diagram showing the diaryl carbonate refinement | purification apparatus concerning the Example of this invention. It is a conceptual diagram showing the aryl carbamate manufacturing apparatus concerning the Example of this invention. It is a conceptual diagram showing the isocyanate manufacturing apparatus concerning the Example of this invention. It is a conceptual diagram showing the isocyanate manufacturing apparatus concerning the Example of this invention. It is a conceptual diagram showing the isocyanate manufacturing apparatus concerning the Example of this invention. It is a conceptual diagram showing the isocyanate manufacturing apparatus concerning the Example of this invention. It is a conceptual diagram showing the isocyanate manufacturing apparatus concerning the Example of this invention. It is a conceptual diagram showing the isocyanate manufacturing apparatus concerning the Example of this invention. It is a conceptual diagram showing the isocyanate manufacturing apparatus concerning the Example of this invention. It is a conceptual diagram showing the isocyanate manufacturing apparatus concerning the Example of this invention. It is a conceptual diagram showing the aryl carbamate manufacturing apparatus concerning the Example of this invention.

(Figure 1)
101, 107: distillation tower,
102: tower reactor,
103, 106: thin film distillation apparatus,
104: autoclave,
105: Decarburization tank,
111, 112, 117: reboiler,
121, 123, 126, 127: condenser,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17: line (FIG. 2)
202: Continuous multistage distillation column 205, 206: Storage tank 201: Preheater 203: Condenser 204: Reboiler 21, 22, 23, 24, 25: Line (FIG. 3)
302: Continuous multistage distillation columns 305, 306: Storage tank 301: Preheater 303: Condenser 304: Reboiler 31, 32, 33, 34, 35: Line (FIG. 4)
402: Continuous multistage distillation columns 405, 406: Storage tank 401: Preheater 403: Condenser 404: Reboiler 41, 42, 43, 44, 45: Line (FIG. 5)
502: Continuous multistage distillation columns 505, 506: Storage tank 501: Preheater 503: Condenser 504: Reboiler 51, 52, 53, 54, 55: Line (FIG. 6)
602: Continuous multistage distillation columns 605, 606: Storage tank 601: Preheater 603: Condenser 604: Reboiler 61, 62, 63, 64, 65: Line (FIG. 7)
701, 702, 703, 705: Storage tank 704: Stirring tank 71, 72, 73, 74: Line (FIG. 8)
801: Thin-film distillation apparatus 802, 803: Continuous multistage distillation columns 808, 809, 810: Storage tanks 803, 806: Condensers 804, 807: Reboilers 81, 82, 83, 84, 85, 86, 87, 88, 89, 90 , 91, 92, 93, 94: line (FIG. 9)
902: Continuous multistage distillation column 905, 906: Storage tank 901: Preheater 903: Condenser 904: Reboiler 95, 96, 97, 98, 99: Line (FIG. 10)
1002: Continuous multistage distillation column 1005, 1006: Storage tank 1001: Preheater 1003: Condenser 1004: Reboiler A1, A2, A3, A4, A5: Line (FIG. 11)
1102: Continuous multistage distillation column 1105, 1106: Storage tank 1101: Preheater 1103: Condenser 1104: Reboiler B1, B2, B3, B4, B5: Line (FIG. 12)
1201: Thin-film distillation apparatus 1202, 1205, 1208: Continuous multistage distillation columns 1203, 1206, 1209: Condensers 1204, 1207, 1210: Reboilers C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17, C18: Line (FIG. 13)
1301, 1304, 1307: continuous multistage distillation columns 1302, 1305, 1308: condensers 1303, 1306, 1309: reboilers D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13 , D14, D15: Line (Fig. 14)
1401, 1402, 1403, 1409, 1411: storage tank 1404: stirring tank 1405, 1406: continuous multistage distillation column 1407, 1410: condenser 1408, 1412: reboiler E1, E2, E3, E4, E5, E6, E7, E8, E9, E10, E11, E12, E13: Line (FIG. 15)
1501, 1502, 1503: Storage tank 1504: Stirring tank 1506, 1509, 1512: Continuous multistage distillation columns 1505, 1508, 1511: Condensers 1507, 1510, 1513: Reboilers F1, F2, F3, F4, F5, F6, F7, F8, F9, F10, F11, F12, F13, F14, F15, F16, F17, F18: line (FIG. 16)
1601, 1602, 1603, 1606: storage tank 1604: stirring tank 1605: column 1607: condensers G1, G2, G3, G4, G5, G6: line

  Hereinafter, the best mode for carrying out the present invention (hereinafter referred to as “the present embodiment”) will be described in detail. In addition, this invention is not limited to the following embodiment, It can implement by changing variously within the range of the summary.

In the manufacturing method in the present embodiment, a diaryl carbonate and an amine compound are reacted in the presence of an aromatic hydroxy compound as a reaction solvent, and the aryl carbamate having an aryl group derived from the diaryl carbonate is derived from the diaryl carbonate. A step of obtaining a reaction mixture containing an aromatic hydroxy compound and diaryl carbonate, a step of transferring the reaction mixture to a thermal decomposition reactor, and a step of obtaining an isocyanate by subjecting the aryl carbamate to a thermal decomposition reaction And a process for producing an isocyanate comprising:
The reactor in which the reaction between the diaryl carbonate and the amine compound is performed is different from the thermal decomposition reactor of the aryl carbamate.

First, the diaryl carbonate and amine compound used in the production method in the present embodiment will be described.
The diaryl carbonate used in the production method in the present embodiment is a compound represented by the following formula (13).

(Where:
R ¹ represents an aromatic group having 6 to 20 carbon atoms. )

R ^{1 in the} above formula (13) is preferably an aromatic hydrocarbon group having 6 to 20 carbon atoms, and more preferably an aromatic hydrocarbon group having 6 to 12 carbon atoms. R ¹ can also be a diaryl carbonate which is an aromatic hydrocarbon group having 21 or more carbon atoms, but from the viewpoint of facilitating separation from an isocyanate produced by a thermal decomposition reaction of a carbamate described later, The number of carbon atoms constituting R ¹ is preferably 20 or less.

Examples of such R ¹ include phenyl group, methylphenyl group (each isomer), ethylphenyl group (each isomer), propylphenyl group (each isomer), butylphenyl group (each isomer), pentyl Phenyl group (each isomer), hexylphenyl group (each isomer), dimethylphenyl group (each isomer), methylethylphenyl group (each isomer), methylpropylphenyl group (each isomer), methylbutylphenyl group (Each isomer), methylpentylphenyl group (each isomer), diethylphenyl group (each isomer), ethylpropylphenyl group (each isomer), ethylbutylphenyl group (each isomer), dipropylphenyl group ( Each isomer), trimethylphenyl group (each isomer), triethylphenyl group (each isomer), naphthyl group (each isomer) and the like. Among these diaryl carbonates, R ¹ is, diaryl carbonate is preferably an aromatic hydrocarbon group having 6 to 8 carbon atoms, as such diaryl carbonate, diphenyl carbonate, di (methylphenyl) (including isomers ), Di (diethylphenyl) carbonate (each isomer), di (methylethylphenyl) carbonate (each isomer), and the like.
These diaryl carbonates contain metal atoms, preferably in the range of 0.001 ppm to 10%, more preferably in the range of 0.001 ppm to 5%, and still more preferably in the range of 0.002 ppm to 3%. Preferably it is. In addition, the metal atom may exist as a metal ion or may exist as a single metal atom. As the metal atom, a metal atom capable of taking a divalent to tetravalent valence is preferable, and one or more kinds of metals selected from iron, cobalt, nickel, zinc, tin, copper, and titanium are more preferable. The present inventors have surprisingly found that, when a diaryl carbonate containing a metal atom in a concentration within the above range is used, the reaction of diaryl carbonate and an amine compound suppresses the modification reaction of the generated aryl carbamate. I found out to play. Although it is not clear about the mechanism that exerts such an effect, the present inventors have coordinated these metal atoms to the urethane bond (-NHCOO-) of the carbamate produced in the reaction, and the urethane bond. It is speculated that this may be to suppress side reactions such as those represented by the above formulas (4) and (8). In addition, the effect of suppressing the modification reaction of aryl carbamate by metal atoms is also observed in the transfer of the reaction liquid containing aryl carbamate, which will be described later, but the mechanism is also assumed to be the same as above. Yes.
It is expected that the same effect can be obtained by mixing a diaryl carbonate and an amine compound to produce a mixture, and adding the metal atoms exemplified above to the mixture within the above range. As a result of intensive studies, it has been found that the above-described effects are hardly obtained by simply adding a metal atom to a mixture of a diaryl carbonate and an amine compound. Although the reason for such a result is not clear, the present inventors have found that the metal atom contained in the diaryl carbonate is coordinated with the metal atom, whereas the diaryl carbonate is coordinated with the metal atom. Atom added to the mixture of amide and amine compound has a larger interaction between metal atom and amine compound than metal atom and diaryl carbonate interaction, so metal atom is strongly coordinated to amine compound However, it is presumed that this is because it is difficult to coordinate with the urethane bond of the produced aryl carbamate.
The carbonate ester in the present embodiment is preferably produced by the method described later. When the metal atom exemplified above is contained in the above preferred range in the diaryl carbonate produced by the method, The diaryl carbonate can be used as it is. When the amount of the metal atom contained in the diaryl carbonate is less than the above range, a separate metal atom is added, for example, as an organic acid salt such as acetate or naphthenate, chloride, or acetylacetone complex. be able to. If the amount is larger than the above range, the amount of the metal atom is reduced to the above range by, for example, solvent washing, purification by distillation, crystallization, removal by ion exchange resin, removal by chelate resin, etc. Can be used.
The metal atom contained in the diaryl carbonate in the above range is almost always free of catalytic action in the reaction between the diaryl carbonate and the amine compound, and in that sense, for the production of aryl carbamate described later. It is clearly distinguished from the catalyst.
The amount of the metal component contained in the diaryl carbonate can be quantified by a known method, for example, atomic absorption spectrometry, inductively coupled plasma emission spectrometry, inductively coupled plasma mass spectrometry, fluorescent X-ray analysis The method can be selected from various methods such as X-ray photoelectron spectroscopy, electron beam microanalyzer, and secondary ion mass spectrometry in consideration of the form of the sample and the amount of the metal component contained.

As a method for producing diaryl carbonate, a known method can be used. Preferably, a carbonic acid ester is produced by reacting an organic tin compound having a tin-oxygen-carbon bond with carbon dioxide, and the carbonic acid ester and aroma are mixed. A process for producing diaryl carbonates from group hydroxy compounds is used. That is, the carbonate ester can be produced by the following steps.
Step (1): (Dialkyl carbonate production step) A step of reacting an organic tin compound having a tin-oxygen-carbon bond with carbon dioxide to obtain a reaction mixture containing dialkyl carbonate,
Step (2): (Dialkyl carbonate separation step) Step of separating the dialkyl carbonate from the reaction mixture and obtaining a residual liquid,
Step (3): (Diaryl carbonate production step) A step of reacting the dialkyl carbonate separated in the step (2) with the aromatic hydroxy compound A to obtain a diaryl carbonate and recovering by-produced alcohol.
In addition to these steps (1) to (3), the following steps (4) and (5) can also be performed.
Step (4): (Organic tin compound regeneration step) The residual liquid obtained in step (B) is reacted with alcohol to form an organic tin compound having a tin-oxygen-carbon bond and water, and the water. Removing from the reaction system,
Step (5): (Recycling step) The organotin compound having a tin-oxygen-carbon bond obtained in step (4) is reused as the organotin compound having a tin-oxygen-carbon bond in step (1). Process.

As the organotin compound used in step (1), a dialkyltin compound is preferably used. A dialkyl tin compound refers to an organotin compound in which two alkyl groups are bonded to one tin atom.
Examples of the dialkyltin compound include at least one compound selected from the group consisting of a dialkyltin compound represented by the following formula (14) and a tetraalkyldistanoxane compound represented by the following formula (15). Examples include selected compounds.

(Where:
R ³ and R ⁴ each independently represents a linear or branched alkyl group having 1 to 12 carbon atoms;
X ¹ and X ² each independently represent at least one substituent selected from the group consisting of an alkoxy group, an acyloxyl group, and a halogen atom;
a and b are each an integer of 0 to 2 and a + b = 2;
c and d are each an integer of 0 to 2, and c + d = 2. )

(Where:
R ⁵ , R ⁶ , R ⁷ and R ⁸ each independently represents a linear or branched alkyl group having 1 to 12 carbon atoms;
X ³ and X ⁴ represent at least one substituent selected from the group consisting of an alkoxy group, an acyloxyl group, and a halogen atom;
e, f, g, and h are each an integer of 0 to 2, and e + f = 2 and g + h = 2. )
Examples of R ³ and R ⁴ of the dialkyl tin catalyst represented by the above formula (14), and R ⁵ , R ⁶ , R ⁷ and R ⁸ of the tetraalkyl distannoxane compound represented by the above formula (15) As methyl, ethyl, propyl (each isomer), butyl (each isomer), pentyl (each isomer), hexyl (each isomer), heptyl (each isomer), octyl (each isomer), nonyl (Each isomer), decyl (each isomer), dodecyl (each isomer), and the like are aliphatic hydrocarbon groups in which the number of carbon atoms constituting the group is a number selected from an integer of 1 to 12. An alkyl group etc. are mentioned. More preferably, it is a linear or branched alkyl group in which the number of carbon atoms constituting the group is a number selected from an integer of 1 to 8, and the number of carbon atoms constituting the group is more than Although dialkyltin compounds having an alkyl group outside the indicated range can be used, fluidity may be deteriorated or productivity may be impaired. Furthermore, n-butyl group and n-octyl group are more preferable in consideration of availability at the time of industrial production.

X ¹ and X ² of the dialkyltin compound represented by the above formula (14) and X ³ and X ⁴ of the tetraalkyldistanoxane compound represented by the formula (15) are an alkoxy group or an acyloxyl group. And at least one substituent selected from the group consisting of halogen atoms, and when the group is an alkoxy group and / or an acyloxy group, the number of carbon atoms constituting the group is 0-12. It is preferably a group that is a number selected from the integers. Examples include methoxy group, ethoxy group, propoxy group (each isomer), butoxy group (each isomer), pentyloxy group (each isomer), hexyloxy group (each isomer), heptyloxy group (Each isomer), octyloxy group (each isomer), nonyloxy group (each isomer), decyloxy group (each isomer), etc., composed of linear or branched saturated alkyl groups and oxygen atoms An acyloxyl group composed of a linear or branched saturated alkyl group, a carbonyl group, and an oxygen atom, such as an alkoxy group, acetoxy group, propionyloxy group, butyryloxy group, valeryloxy group, lauroyloxy group, chloro group And a halogen atom such as a bromo group. In view of fluidity and solubility, and considering use as a carbonate production catalyst, a more preferred example is an alkoxy group having 4 to 6 carbon atoms.

  Examples of the dialkyltin compound represented by the formula (14) include dimethyl-dimethoxytin, dimethyl-diethoxytin, dimethyl-dipropoxytin (each isomer), dimethyl-dibutoxytin (each isomer), dimethyl-dipentyloxytin ( Each isomer), dimethyl-dihexyloxytin (each isomer), dimethyl-diheptyloxytin (each isomer), dimethyl-dioctyloxytin (each isomer), dimethyl-dinonyloxytin (each isomer) , Dimethyl-didecyloxytin (each isomer), dibutyl-dimethoxytin (each isomer), dibutyl-diethoxytin (each isomer), dibutyl-dipropoxytin (each isomer), dibutyl-dibutyloxytin (each Isomers), dibutyl-dipentyloxytin (each isomer), dibutyl-dihexyl Xytin (each isomer), dibutyl-diheptyloxytin (each isomer), dibutyl-dioctyloxytin (each isomer), dibutyl-dinonyloxytin (each isomer), dibutyl-didecyloxytin (each Isomers), dioctyl-dimethoxytin (each isomer), dioctyl-diethoxytin (each isomer), dioctyl-dipropoxytin (each isomer), dioctyl-dibutyloxytin (each isomer), dioctyl-dipentyloxytin (Each isomer), dioctyl-dihexyloxytin (each isomer), dioctyl-diheptyloxytin (each isomer), dioctyl-dioctyloxytin (each isomer), dioctyl-dinonyloxytin (each isomer) ), Dialkyl-dialkoxytin such as dioctyl-didecyloxytin (each isomer), Methyl-diacetoxytin, dimethyl-dipropionyloxytin (each isomer), dimethyl-dibutyryloxytin (each isomer), dimethyl-valeryloxytin (each isomer), dimethyl-dilauryloxytin ( Each isomer), dibutyl-diacetoxytin (each isomer), dibutyl-dipropionyloxytin (each isomer), dibutyl-dibutyryloxytin (each isomer), dibutyl-divaleryloxytin (each isomer) ), Dibutyl-dilauryloxytin (each isomer), dioctyl-diacetoxytin (each isomer), dioctyl-dipropionyloxytin (each isomer), dioctyl-dibutyryloxytin (each isomer) , Dioctyl-valeryloxytin (each isomer), dioctyl-dilauryloxytin (each isomer), etc. Kill-diacyloxytin, dimethyl-dichlorotin, dimethyl-dibromotin, dibutyl-dichlorotin (each isomer), dibutyl-dibromotin (each isomer), dioctyl-dichlorotin (each isomer), dioctyl-dibromotin (each isomer), etc. Of dialkyl-tin dihalides.

Among these, dimethyl-dimethoxytin, dimethyl-diethoxytin, dimethyl-dipropoxytin (each isomer), dimethyl-dibutoxytin (each isomer), dimethyl-dipentyloxytin (each isomer), dimethyl-dihexyloxytin ( Each isomer), dimethyl-diheptyloxytin (each isomer), dimethyl-dioctyloxytin (each isomer), dimethyl-dinonyloxytin (each isomer), dimethyl-didecyloxytin (each isomer) ), Dibutyl-dimethoxytin (each isomer), dibutyl-diethoxytin (each isomer), dibutyl-dipropoxytin (each isomer), dibutyl-dibutyloxytin (each isomer), dibutyl-dipentyloxytin (each Isomers), dibutyl-dihexyloxytin (each isomer), dibutyl-dihe Tiloxytin (each isomer), dibutyl-dioctyloxytin (each isomer), dibutyl-dinonyloxytin (each isomer), dibutyl-didecyloxytin (each isomer), dioctyl-dimethoxytin (each isomer) ), Dioctyl-diethoxytin (each isomer), dioctyl-dipropoxytin (each isomer), dioctyl-dibutyloxytin (each isomer), dioctyl-dipentyloxytin (each isomer), dioctyl-dihexyloxytin ( Each isomer), dioctyl-diheptyloxytin (each isomer), dioctyl-dioctyloxytin (each isomer), dioctyl-dinonyloxytin (each isomer), dioctyl-didecyloxytin (each isomer) ) And other dialkyl tin dialkoxides are preferred, among which dibutyl-dipropoxy (Each isomer), dibutyl-dibutyloxytin (each isomer), dibutyl-dipentyloxytin (each isomer), dibutyl-dihexyloxytin (each isomer), dibutyl-diheptyloxytin (each isomer) ) Dioctyl-dipropoxytin (each isomer), Dioctyl-dibutoxytin (each isomer), Dioctyl-dipentyloxytin (each isomer), Dioctyl-dihexyloxytin (each isomer), Dioctyl-diheptyloxytin ( Dialkyl-dialkoxytin such as each isomer) is more preferable, and dibutyl-dibutyloxytin (each isomer), dibutyl-dipentyloxytin (each isomer), dibutyl-dihexyloxytin (each isomer), dibutyl- Diheptyloxytin (each isomer), dibutyl-dioctyloxytin (each isomer) ), Dioctyl-dibutyloxytin (each isomer), dioctyl-dipentyloxytin (each isomer), dioctyl-dihexyloxytin (each isomer), dioctyl-diheptyloxytin (each isomer), dioctyl- Dioctyloxytin (each isomer) is more preferable.
The dialkyltin compound represented by the above formula (14) has a monomer structure, but may be a multimeric structure or an aggregate.

Examples of the tetraalkyl dialkoxy distannoxane represented by the formula (15) include 1,1,3,3-tetramethyl-1,3-dimethoxy distannoxane, 1,1,3,3-tetra Methyl-1,3-diethoxydistanoxane, 1,1,3,3-tetramethyl-1,3-dipropoxydistanoxane (each isomer), 1,1,3,3-tetramethyl -1,3-dibutoxydistanoxane (each isomer), 1,1,3,3-tetramethyl-1,3-dipentyloxydistanoxane (each isomer), 1,1,3 3-tetramethyl-1,3-dihexyloxydistanoxane (each isomer), 1,1,3,3-tetramethyl-1,3-diheptyloxydistanoxane (each isomer), 1 , 1,3,3-Tetramethyl-1,3-dioctyl Xydistanoxane (each isomer), 1,1,3,3-tetramethyl-1,3-dinonyloxydistanoxane (each isomer), 1,1,3,3-tetramethyl- 1,3-didecyloxydistanoxane (each isomer), 1,1,3,3-tetrabutyl-1,3-dimethoxydistanoxane (each isomer), 1,1,3,3- Tetrabutyl-1,3-diethoxydistanoxane (each isomer), 1,1,3,3-tetrabutyl-1,3-dipropoxydistanoxane (each isomer), 1,1,3 3-tetrabutyl-1,3-dibutoxydistanoxane (each isomer), 1,1,3,3-tetrabutyl-1,3-dipentyloxydistanoxane (each isomer), 1,1, 3,3-tetrabutyl-1,3-dihexyloxydistanoxa (Each isomer), 1,1,3,3-tetrabutyl-1,3-diheptyloxydistanoxane (each isomer), 1,1,3,3-tetrabutyl-1,3-dioctyloxydi Stanoxane (each isomer), 1,1,3,3-tetrabutyl-1,3-dinonyloxydistanoxane (each isomer), 1,1,3,3-tetrabutyl-1,3- Didecyloxydistanoxane (each isomer), 1,1,3,3-tetraoctyl-1,3-dimethoxydistanoxane (each isomer), 1,1,3,3-tetraoctyl- 1,3-diethoxydistanoxane (each isomer), 1,1,3,3-tetraoctyl-1,3-dipropoxydistanoxane (each isomer), 1,1,3,3 -Tetraoctyl-1,3-dibutoxydistanoxane (each isomer) 1,1,3,3-tetraoctyl-1,3-dipentyloxydistanoxane (each isomer), 1,1,3,3-tetraoctyl-1,3-dihexyloxydistanoxane ( Each isomer), 1,1,3,3-tetraoctyl-1,3-diheptyloxy distannoxane (each isomer), 1,1,3,3-tetraoctyl-1,3-dioctyloxy Distanoxane (each isomer), 1,1,3,3-tetraoctyl-1,3-dinonyloxydistanoxane (each isomer), 1,1,3,3-tetraoctyl-1 1,1,3,3-tetraalkyl-1,3-dialkoxy-distanoxane such as 1,3-didecyloxydistanoxane (each isomer), 1,1,3,3-tetramethyl-1, 3-diacetoxy distannoxane, 1,1,3 3-tetramethyl-1,3-dipropionyloxydistanoxane (each isomer), 1,1,3,3-tetramethyl-1,3-dibutyryloxydistanoxane (each isomer), 1,1,3,3-tetramethyl-1,3-divalyloxydistanoxane (each isomer), 1,1,3,3-tetramethyl-1,3-dilaurolyloxydistane Oxan (each isomer), 1,1,3,3-tetrabutyl-1,3-diacetoxy distannoxane (each isomer), 1,1,3,3-tetrabutyl-1,3-dipropionyl Oxydistanoxane (each isomer), 1,1,3,3-tetrabutyl-1,3-dibutyryloxydistanoxane (each isomer), 1,1,3,3-tetrabutyl-1, 3-Givaleryloxydistanoxane (each isomer) 1,1,3,3-tetrabutyl-1,3-dilaurolyloxydistanoxane (each isomer), 1,1,3,3-tetraoctyl-1,3-diacetoxydistanoxane ( Each isomer), 1,1,3,3-tetraoctyl-1,3-dipropionyloxydistanoxane (each isomer), 1,1,3,3-tetraoctyl-1,3-dibutyryl Oxydistanoxane (each isomer), 1,1,3,3-tetraoctyl-1,3-divalyloxydistanoxane (each isomer), 1,1,3,3-tetraoctyl 1,1,3,3-dilauryloxydistanoxane (each isomer), 1,1,3,3-tetraalkyl-1,3-diacyloxydistanoxane, 1,1,3,3 -Tetramethyl-1,3-dichlorodistanoxane, 1,1, 3,3-tetramethyl-1,3-dibromodistanoxane, 1,1,3,3-tetrabutyl-1,3-dichlorodistanoxane (each isomer), 1,1,3,3- Tetrabutyl-1,3-dibromodistanoxane (each isomer), 1,1,3,3-tetraoctyl-1,3-dichlorodistanoxane (each isomer), 1,1,3,3 Examples include 1,1,3,3-tetraalkyl-1,3-dihalogenated distannoxane such as tetraoctyl-1,3-dibromodistannoxane (each isomer).
Among these, 1,1,3,3-tetramethyl-1,3-dimethoxydistanoxane, 1,1,3,3-tetramethyl-1,3-diethoxydistanoxane, 1,1 , 3,3-tetramethyl-1,3-dipropoxydistanoxane (each isomer), 1,1,3,3-tetramethyl-1,3-dibutoxydistanoxane (each isomer) 1,1,3,3-tetramethyl-1,3-dipentyloxydistanoxane (each isomer), 1,1,3,3-tetramethyl-1,3-dihexyloxydistanoxane ( Each isomer), 1,1,3,3-tetramethyl-1,3-diheptyloxy distannoxane (each isomer), 1,1,3,3-tetramethyl-1,3-dioctyloxy Distannoxane (each isomer), 1,1,3,3-tetramethyl 1,3-dinonyloxydistanoxane (each isomer), 1,1,3,3-tetramethyl-1,3-didecyloxydistanoxane (each isomer), 1,1 , 3,3-tetrabutyl-1,3-dimethoxydistanoxane (each isomer), 1,1,3,3-tetrabutyl-1,3-diethoxydistanoxane (each isomer), 1, 1,3,3-tetrabutyl-1,3-dipropoxydistanoxane (each isomer), 1,1,3,3-tetrabutyl-1,3-dibutoxydistanoxane (each isomer), 1,1,3,3-tetrabutyl-1,3-dipentyloxydistanoxane (each isomer), 1,1,3,3-tetrabutyl-1,3-dihexyloxydistanoxane (each isomer) ), 1,1,3,3-tetrabutyl-1,3-dihept Ruoxydistanoxane (each isomer), 1,1,3,3-tetrabutyl-1,3-dioctyloxydistanoxane (each isomer), 1,1,3,3-tetrabutyl-1, 3-dinonyloxy distannoxane (each isomer), 1,1,3,3-tetrabutyl-1,3-didecyloxy distann oxane (each isomer), 1,1,3,3- Tetraoctyl-1,3-dimethoxydistanoxane (each isomer), 1,1,3,3-tetraoctyl-1,3-diethoxydistanoxane (each isomer), 1,1,3 1,3-tetraoctyl-1,3-dipropoxydistanoxane (each isomer), 1,1,3,3-tetraoctyl-1,3-dibutoxydistanoxane (each isomer), 1 , 1,3,3-Tetraoctyl-1,3-dipentyloxydi Stan oxane (each isomer), 1,1,3,3-tetraoctyl-1,3-dihexyloxydistan oxane (each isomer), 1,1,3,3-tetraoctyl-1,3-di Heptyloxydistanoxane (each isomer), 1,1,3,3-tetraoctyl-1,3-dioctyloxydistanoxane (each isomer), 1,1,3,3-tetraoctyl- 1,1,3, such as 1,3-dinonyloxydistanoxane (each isomer), 1,1,3,3-tetraoctyl-1,3-didecyloxydistanoxane (each isomer) 3,3-tetraalkyl-1,3-dialkoxy-distanoxane is more preferable, among which 1,1,3,3-tetrabutyl-1,3-dibutoxydistanoxane (each isomer), 1,1, 3,3-tetrabutyl-1,3-di Nyloxydistanoxane (each isomer), 1,1,3,3-tetrabutyl-1,3-dihexyloxydistanoxane (each isomer), 1,1,3,3-tetrabutyl-1 , 3-Diheptyloxydistanoxane (each isomer), 1,1,3,3-tetrabutyl-1,3-dioctyloxydistanoxane (each isomer), 1,1,3,3- Tetraoctyl-1,3-dibutoxydistanoxane (each isomer), 1,1,3,3-tetraoctyl-1,3-dipentyloxydistanoxane (each isomer), 1,1, 3,3-tetraoctyl-1,3-dihexyloxydistanoxane (each isomer), 1,1,3,3-tetraoctyl-1,3-diheptyloxydistanoxane (each isomer) 1,1,3,3-tetraoctyl- , 3-di-octyloxy-di Stan oxane (isomers) is more preferable.
The tetraalkyl dialkoxy distannoxane represented by the above formula (15) has a monomer structure, but may be a multimeric structure or an aggregate.
In general, organotin compounds tend to have an associated structure. For example, dialkyltin dialkoxytin forms a dimer structure, and tetraalkyldialkoxydistanoxane forms a ladder structure in which two or three molecules are associated. Although it is known that it may exist, it is common for those skilled in the art to represent a compound in a monomer structure even when such an association state changes.
Moreover, the dialkyl tin compound shown above may be individual, or may be 2 or more types of mixtures.

  As a method for producing a dialkyl tin compound, a production method already disclosed (WO 2005/111409 etc.) can be preferably used. This step is a step of producing a dialkyltin compound from dialkyltin oxide and alcohol.

  As alcohol used in the present embodiment, methanol, ethanol, propanol (each isomer), butanol (each isomer), pentanol (each isomer), hexanol (each isomer), heptanol (each isomer), Alcohols such as octanol (each isomer), nonanol (each isomer), decanol (each isomer), etc., wherein the number of carbon atoms constituting the alcohol is a number selected from an integer of 1 to 12 Preferably used.

  The dialkyltin oxide used in the alkyltin alkoxide synthesis step is a dialkyltin oxide represented by the following formula (16).

(Where:
R ⁹ and R ¹⁰ each independently represents a linear or branched alkyl group having 1 to 12 carbon atoms. )

Examples of R ⁹ and R ¹⁰ include methyl, ethyl, propyl (each isomer), butyl (each isomer), pentyl (each isomer), hexyl (each isomer), heptyl (each isomer), octyl (Each isomer), nonyl (each isomer), decyl (each isomer), undecyl (each isomer), alkyl group which is an aliphatic hydrocarbon group having 1 to 12 carbon atoms, such as dodecyl (each isomer) Etc. A linear or branched saturated alkyl group having 1 to 8 carbon atoms is more preferable, and an n-butyl group and an n-octyl group are more preferable.

A tetraalkyl dialkoxy distannoxane and / or a dialkyl tin dialkoxide is obtained while dehydrating the alcohol and the dialkyl tin oxide to remove the generated water from the system. The temperature at which the reaction is carried out is, for example, in the range of 80 to 180 ° C., and depends on the reaction pressure in order to distill and remove the water generated outside the system, but is preferably 100 ° C. to 180 ° C. In order to increase, the reaction temperature is preferably a high temperature, but on the other hand, an unfavorable reaction such as decomposition may occur at a high temperature, and the yield may be lowered, and more preferably in the range of 100 ° C to 160 ° C. is there. The pressure of the reaction is a pressure at which generated water can be removed out of the system, and depending on the reaction temperature, the reaction is performed at 20 to 1 × 10 ⁶ Pa. There is no restriction | limiting in particular in the reaction time of a dehydration reaction, Usually, 0.001 to 50 hours, Preferably it is 0.01 to 10 hours, More preferably, it is 0.1 to 2 hours. The reaction may be terminated once the desired alkyltin alkoxide composition is obtained. The progress of the reaction can also be determined by measuring the amount of water withdrawn out of the system, or it can be determined by sampling the reaction solution and using ¹¹⁹ Sn-NMR. In order to produce the mixture of the present embodiment in step (1), the molar ratio of tetraalkyl dialkoxy distannoxane and dialkyl tin dialkoxide contained in the alkyl tin alkoxide composition obtained by the above reaction is It was confirmed that a composition in the range of 0: 100 to 80:20, more preferably a composition in the range of 10:90 to 70:30, was obtained by expressing both in mol%. To complete the reaction. The alcohol used may be used as it is, or in some cases, the alcohol may be distilled off and used. Since there exists an advantage which can make the reactor of another process small, it is preferable to remove alcohol as much as possible. The removal method is preferably removal by a known distillation, and the distillation apparatus used for the distillation can be a known distillation facility. As a preferable distillation apparatus, a thin film distillation apparatus can be preferably used because it can be removed in a short time. There is no particular limitation on the type of the reactor for the dehydration reaction, and a known tank or tower reactor can be used. The low boiling point reaction mixture containing water may be extracted from the reactor in a gaseous state by distillation, and the high boiling point reaction mixture containing the alkyltin alkoxide or alkyltin alkoxide mixture to be produced may be extracted in liquid form from the lower part of the reactor. As such a reactor, for example, a stirring tank, a multistage stirring tank, a distillation tower, a multistage distillation tower, a multitubular reactor, a continuous multistage distillation tower, a packed tower, a thin film evaporator, a reactor equipped with a support inside, Various known methods such as a method using a forced circulation reactor, a falling film evaporator, a drop evaporator, a trickle phase reactor, a reactor including a bubble column, and a combination of these may be used. In terms of efficiently shifting the equilibrium to the production system side, a method using a tower-like reactor is preferable, and a structure having a large gas-liquid contact area that can quickly move the water formed to the gas phase is preferable. Although a continuous method using a multitubular reactor, a multistage distillation column, or a packed column packed with a filler can also be used, the dialkyltin oxide used in this step is usually in a solid state. A method of carrying out and then increasing the content of dialkyltin dialkoxide in a column reactor is most preferred. The material of the reactor and line may be any known material as long as it does not have an adverse effect, but SUS304, SUS316, SUS316L, etc. are inexpensive and can be preferably used. If necessary, instrumentation equipment such as flow meters and thermometers, and known process equipment such as reboilers, pumps, condensers, etc. may be added. A known method such as cooling water or brine can be used.

Step (1) is a step of producing a carbonate ester by reacting the dialkyltin compound produced by the above-described method with gaseous carbon dioxide. In this step, the already disclosed methods for producing carbonate esters (WO03 / 055840, WO04 / 014840, etc.) are preferably used.
The alkyltin compound supplied to this process is supplied from the alkyltin alkoxide synthesis process at the time of start-up and from the dialkyltin compound manufacturing process of the process (4) described later through the process (5) at the time of continuous production. There is a case.

In step (1), first, the dialkyltin alkoxide and gaseous carbon dioxide are absorbed and chemically reacted to obtain a mixture containing a carbon dioxide conjugate of dialkyltin alkoxide. In the case of chemical reaction, the dialkyltin alkoxide is reacted as a liquid. In order to make the dialkyltin alkoxide liquid when the dialkyltin alkoxide is solid, a method of making it liquid by heating can be preferably used. Alternatively, it may be liquid with a solvent or the like. The reaction pressure depends on the reaction temperature, but is preferably in the range of normal pressure to 1 MPa, and more preferably in the range of normal pressure to 0.6 MPa. The reaction temperature depends on the reaction pressure, but is preferably in the range of −40 ° C. to 80 ° C. Considering the fluidity during transfer, 0 ° C. to 80 ° C. is more preferred, and the most preferred range is room temperature ( For example, it is 20 degreeC) -80 degreeC. The reaction time may be carried out in the range of several seconds to 100 hours. In consideration of productivity and the like, several minutes to 10 hours are preferable. As the reactor, a known tank reactor or column reactor can be used. A plurality of reactors may be used in combination. Since the reaction is a reaction between carbon dioxide gas (gas) and an alkyl tin alkoxide composition (liquid), it is preferable to increase the gas-liquid interface to increase the contact area between the gas and the liquid in order to efficiently perform the reaction. . Known knowledge can be used for such a reaction method by enlarging the gas-liquid interface. For example, in a tank reactor, a method of increasing the stirring speed or generating bubbles in the liquid is preferable. In the reactor, a method using a packed tower or a plate tower is preferable. Examples of such tower-type reactors include, for example, those of a tray tower type using trays such as foam trays, perforated plate trays, valve trays, countercurrent trays, Raschig rings, Lessing rings, pole rings, Berle saddles. A packed tower type packed with various packing materials such as interlock saddle, Dixon packing, McMahon packing, helipak, sulzer packing, and melapack can be used. The material of the reactor and the line may be any known material as long as it does not have an adverse effect, but SUS304, SUS316, SUS316L, etc. are inexpensive and can be preferably used. If necessary, instrumentation equipment such as flow meters and thermometers, and known process equipment such as reboilers, pumps, condensers, etc. may be added. A known method such as cooling water or brine can be used. Since the reaction is usually an exothermic reaction, it may be cooled, or it may be cooled by heat release from the reactor. Alternatively, heating may be performed for the purpose of simultaneously causing the carbonic esterification reaction. For the cooling and heating of the reactor, known methods such as a method using a jacket and a method using an internal coil can be used. The carbon dioxide gas and alkyltin alkoxide composition supplied to the reactor may be supplied separately to the reactor or may be mixed before being supplied to the reactor. You may supply from several places of a reactor. The completion of the reaction can be determined by, for example, ¹¹⁹ Sn-NMR analysis.

Next, from the carbon dioxide conjugate of dialkyltin alkoxide obtained above, a reaction solution containing a carbonate is obtained by the following method.
The reaction conditions are in the range of 110 ° C. to 200 ° C., and the reaction temperature is preferably high in order to increase the reaction rate. On the other hand, undesired reactions such as decomposition may occur at high temperatures, resulting in a decrease in yield. Therefore, it is preferably in the range of 120 ° C. to 180 ° C., in the range of 0.1 hour to 10 hours, and the reaction pressure is in the range of 1.5 MPa to 20 MPa, preferably 2.0 MPa to 10 MPa. The reaction may be completed after the desired carbonate ester is formed in the reactor. The progress of the reaction can be confirmed by sampling the reaction solution in the reactor and analyzing the carbonate produced by a method such as ¹ H-NMR or gas chromatography. For example, the reaction is completed when 10% or more of dialkyltin alkoxide and / or dialkyltin alkoxide and carbon dioxide conjugate of dialkyltin alkoxide contained in the carbon dioxide conjugate of dialkyltin alkoxide is produced. In order to increase the yield of carbonate ester, the reaction is continued until the value reaches 90% or more, and then the reaction is terminated. A known reactor can be used as the reactor, and both a tower reactor and a tank reactor can be preferably used. The material of the reactor and the line may be any known material as long as it does not have an adverse effect, but SUS304, SUS316, SUS316L, etc. are inexpensive and can be preferably used. If necessary, instrumentation equipment such as flow meters and thermometers, and known process equipment such as reboilers, pumps, condensers, etc. may be added. A known method such as cooling water or brine can be used.

Step (2) in the present embodiment is a step of separating and recovering the carbonate ester from the reaction solution containing the carbonate ester obtained in the above-described step (1) and obtaining a residual solution. A known method or apparatus can be preferably used as the separation method. A preferred method is by distillation.
The reaction liquid transferred from the above-mentioned step (1) is batch or semi-batch or continuously distilled to obtain a carbonate ester and a residual liquid. A preferred distillation method is a method in which the reaction solution is supplied to a distiller, carbonate ester is separated as a gas phase component from the upper part of the distiller, and the residual liquid is extracted as a liquid component from the bottom of the distiller. Although the temperature in this step depends on the boiling point and pressure of the carbonate ester, it may be in the range of room temperature (for example, 20 ° C.) to 200 ° C. If the tin compound in the residual liquid is modified at a high temperature, or the carbonate ester is reversed. Since it may decrease by reaction, the range of normal temperature (for example, 20 ° C.) to 150 ° C. is preferable. Although the pressure depends on the type of carbonate ester and the temperature at which it is carried out, it is usually carried out under normal pressure to a reduced pressure condition, and considering the productivity, the range of 100 Pa to 80 KPa is more preferred, and 100 Pa to 50 KPa is the most preferred range. is there. The time can be carried out in the range of 0.01 hours to 10 hours, and if carried out at a high temperature for a long time, the tin compound contained in the reaction solution may be modified or the carbonate ester may be reduced by a reverse reaction. A range of 0.01 hours to 0.5 hours is preferred, and a range of 0.01 hours to 0.3 hours is most preferred. A known distiller can be used as the distiller, and a column-type distiller and a tank-type distiller can be preferably used, or a plurality of distillers may be used in combination. More preferable distillers are a thin film evaporator and a thin film distiller, and a thin film evaporator equipped with a distillation column and a thin film distiller are most preferable. The material of the distiller and the line may be any known material as long as it does not have an adverse effect, but SUS304, SUS316, SUS316L, etc. are inexpensive and can be preferably used. If necessary, instrumentation equipment such as flow meters and thermometers, and known process equipment such as reboilers, pumps, condensers, etc. may be added. A known method such as cooling water or brine can be used.

Step (3) is a step of reacting the dialkyl carbonate separated in step (2) with the aromatic hydroxy compound A to obtain a diaryl carbonate and recovering the by-produced alcohol. Here, the aromatic hydroxy compound is a group R ¹ O constituting the diaryl carbonate represented by the above formula (1) (R ¹ is an aromatic group as defined above, and O represents an oxygen atom). This is a compound corresponding to the compound R ¹ OH in which a hydrogen atom is added. Specifically, examples of the aromatic hydroxy compound A preferably used include phenol, methylphenol (each isomer), ethylphenol (each isomer), propylphenol (each isomer), and butylphenol (each isomer). , Monosubstituted phenols such as pentylphenol (each isomer), hexylphenol (each isomer), dimethylphenol (each isomer), diethylphenol (each isomer), dipropylphenol (each isomer), methylethyl Phenol (each isomer), methylpropylphenol (each isomer), methylbutylphenol (each isomer), methylpentylphenol (each isomer), ethylpropylphenol (each isomer), ethylbutylphenol (each isomer), etc. Disubstituted phenols, trimethylphenol (each isomer), List tri-substituted phenols such as ethylphenol (each isomer), dimethylethylphenol (each isomer), dimethylpropylphenol (each isomer), dimethylbutylphenol (each isomer), naphthol (each isomer), etc. Can do.
Step (3) in the present embodiment is a step of obtaining a diaryl carbonate by reacting the component mainly containing a carbonate separated in step (2) with the aromatic hydroxy compound A. There have been many proposals for obtaining alkylaryl carbonates and diaryl carbonates from dialkyl carbonates and aromatic hydroxy compounds, and these techniques can also be preferably applied to this embodiment.
The reaction in the step (3) includes a transesterification reaction between a carbonate ester and an aromatic hydroxy compound and a disproportionation reaction of a dialkylaryl carbonate obtained by the transesterification reaction.

The transesterification reaction is an equilibrium reaction, and if the reaction is to proceed advantageously, it is preferable to carry out the reaction while extracting the alcohol produced by the transesterification reaction. In this case, the transesterification reaction is used in step (3). It is preferable that the boiling point of the aromatic hydroxy compound is higher than the boiling point of the alkyl alcohol constituting the alkyl carbonate obtained in the step (2). In particular, when the steps (1) to (3) are repeated continuously one or more times, the boiling point of the alkyl alcohol is preferably lower than the normal boiling point of the aromatic hydroxy compound, and the difference in boiling points is The temperature is preferably 2 ° C, and more preferably 10 ° C in view of ease of separation.
Examples of the dialkyl carbonate used in the step (3) include, for example, dimethyl carbonate, diethyl carbonate, dipropyl carbonate (each isomer), dibutyl carbonate (each isomer), dipentyl carbonate (each isomer), dihexyl carbonate (each Isomers), diheptyl carbonate (each isomer), dioctyl carbonate (each isomer), dinonyl carbonate (each isomer), didecyl carbonate (each isomer), dicyclopentyl carbonate, dicyclohexyl carbonate, dicycloheptyl carbonate (each isomer) ), Dibenzyl carbonate, diphenethyl carbonate (each isomer), di (phenylpropyl) carbonate (each isomer), di (phenylbutyl) carbonate (each isomer), di (chlorobenzyl) carbonate (each isomer), Di (methoxybenzyl) carbonate (each isomer), di (methoxymethyl) carbonate, di (methoxyethyl) carbonate (each isomer), di (chloroethyl) carbonate ) (Each isomer), di (cyanoethyl) carbonate (each isomer), methyl ethyl carbonate, methyl propyl carbonate (each isomer), methyl butyl carbonate (each isomer), ethyl propyl carbonate (each isomer), ethyl butyl carbonate (Each isomer), ethylene carbonate, propylene carbonate, etc. are used. The carbonic acid ester used may be one kind or a mixture.
Among these dialkyl carbonates, an alcohol preferably used in the present embodiment is an alcohol having a normal boiling point of alcohol constituting the carbonate ester higher than the normal boiling point of water, and is an alkyl having 4 to 12 carbon atoms. Group-containing alkyl alcohol, linear or branched alkenyl alcohol having 4 to 12 carbon atoms, cycloalkyl alcohol, and aralkyl alcohol. In consideration of removing the alcohol generated in the reaction of the step (3) in order to favorably advance the reaction performed in the step (3), the standard boiling point of the aromatic hydroxy compound used in the step (3) An alcohol having a low standard boiling point is more preferable. That is, dialkyl carbonate composed of an alcohol having a standard boiling point higher than that of water and a standard boiling point lower than that of the aromatic hydroxy compound is preferable.
The amount of the aromatic hydroxy compound used in step (3) is 0.1 to 10,000 in terms of a stoichiometric ratio with respect to the amount of dialkyl carbonate used in step (3), separated in step (2). Can be used in double range. Since the reaction in the step (3) is mainly an equilibrium reaction, it is advantageous that the amount of the aromatic hydroxy compound is large. However, if the amount used is increased, the reactor becomes larger, and the subsequent product is not dispersed. Since a large distillation column or the like is required, the range is preferably 1 to 1000 times, more preferably 1 to 100 times that of dialkyl carbonate.
The compound supplied to the step (3) is mainly a dialkyl carbonate, an aromatic hydroxy compound, and if necessary, a catalyst, but impurities that do not particularly adversely influence the reaction may be mixed.
These feedstocks may contain the products alcohol, alkylaryl carbonate, diaryl carbonate, etc., but this reaction is a reversible reaction, so if the concentration of these products is too high Is not preferable because it reduces the reaction rate of the raw material. The amount ratio of the dialkyl carbonate to be fed and the aromatic hydroxy compound may vary depending on the type and amount of the catalyst and the reaction conditions. It is preferable to supply in the range of 0.01 to 1000 times.
The reaction time in the transesterification reaction in step (3) varies depending on the reaction conditions, the type of reactor and the internal structure, but is usually 0.001 to 50 hours, preferably 0.01 to 10 hours, more preferably. 0.05 to 5 hours. The reaction temperature is the temperature in the reactor, and varies depending on the type of dialkyl carbonate and aromatic hydroxy compound used as starting compounds, but is usually 50 ° C to 350 ° C, preferably 100 ° C to 280 ° C. It is. The reaction pressure varies depending on the type of raw material compound used, the reaction temperature, and the like, but may be any of reduced pressure, normal pressure, and increased pressure, and is usually in the range of 10 Pa to 20 MPa.
In the present embodiment, it is not always necessary to use a solvent, but for the purpose of facilitating the reaction operation, an appropriate inert solvent such as ethers, aliphatic hydrocarbons, aromatic hydrocarbons, Halogenated aliphatic hydrocarbons, halogenated aromatic hydrocarbons, and the like can be used as the reaction solvent. In addition, an inert gas such as nitrogen, helium or argon may be present in the reaction system as a substance inert to the reaction. The inert gas or the low-melting-point organic compound that is inert to the reaction may be introduced in the form of a gas from the lower part.

In carrying out the transesterification reaction in step (3), a catalyst may be added. As described above, an alkylaryl carbonate and a diaryl carbonate are obtained from a carbonate ester by transesterification. The transesterification reaction is slow in addition to the fact that the equilibrium is biased toward the original system. In the production of diaryl, several proposals have been made to improve these, and known methods can be preferably used in this embodiment.
The amount of catalyst used in the present embodiment depends on the type of catalyst used, the type of reactor, the type of carbonic acid ester and the aromatic hydroxy compound and the amount ratio, reaction temperature, reaction pressure, and other reaction conditions. Although it is different, it is usually used at 0.0001 to 50% by weight, expressed as a ratio to the total weight of the carbonate ester and aromatic hydroxy compound as the feedstock. Moreover, when using a solid catalyst, the catalyst amount of 0.01-75 volume% is preferably used with respect to the empty space of a reactor.
A number of metal-containing catalysts are known as proposals for catalysts for increasing the reaction rate. A known transesterification catalyst can also be used in this embodiment. In the method for producing an alkylaryl carbonate and / or a mixture containing an alkylaryl carbonate and a diaryl carbonate by reacting a carbonic acid ester with an aromatic hydroxy compound, such a catalyst includes, for example, a Lewis acid or Lewis acid such as a transition metal halide. Compounds for purifying acids, tin compounds such as organotin alkoxides and organotin oxides, alkali metal or alkaline earth metal salts and alkoxides, lead compounds, copper, iron, zirconium and other metal complexes, titanates Further, a mixture of Lewis acid and proton acid, compounds such as Sc, Mo, Mn, Bi, Te, ferric acetate, etc. have been proposed. Although the formation of diaryl carbonate can occur only by transesterification reaction, it can also be generated by disproportionation reaction of alkylaryl carbonate produced by transesterification reaction. The disproportionation reaction here is a reaction in which dialkyl carbonate and diaryl carbonate are produced from two molecules of alkyl aryl carbonate. The reaction of alkylaryl carbonate further reacts with an aromatic hydroxy compound to form diaryl carbonate, but the disproportionation reaction is faster, so when diaryl carbonate is desired, the alkylaryl carbonate is disproportionated. To obtain a diaryl carbonate. Both reactions are equilibrium reactions. In the transesterification reaction for producing an alkylaryl carbonate, it is advantageous to carry out the reaction while extracting the alkyl alcohol, and in the disproportionation step, the reaction is carried out while extracting the dialkyl carbonate. Therefore, preferable reaction conditions are different in each stage. When the reaction is continuously carried out, it is necessary to carry out the reaction in two stages. However, when the reaction is carried out batchwise, it can also be carried out sequentially in the same reactor.
Therefore, a catalyst for catalyzing the disproportionation reaction may be present together with the above-described transesterification catalyst. Many examples of such catalysts have also been proposed. Such catalysts include, for example, Lewis acids and transition metal compounds capable of generating Lewis acids, polymeric tin compounds, general formula R—X (═O) OH, wherein X is selected from Sn and Ti, R is selected from monovalent hydrocarbon groups), a mixture of Lewis acid and protonic acid, lead catalyst, titanium, zirconium compound, tin compound, Sc, Mo, Mn, Bi, Te, etc. Etc. have been proposed.

The disproportionation step is a step of disproportionating the alkylaryl carbonate obtained in the transesterification step to obtain dialkyl carbonate and diaryl carbonate. As described above, a transproportionation catalyst may be added during the transesterification reaction, and the transesterification reaction and the disproportionation reaction may be performed simultaneously, or the transesterification reaction and the disproportionation reaction may be performed separately. It may be carried out continuously or batchwise. Also, transesterification reaction and disproportionation reaction may be carried out separately to obtain diaryl carbonate at the same time as alkyl aryl carbonate. In this case, disproportionation reaction can be carried out as it is. . As shown above, the disproportionation reaction is a process for obtaining an alkyl aryl carbonate by transesterification of a dialkyl carbonate and an aromatic hydroxy compound. In order to advantageously proceed with this equilibrium reaction, the alcohol is extracted. However, the method of proceeding the reaction is advantageous. Since the disproportionation reaction is also restricted by the equilibrium, if it is to proceed advantageously, a method in which one of the dialkyl carbonate and diaryl carbonate produced by the disproportionation reaction is taken out from the system is advantageous. . In the present embodiment, among the products, each alkoxy group and aryl group are selected so that dialkyl carbonate has a lower boiling point than diaryl carbonate, and the disproportionation reaction is performed while extracting dialkyl carbonate out of the system. It is preferable to do this. The extracted dialkyl carbonate may be used after returning to the step before the disproportionation reaction. In order to increase the production amount of diaryl carbonate, it is preferable to use the extracted dialkyl carbonate by returning it to the transesterification step.
In the disproportionation step, one that catalyzes the disproportionation reaction may be used. Many examples of such catalysts have also been proposed. Such catalysts include, for example, Lewis acids and transition metal compounds capable of generating Lewis acids, polymeric tin compounds, general formula R—X (═O) OH, wherein X is selected from Sn and Ti, R is selected from monovalent hydrocarbon groups), a mixture of Lewis acid and protonic acid, lead catalyst, titanium, zirconium compound, tin compound, Sc, Mo, Mn, Bi, Te, etc. Etc. have been proposed.
As the disproportionation reaction catalyst in the present embodiment, the same catalyst as the transesterification reaction catalyst used in the transesterification step can be used.

The alkylaryl carbonate used in the disproportionation step is an alkylaryl carbonate ester. Examples of alkyl aryl carbonates include methyl phenyl carbonate, ethyl phenyl carbonate, propyl phenyl carbonate (each isomer), butyl phenyl carbonate (each isomer), allyl phenyl carbonate (each isomer), pentyl phenyl carbonate (each isomer) ), Hexyl phenyl carbonate (each isomer), heptyl phenyl carbonate (each isomer), octyl tol carbonate (each isomer), nonyl carbonate (ethyl phenyl) (each isomer), decyl carbonate (butyl phenyl) (each isomer) ), Methyl tolyl carbonate (each isomer), ethyl tolyl carbonate (each isomer), propyl tolyl carbonate (each isomer), butyl tolyl carbonate (each isomer), allyl tolyl carbonate (each isomer), methyl xylyl carbonate (each isomer) ), Methyl carbonate (trimethylphenyl) (each isomer), methyl carbonate (chlorophenyl) (each isomer), carbonic acid Cyl (nitrophenyl) (each isomer), methyl carbonate (methoxyphenyl) (each isomer), methyl carbonate (pyridyl) (each isomer), ethyl cumyl carbonate (each isomer), methyl carbonate (benzoylphenyl) (each Isomers), ethyl xylyl carbonate (each isomer), benzyl xylyl carbonate (each isomer), and the like. These alkylaryl carbonates may be one kind or a mixture of two or more kinds.
Among these alkylaryl carbonates, the alcohol that constitutes the alkylaryl carbonate is preferably an alcohol having a boiling point higher than that of water, and the boiling point of the alcohol that constitutes the alkylaryl carbonate is preferably used in the present embodiment. , Lower than the boiling point of the aromatic hydroxy compound constituting the alkyl aryl carbonate, for example, a linear or branched alkyl alcohol having 4 to 12 carbon atoms, a linear or branched carbon nest 4 In view of removing dialkyl carbonate produced by the disproportionation reaction in order to favorably proceed the disproportionation reaction, selected from alkenyl alcohols having alkenyl groups of -12, cycloalkyl alcohols, and aralkyl alcohols. , Dialkyl carbonate having a lower boiling point than diaryl carbonate obtained by disproportionation reaction Rukoto is preferable. Examples of such an optimal combination include alcohol, alcohol corresponding to an alkoxy group of a metal compound having a metal-carbon-oxygen bond represented by the above formula (14) and formula (15), and alcohol constituting a dialkyl carbonate. , Pentanol (each isomer), hexanol (each isomer), alcohol selected from the group of heptanol (each isomer), and the aromatic hydroxy compound is an aromatic hydroxy compound selected from phenol and cresol .
The compound supplied to the disproportionation step is mainly alkylaryl carbonate, and if necessary, is a catalyst, but impurities that do not particularly adversely affect the reaction may be mixed therein.
The amount of catalyst in the case of using a catalyst in the present embodiment varies depending on the type of catalyst used, the type of reactor, the type and amount of alkyl aryl carbonate, the reaction temperature and the reaction conditions such as the reaction pressure, etc. Expressed as a percentage of the weight of the alkyl aryl carbonate as a raw material, it is usually used in an amount of 0.0001 to 50% by weight. Moreover, when using a solid catalyst, the catalyst amount of 0.01-75 volume% is preferably used with respect to the empty space of a reactor.
These feedstocks may contain alcohols, aromatic hydroxy compounds, diaryl carbonates, etc., but since this reaction is a reversible reaction, if the concentration of these components is too high, Since the reaction rate of a raw material is reduced, it may not be preferable.
The reaction time of the disproportionation reaction varies depending on the reaction conditions, the type of reactor and the internal structure, but is usually 0.001 to 50 hours, preferably 0.01 to 10 hours, more preferably 0.05 to 5 hours. The reaction temperature varies depending on the type of alkylaryl carbonate used, but is usually 50 ° C to 350 ° C, more preferably 100 ° C to 280 ° C. The reaction pressure varies depending on the type of raw material compound used, the reaction temperature, and the like, but may be any of reduced pressure, normal pressure, and increased pressure, and is usually performed in the range of 10 Pa to 20 MPa.
In the disproportionation step in the present embodiment, it is not always necessary to use a solvent, but for the purpose of facilitating the reaction operation, an appropriate inert solvent such as ethers, aliphatic hydrocarbons, aromatics Group hydrocarbons, halogenated aliphatic hydrocarbons, halogenated aromatic hydrocarbons, and the like can be used as the reaction solvent. In addition, an inert gas such as nitrogen, helium or argon may coexist in the reaction system as a substance inert to the reaction, or continuous multistage distillation for the purpose of accelerating the distillation of low-boiling by-products to be generated. From the lower part of the tower, the inert gas or the low-melting-point organic compound inert to the reaction may be introduced in the form of gas.
After completion of the disproportionation reaction, the catalyst, alkylaryl carbonate, aromatic hydroxy compound and alcohol are separated by a known method to obtain diaryl carbonate.
The type of the reactor used in the transesterification step and the disproportionation step is not particularly limited, and there are various known types such as a stirring tank method, a multistage stirring tank method, a method using a multistage distillation column, and a method combining these. The method is used. These reactors can be used either batchwise or continuously. In terms of efficiently shifting the equilibrium to the production system side, a method using a multistage distillation column is preferred, and a continuous method using a multistage distillation column is particularly preferred. The multi-stage distillation column is a distillation column having a multi-stage of two or more theoretical distillation stages, and any column can be used as long as continuous distillation is possible. Examples of such a multi-stage distillation column include a tower column type using a tray such as a bubble bell tray, a perforated plate tray, a bubble tray, a counter-current tray, a Raschig ring, a lessing ring, a pole ring, a Berle saddle, an interface. Any one that is normally used as a multistage distillation column can be used, such as a packed column type packed with various packings such as Rox saddle, Dixon packing, McMahon packing, Helipak, Sulzer packing, Merapack, etc. . Furthermore, a shelf-packed mixing tower type having both a shelf portion and a portion filled with a packing is also preferably used. When carrying out a continuous process using a multistage distillation column, the starting material and the reactants are continuously fed into the continuous multistage distillation column, and in the presence of a metal-containing catalyst in the distillation column, The transesterification reaction and / or the disproportionation reaction between the two substances are performed in the liquid phase, and at the same time, the high-boiling reaction mixture containing the alkylaryl carbonate and / or diaryl carbonate to be produced is liquefied from the lower part of the distillation column. Diaryl carbonate is produced by withdrawing, while continuously withdrawing the low-boiling reaction mixture containing the by-products formed, from the top of the distillation column by distillation.

As mentioned above, although the manufacture example of the diaryl carbonate using a dialkyl tin compound was shown, in addition to the process (1)-process (3) mentioned above, the following processes (4) and processes (5) can be performed.
Step (4): A step of reacting the residual liquid obtained in Step (2) with alcohol to form an organotin compound having a tin-oxygen-carbon bond and water, and removing the water from the reaction system.
Step (5): A step of reusing the organotin compound having a tin-oxygen-carbon bond obtained in step (4) as the organotin compound having a tin-oxygen-carbon bond in step (1).

Step (4) is a step of regenerating the dialkyltin compound by reacting the residual liquid obtained in step (2) with alcohol.
As alcohol used in this step, methanol, ethanol, propanol (each isomer), butanol (each isomer), pentanol (each isomer), hexanol (each isomer), heptanol (each isomer), octanol ( Each isomer), nonanol (each isomer), decanol (each isomer), etc., which is an alcohol having the number of carbon atoms constituting the alcohol selected from an integer of 1 to 12 is preferably used. However, more preferably, the same alcohol as that used in the above alkyltin alkoxide synthesis step is used.
It is preferable to carry out the dehydration reaction under the same conditions as in the above-described alkyltin alkoxide synthesis step. The reaction may be terminated once the desired alkyltin alkoxide composition is obtained. The progress of the reaction can also be determined by measuring the amount of water withdrawn out of the system, or it can be determined by sampling the reaction solution and using ¹¹⁹ Sn-NMR. In order to produce the mixture of the present embodiment in step (1), the molar ratio of tetraalkyl dialkoxy distannoxane and dialkyl tin dialkoxide contained in the alkyl tin alkoxide composition obtained by the above reaction is It was confirmed that a composition in the range of 0: 100 to 80:20, more preferably a composition in the range of 10:90 to 70:30, was obtained by expressing both in mol%. To complete the reaction. The alcohol used may be used as it is, or in some cases, the alcohol may be distilled off and used. Since there exists an advantage which can make the reactor of another process small, it is preferable to remove alcohol as much as possible. The removal method is preferably removal by a known distillation, and the distillation apparatus used for the distillation can be a known distillation facility. As a preferable distillation apparatus, a thin film distillation apparatus can be preferably used because it can be removed in a short time. In this step, unlike the synthesis step of alkyl tin alkoxide, since dialkyl tin oxide, which is usually solid, is not used, there are few restrictions on the reactor. That is, the type of the reactor for the dehydration reaction is not particularly limited, and a known tank or tower reactor can be used. The low boiling point reaction mixture containing water may be extracted from the reactor in a gaseous state by distillation, and the high boiling point reaction mixture containing the alkyltin alkoxide or alkyltin alkoxide mixture to be produced may be extracted in liquid form from the lower part of the reactor. As such a reactor, for example, a stirring tank, a multistage stirring tank, a distillation tower, a multistage distillation tower, a multitubular reactor, a continuous multistage distillation tower, a packed tower, a thin film evaporator, a reactor equipped with a support inside, Various known methods such as a method using a forced circulation reactor, a falling film evaporator, a drop evaporator, a trickle phase reactor, a reactor including a bubble column, and a combination of these may be used. In view of efficiently shifting the equilibrium to the production system side, a method using a tower reactor is preferable, and a structure having a large gas-liquid contact area capable of promptly moving the formed water to the gas phase is preferable. A continuous method using a multitubular reactor, a multistage distillation column, and a packed column packed with a filler is particularly preferred. The material of the reactor and the line may be any known material as long as it does not have an adverse effect, but SUS304, SUS316, SUS316L, etc. are inexpensive and can be preferably used. If necessary, instrumentation equipment such as flow meters and thermometers, and known process equipment such as reboilers, pumps, condensers, etc. may be added. A known method such as cooling water or brine can be used.
The dialkyltin compound produced in the above step (4) is the next step (5) (recycling step), the organotin compound having a tin-oxygen-carbon bond obtained in step (4), By the step of reusing as an organotin compound having a tin-oxygen-carbon bond in step (1), it is reused as the dialkyltin compound used in step (1).

<Amine compound>
On the other hand, an amine compound represented by the following formula (17) is used as the amine compound used in the production method in the present embodiment.

(Wherein R ² is one group selected from the group consisting of an aliphatic group having 1 to 20 carbon atoms and an aromatic group having 6 to 20 carbon atoms, including an atom selected from carbon and oxygen, represents a group having a valence equal to n;
n is an integer of 2 to 10. )

In the above formula (17), a diamine compound in which n is preferably a polyamine having 2 or more, and more preferably n is 2 is used.
More preferably, R ² in the formula (17) includes an alkyl group having 1 to 20 carbon atoms and a cycloalkyl group having 5 to 20 carbon atoms. Examples of such R ² include methylene, dimethylene, Linear hydrocarbon groups such as trimethylene, tetramethylene, pentamethylene, hexamethylene, octamethylene; unsubstituted alicyclic hydrocarbon groups such as cyclopentane, cyclohexane, cycloheptane, cyclooctane, bis (cyclohexyl) alkane; methyl Cyclopentane, ethylcyclopentane, methylcyclohexane (each isomer), ethylcyclohexane (each isomer), propylcyclohexane (each isomer), butylcyclohexane (each isomer), pentylcyclohexane (each isomer), hexylcyclohexane ( Each isomer) alkyl-substituted cyclohexa Dialkyl-substituted cyclohexane such as dimethylcyclohexane (each isomer), diethylcyclohexane (each isomer), dibutylcyclohexane (each isomer); 1,5,5-trimethylcyclohexane, 1,5,5-triethylcyclohexane, 1 , 5,5-tripropylcyclohexane (each isomer), trialkyl-substituted cyclohexane such as 1,5,5-tributylcyclohexane (each isomer); monoalkyl-substituted benzene such as toluene, ethylbenzene, propylbenzene; xylene, diethylbenzene And dialkyl-substituted benzenes such as dipropylbenzene; aromatic hydrocarbons such as diphenylalkane and benzene. Of these, hexamethylene, phenylene, diphenylmethane, toluene, cyclohexane, xylenyl, methylcyclohexane, isophorone and dicyclohexylmethane groups are preferably used.

  Examples of such polyamine compounds include hexamethylenediamine, 4,4′-methylenebis (cyclohexylamine) (each isomer), cyclohexanediamine (each isomer), 3-aminomethyl-3,5,5-trimethyl. Examples include aliphatic diamines such as cyclohexylamine (each isomer); aromatic diamines such as phenylenediamine (each isomer) and toluenediamine (each isomer) 4,4′-methylenedianiline. Among them, hexamethylenediamine, 4,4′-methylenebis (cyclohexylamine) (each isomer), cyclohexanediamine (each isomer), 3-aminomethyl-3,5,5-trimethylcyclohexylamine (each isomer), etc. Aliphatic diamines are preferably used, among which hexamethylenediamine, 4,4′-methylenebis (cyclohexylamine), and 3-aminomethyl-3,5,5-trimethylcyclohexylamine are more preferably used.

<Reaction of diaryl carbonate and amine compound>
The reaction between the diaryl carbonate described above and an amine compound will be described.
The reaction between the diaryl carbonate and the amine compound is carried out in the presence of an aromatic hydroxy compound. As the aromatic hydroxy compound, a compound having one hydroxyl group directly bonded to the aromatic hydrocarbon ring constituting the aromatic hydroxy compound is preferable. Even an aromatic hydroxy compound having two or more hydroxyl groups directly bonded to the aromatic hydrocarbon ring constituting the aromatic hydroxy compound is used as the aromatic hydroxy compound constituting the composition of the present embodiment. However, the viscosity of the solution may increase in the reaction between the diaryl carbonate and the amine compound, and the reaction efficiency may be lowered, or the efficiency may be lowered during the transfer of the reaction liquid described later.

Aromatic hydroxy compounds used in the reaction of diaryl carbonate with amine compounds include phenol, methyl-phenol (each isomer), ethyl-phenol (each isomer), propyl-phenol (each isomer), butyl- Phenol (each isomer), pentyl-phenol (each isomer), hexyl-phenol (each isomer), heptyl-phenol (each isomer), octyl-phenol (each isomer), nonyl-phenol (each isomer) ), Decyl-phenol (each isomer), dodecyl-phenol (each isomer), phenyl-phenol (each isomer), phenoxyphenol (each isomer), cumyl-phenol (each isomer) , Dimethyl-phenol (each isomer), diethyl-phenol (each isomer), dipropyl- Enol (each isomer), dibutyl-phenol (each isomer), dipentyl-phenol (each isomer), dihexyl-phenol (each isomer), diheptyl-phenol (each isomer), dioctyl-phenol (each isomer) ), Dinonyl-phenol (each isomer), didecyl-phenol (each isomer), didodecyl-phenol (each isomer), diphenyl-phenol (each isomer), diphenoxyphenol (each isomer), dicumyl-phenol (Each isomer) methyl-ethyl-phenol (each isomer), methyl-propyl-phenol (each isomer), methyl-butyl-phenol (each isomer), methyl-pentyl-phenol (each isomer), methyl -Hexyl-phenol (each isomer), methyl-heptyl-phenol (each isomer), methyl- Cutyl-phenol (each isomer), methyl-nonyl-phenol (each isomer), methyl-decyl-phenol (each isomer), methyl-dodecyl-phenol (each isomer), methyl-phenyl-phenol (each isomer) ), Methyl-phenoxyphenol (each isomer), methyl-cumyl-phenol (each isomer), ethyl-propyl-phenol (each isomer), ethyl-butyl-phenol (each isomer), ethyl-pentyl- Phenol (each isomer), ethyl-hexyl-phenol (each isomer), ethyl-heptyl-phenol (each isomer), ethyl-octyl-phenol (each isomer), ethyl-nonyl-phenol (each isomer) , Ethyl-decyl-phenol (each isomer), ethyl-dodecyl-phenol (each isomer), ethyl-phenyl -Phenol (each isomer), ethyl-phenoxyphenol (each isomer), ethyl-cumyl-phenol (each isomer) propyl-butyl-phenol (each isomer), propyl-pentyl-phenol (each isomer), Propyl-hexyl-phenol (each isomer), propyl-heptyl-phenol (each isomer), propyl-octyl-phenol (each isomer), propyl-nonyl-phenol (each isomer), propyl-decyl-phenol ( Each isomer), propyl-dodecyl-phenol (each isomer), propyl-phenyl-phenol (each isomer), propyl-phenoxyphenol (each isomer), propyl-cumyl-phenol (each isomer) butyl-pentyl -Phenol (each isomer), butyl-hexyl-phenol (each isomer), Ru-heptyl-phenol (each isomer), butyl-octyl-phenol (each isomer), butyl-nonyl-phenol (each isomer), butyl-decyl-phenol (each isomer), butyl-dodecyl-phenol ( Isomers), butyl-phenyl-phenol (each isomer), butyl-phenoxyphenol (each isomer), butyl-cumyl-phenol (each isomer) pentyl-hexyl-phenol (each isomer), pentyl-heptyl -Phenol (each isomer), Pentyl-octyl-phenol (each isomer), Pentyl-nonyl-phenol (each isomer), Pentyl-decyl-phenol (each isomer), Pentyl-dodecyl-phenol (each isomer) ), Pentyl-phenyl-phenol (each isomer), pentyl-phenoxyphenol (each different ), Pentyl-cumyl-phenol (each isomer) hexyl-heptyl-phenol (each isomer), hexyl-octyl-phenol (each isomer), hexyl-nonyl-phenol (each isomer), hexyl-decyl- Phenol (each isomer), hexyl-dodecyl-phenol (each isomer), hexyl-phenyl-phenol (each isomer), hexyl-phenoxyphenol (each isomer), hexyl-cumyl-phenol (each isomer) heptyl -Octyl-phenol (each isomer), heptyl-nonyl-phenol (each isomer), heptyl-decyl-phenol (each isomer), heptyl-dodecyl-phenol (each isomer), heptyl-phenyl-phenol (each Isomers), heptyl-phenoxyphenol (each isomer), heptyl-cumyl -Phenol (each isomer) Octyl-nonyl-phenol (each isomer), Octyl-decyl-phenol (each isomer), Octyl-dodecyl-phenol (each isomer), Octyl-phenyl-phenol (each isomer) Octyl-phenoxyphenol (each isomer), octyl-cumyl-phenol (each isomer), nonyl-decyl-phenol (each isomer), nonyl-dodecyl-phenol (each isomer), nonyl-phenyl-phenol (each Isomers), nonyl-phenoxyphenol (each isomer), nonyl-cumyl-phenol (each isomer) dodecyl-phenyl-phenol (each isomer), dodecyl-phenoxyphenol (each isomer), dodecyl-cumyl-phenol Disubstituted phenols such as (each isomer), trimethyl-phenol (each isomer) ), Triethyl-phenol (each isomer), tripropyl-phenol (each isomer), tributyl-phenol (each isomer), tripentyl-phenol (each isomer), trihexyl-phenol (each isomer), triheptyl- Phenol (each isomer), Trioctyl-phenol (each isomer), Trinonyl-phenol (each isomer), Tridecyl-phenol (each isomer), Tridodecyl-phenol (each isomer), Triphenyl-phenol (each isomer) ), Triphenoxyphenol (each isomer), tricumyl-phenol (each isomer), dimethyl-ethyl-phenol (each isomer), dimethyl-propyl-phenol (each isomer), dimethyl-butyl-phenol (each Isomers), dimethyl-pentyl-phenol (each isomer), dimethyl Ru-hexyl-phenol (each isomer), dimethyl-heptyl-phenol (each isomer), dimethyl-octyl-phenol (each isomer), dimethyl-nonyl-phenol (each isomer), dimethyl-decyl-phenol ( Isomers), dimethyl-dodecyl-phenol (each isomer), dimethyl-phenyl-phenol (each isomer), dimethyl-phenoxyphenol (each isomer), dimethyl-cumyl-phenol (each isomer), diethyl- Methyl-phenol (each isomer), diethyl-propyl-phenol (each isomer), diethyl-butyl-phenol (each isomer), diethyl-pentyl-phenol (each isomer), diethyl-hexyl-phenol (each isomer) ), Diethyl-heptyl-phenol (each isomer), diethyl-octyl-sulfur Enol (each isomer), diethyl-nonyl-phenol (each isomer), diethyl-decyl-phenol (each isomer), diethyl-dodecyl-phenol (each isomer), diethyl-phenyl-phenol (each isomer) , Diethyl-phenoxyphenol (each isomer), diethyl-cumyl-phenol (each isomer) dipropyl-methyl-phenol (each isomer), dipropyl-ethyl-phenol (each isomer), dipropyl-butyl-phenol (each Isomers), dipropyl-pentyl-phenol (each isomer), dipropyl-hexyl-phenol (each isomer), dipropyl-heptyl-phenol (each isomer), dipropyl-octyl-phenol (each isomer), dipropyl- Nonyl-phenol (each isomer), dipropyl-decyl-pheno (Each isomer), dipropyl-dodecyl-phenol (each isomer), dipropyl-phenyl-phenol (each isomer), dipropyl-phenoxyphenol (each isomer), dipropyl-cumyl-phenol (each isomer) dibutyl- Methyl-phenol (each isomer), dibutyl-ethyl-phenol (each isomer), dibutyl-propyl-phenol (each isomer), dibutyl-pentyl-phenol (each isomer), dibutyl-hexyl-phenol (each isomer) ), Dibutyl-heptyl-phenol (each isomer), dibutyl-octyl-phenol (each isomer), dibutyl-nonyl-phenol (each isomer), dibutyl-decyl-phenol (each isomer), dibutyl-dodecyl -Phenol (each isomer), dibutyl-phenyl-phenol (each isomer) ), Dibutyl-phenoxyphenol (each isomer), dibutyl-cumyl-phenol (each isomer) dipentyl-methyl-phenol (each isomer), dipentyl-ethyl-phenol (each isomer), dipentyl-propyl-phenol ( Each isomer), dipentyl-butyl-phenol (each isomer), dipentyl-hexyl-phenol (each isomer), dipentyl-heptyl-phenol (each isomer), dipentyl-octyl-phenol (each isomer), dipentyl -Nonyl-phenol (each isomer), dipentyl-decyl-phenol (each isomer), dipentyl-dodecyl-phenol (each isomer), dipentyl-phenyl-phenol (each isomer), dipentyl-phenoxyphenol (each isomer) Body), dipentyl-cumyl-phenol (each Properties: Dihexyl-methyl-phenol (each isomer), Dihexyl-ethyl-phenol (each isomer), Dihexyl-propyl-phenol (each isomer), Dihexyl-butyl-phenol (each isomer), Dihexyl-pentyl -Phenol (each isomer), dihexyl-heptyl-phenol (each isomer), dihexyl-octyl-phenol (each isomer), dihexyl-nonyl-phenol (each isomer), dihexyl-decyl-phenol (each isomer) ), Dihexyl-dodecyl-phenol (each isomer), dihexyl-phenyl-phenol (each isomer), dihexyl-phenoxyphenol (each isomer), dihexyl-cumyl-phenol (each isomer) diheptyl-methyl-phenol ( Each isomer), diheptyl-ethyl-phenol ( Isomers), diheptyl-propyl-phenol (each isomer), diheptyl-butyl-phenol (each isomer), diheptyl-pentyl-phenol (each isomer), diheptyl-hexyl-phenol (each isomer), diheptyl- Octyl-phenol (each isomer), diheptyl-nonyl-phenol (each isomer), diheptyl-decyl-phenol (each isomer), diheptyl-dodecyl-phenol (each isomer), diheptyl-phenyl-phenol (each isomer) ), Diheptyl-phenoxyphenol (each isomer), diheptyl-cumyl-phenol (each isomer) dioctyl-methyl-phenol (each isomer), dioctyl-ethyl-phenol (each isomer), dioctyl-propyl-phenol (Each isomer), Dioctyl-Butyl-Fe (Each isomer), dioctyl-pentyl-phenol (each isomer), dioctyl-hexyl-phenol (each isomer), dioctyl-heptyl-phenol (each isomer), dioctyl-nonyl-phenol (each isomer) ), Dioctyl-decyl-phenol (each isomer), dioctyl-dodecyl-phenol (each isomer), dioctyl-phenyl-phenol (each isomer), dioctyl-phenoxyphenol (each isomer), dioctyl-cumyl-phenol (Each isomer), dinonyl-methyl-phenol (each isomer), dinonyl-ethyl-phenol (each isomer), dinonyl-propyl-phenol (each isomer), dinonyl-butyl-phenol (each isomer), Dinonyl-pentyl-phenol (each isomer), dinonyl-hexyl-pheno Diol (each isomer), dinonyl-heptyl-phenol (each isomer), dinonyl-octyl-phenol (each isomer), dinonyl-decyl-phenol (each isomer), dinonyl-dodecyl-phenol (each isomer) ), Dinonyl-phenyl-phenol (each isomer), dino

Nyl-phenoxyphenol (each isomer), dinonyl-cumyl-phenol (each isomer), didecyl-methyl-phenol (each isomer), didecyl-ethyl-phenol (each isomer), didecyl-propyl-phenol (each Isomers), didecyl-butyl-phenol (each isomer), didecyl-pentyl-phenol (each isomer), didecyl-hexyl-phenol (each isomer), didecyl-heptyl-phenol (each isomer), didecyl- Octyl-phenol (each isomer), didecyl-nonyl-phenol (each isomer), didecyl-dodecyl-phenol (each isomer), didecyl-phenyl-phenol (each isomer), didecyl-phenoxyphenol (each isomer) ), Didecyl-cumyl-phenol (each isomer), didodecyl-methyl-fur Nord (each isomer), didodecyl-ethyl-phenol (each isomer), didodecyl-propyl-phenol (each isomer), didodecyl-butyl-phenol (each isomer), didodecyl-pentyl-phenol (each isomer) , Didodecyl-hexyl-phenol (each isomer), didodecyl-heptyl-phenol (each isomer), didodecyl-octyl-phenol (each isomer), didodecyl-nonyl-phenol (each isomer), didodecyl-decyl-phenol (Each isomer), didodecyl-dodecyl-phenol (each isomer), didodecyl-phenyl-phenol (each isomer), didodecyl-phenoxyphenol (each isomer), didodecyl-cumyl-phenol (each isomer), diphenyl -Methyl-phenol (each isomer), diphenyl- Cyl-phenol (each isomer), diphenyl-propyl-phenol (each isomer), diphenyl-butyl-phenol (each isomer), diphenyl-pentyl-phenol (each isomer), diphenyl-hexyl-phenol (each isomer) ), Diphenyl-heptyl-phenol (each isomer), diphenyl-octyl-phenol (each isomer), diphenyl-nonyl-phenol (each isomer), diphenyl-decyl-phenol (each isomer), diphenyl-dodecyl -Phenol (each isomer), diphenyl-phenoxyphenol (each isomer), diphenyl-cumyl-phenol (each isomer), diphenoxymethyl-phenol (each isomer), diphenoxyethyl-phenol (each isomer) , Diphenoxypropyl-phenol (each isomer), diph Enoxybutyl-phenol (each isomer), diphenoxypentyl-phenol (each isomer), diphenoxyhexyl-phenol (each isomer), diphenoxyheptyl-phenol (each isomer), diphenoxyoctyl-phenol (each isomer) ), Diphenoxynonyl-phenol (each isomer), diphenoxydecyl-phenol (each isomer), diphenoxide dodecyl-phenol (each isomer), diphenoxyphenyl-phenol (each isomer), diphenoxy Mil-phenol (each isomer), dicumyl-methyl-phenol (each isomer), dicumyl-ethyl-phenol (each isomer), dicumyl-propyl-phenol (each isomer), dicumyl-butyl-phenol (each isomer) Body), dicumyl-pentyl-phenol (each isomer), dicum Ru-hexyl-phenol (each isomer), dicumyl-heptyl-phenol (each isomer), dicumyl-octyl-phenol (each isomer), dicumyl-nonyl-phenol (each isomer), dicumyl-decyl-phenol ( Each isomer), dicumyl-dodecyl-phenol (each isomer), dicumyl-phenyl-phenol (each isomer), dicumyl-phenoxyphenol (each isomer), methyl-ethyl-propyl-phenol (each isomer), Methyl-ethyl-butyl-phenol (each isomer), methyl-ethyl-pentyl-phenol (each isomer), methyl-ethyl-hexyl-phenol (each isomer), methyl-ethyl-heptyl-phenol (each isomer) ), Methyl-ethyl-octyl-phenol (each isomer), methyl-ethyl-nonyl- Enol (each isomer), methyl-ethyl-decyl-phenol (each isomer), methyl-ethyl-dodecyl-phenol (each isomer), methyl-ethyl-phenyl-phenol (each isomer), methyl-ethyl- Phenoxyphenol (each isomer), methyl-ethyl-cumyl-phenol (each isomer), methyl-propyl-methyl-propyl-butyl-phenol (each isomer), methyl-propyl-pentyl-phenol (each isomer) , Methyl-propyl-hexyl-phenol (each isomer), methyl-propyl-heptyl-phenol (each isomer), methyl-propyl-octyl-phenol (each isomer), methyl-propyl-nonyl-phenol (each isomer) ), Methyl-propyl-decyl-phenol (each isomer), methyl-propyl-dode Sil-phenol (each isomer), methyl-propyl-phenyl-phenol (each isomer), methyl-propyl-phenoxyphenol (each isomer), methyl-propyl-cumyl-phenol (each isomer), methyl-butyl -Pentyl-phenol (each isomer), methyl-butyl-hexyl-phenol (each isomer), methyl-butyl-heptyl-phenol (each isomer), methyl-butyl-octyl-phenol (each isomer), methyl -Butyl-nonyl-phenol (each isomer), methyl-butyl-decyl-phenol (each isomer), methyl-butyl-dodecyl-phenol (each isomer), methyl-butyl-phenyl-phenol (each isomer) , Methyl-butyl-phenoxyphenol (each isomer), methyl-butyl-cumyl-phenol ( Isomers), methyl-pentyl-hexyl-phenol (each isomer), methyl-pentyl-heptyl-phenol (each isomer), methyl-pentyl-octyl-phenol (each isomer), methyl-pentyl-nonyl-phenol (Each isomer), methyl-pentyl-decyl-phenol (each isomer), methyl-pentyl-dodecyl-phenol (each isomer), methyl-pentyl-phenyl-phenol (each isomer), methyl-pentyl-phenoxy Phenol (each isomer), methyl-pentyl-cumyl-phenol (each isomer), methyl-hexyl-heptyl-phenol (each isomer), methyl-hexyl-octyl-phenol (each isomer), methyl-hexyl- Nonyl-phenol (each isomer), methyl-hexyl-decyl-phenol ( Isomers), methyl-hexyl-dodecyl-phenol (each isomer), methyl-hexyl-phenyl-phenol (each isomer), methyl-hexyl-phenoxyphenol (each isomer), methyl-hexyl-cumyl-phenol ( Each isomer), ethyl-propyl-butyl-phenol (each isomer), ethyl-propyl-pentyl-phenol (each isomer), ethyl-propyl-hexyl-phenol (each isomer), ethyl-propyl-heptyl- Phenol (each isomer), ethyl-propyl-octyl-phenol (each isomer), ethyl-propyl-nonyl-phenol (each isomer), ethyl-propyl-decyl-phenol (each isomer), ethyl-propyl- Dodecyl-phenol (each isomer), ethyl-propyl-phenyl-phenol ( Each isomer), ethyl-propyl-phenoxyphenol (each isomer), ethyl-propyl-cumyl-phenol (each isomer), ethyl-butyl-phenol (each isomer), ethyl-butyl-pentyl-phenol (each Isomers), ethyl-butyl-hexyl-phenol (each isomer), ethyl-butyl-heptyl-phenol (each isomer), ethyl-butyl-octyl-phenol (each isomer), ethyl-butyl-nonyl-phenol (Each isomer), ethyl-butyl-decyl-phenol (each isomer), ethyl-butyl-dodecyl-phenol (each isomer), ethyl-butyl-phenyl-phenol (each isomer), ethyl-butyl-phenoxy Phenol (each isomer), ethyl-butyl-cumyl-phenol (each isomer), ethyl-pentyl- Xyl-phenol (each isomer), ethyl-pentyl-heptyl-phenol (each isomer), ethyl-pentyl-octyl-phenol (each isomer), ethyl-pentyl-nonyl-phenol (each isomer), ethyl- Pentyl-decyl-phenol (each isomer), ethyl-pentyl-dodecyl-phenol (each isomer), ethyl-pentyl-phenyl-phenol (each isomer), ethyl-pentyl-phenoxyphenol (each isomer), ethyl -Pentyl-cumyl-phenol (each isomer), ethyl-hexyl-heptyl-phenol (each isomer), ethyl-hexyl-octyl-phenol (each isomer), ethyl-hexyl-nonyl-phenol (each isomer) , Ethyl-hexyl-decyl-phenol (each isomer), ethyl-hexyl- Decyl-phenol (each isomer), ethyl-hexyl-phenyl-phenol (each isomer), ethyl-hexyl-phenoxyphenol (each isomer), ethyl-hexyl-cumyl-phenol (each isomer), ethyl-heptyl -Octyl-phenol (each isomer), ethyl-heptyl-nonyl-phenol (each isomer), ethyl-heptyl-decyl-phenol (each isomer), ethyl-heptyl-dodecyl-phenol (each isomer), ethyl -Heptyl-phenyl-phenol (each isomer), ethyl-heptyl-phenoxyphenol (each isomer), ethyl-heptyl-cumyl-phenol (each isomer), ethyl-octyl-phenol (each isomer), ethyl- Octyl-nonyl-phenol (each isomer), ethyl-octyl-decyl-phen Nord (each isomer), ethyl-octyl-dodecyl-phenol (each isomer), ethyl-octyl-phenyl-phenol (each isomer), ethyl-octyl-phenoxyphenol (each isomer), ethyl-octyl-cumyl -Phenol (each isomer), ethyl-nonyl-decyl-phenol (each isomer), ethyl-nonyl-dodecyl-phenol (each isomer), ethyl-nonyl-phenyl-phenol (each isomer), ethyl-nonyl -Phenoxyphenol (each isomer), ethyl-nonyl-cumyl-phenol (each isomer), ethyl-decyl-dodecyl-phenol (each isomer), ethyl-decyl-phenyl-phenol (each isomer), ethyl- Decyl-phenoxyphenol (each isomer), ethyl-decyl-cumyl-phenol (each isomer) , Ethyl-dodecyl-phenyl-phenol (each isomer), ethyl-dodecyl-phenoxyphenol (each isomer), ethyl-dodecyl-cumyl-phenol (each isomer), ethyl-phenyl-phenoxyphenol (each isomer) , Ethyl-phenyl-cumyl-phenol (each isomer), propyl-butyl-phenol (each isomer), propyl-butyl-pentyl-phenol (each isomer), propyl-butyl-hexyl-phenol (each isomer) Propyl-butyl-heptyl-phenol (each isomer), propyl-butyl-octyl-phenol (each isomer), propyl-butyl-nonyl-phenol (each isomer), propyl-butyl-decyl-phenol (each isomer) ), Propyl-butyl-dodecyl-phenol (each isomer), pro Ru-butyl-phenyl-phenol (each isomer), propyl-butyl-phenoxyphenol (each isomer), propyl-butyl-cumyl-phenol (each isomer), propyl-pentyl-phenol (each isomer), propyl -Pentyl-hexyl-phenol (each isomer), propyl-pentyl-heptyl-phenol (each isomer), propyl-pentyl-octyl-phenol (each isomer), propyl-pentyl-nonyl-phenol (each isomer) Propyl-pentyl-decyl-phenol (each isomer), propyl-pentyl-dodecyl-phenol (each isomer), propyl-pentyl-phenyl-phenol (each isomer), propyl-pentyl-phenoxyphenol (each isomer) ), Propyl-pentyl-cumyl-phenol (each isomer) ), Propyl-hexyl-phenol (each isomer), propyl-hexyl-heptyl-phenol (each isomer), propyl-hexyl-octyl-phenol (each isomer), propyl-hexyl-nonyl-phenol (each isomer) Body), propyl-hexyl-decyl-fe

Nord (each isomer), propyl-hexyl-dodecyl-phenol (each isomer), propyl-hexyl-phenyl-phenol (each isomer), propyl-hexyl-phenoxyphenol (each isomer), propyl-hexyl-cumyl -Phenol (each isomer), propyl-heptyl-octyl-phenol (each isomer), propyl-heptyl-nonyl-phenol (each isomer), propyl-heptyl-decyl-phenol (each isomer), propyl-heptyl -Dodecyl-phenol (each isomer), propyl-heptyl-phenyl-phenol (each isomer), propyl-heptyl-phenoxyphenol (each isomer), propyl-heptyl-cumyl-phenol (each isomer), propyl- Octyl-nonyl-phenol (each isomer), propyl Octyl-decyl-phenol (each isomer), propyl-octyl-dodecyl-phenol (each isomer), propyl-octyl-phenyl-phenol (each isomer), propyl-octyl-phenoxyphenol (each isomer), propyl -Octyl-cumyl-phenol (each isomer), propyl-nonyl-decyl-phenol (each isomer), propyl-nonyl-dodecyl-phenol (each isomer), propyl-nonyl-phenyl-phenol (each isomer) Propyl-nonyl-phenoxyphenol (each isomer), propyl-nonyl-cumyl-phenol (each isomer), propyl-decyl-dodecyl-phenol (each isomer), propyl-decyl-phenyl-phenol (each isomer) ), Propyl-decyl-phenoxyphenol (each isomer) Propyl-decyl-cumyl-phenol (each isomer), propyl-dodecyl-phenyl-phenol (each isomer), propyl-dodecyl-phenoxyphenol (each isomer), propyl-dodecyl-cumyl-phenol (each isomer) ), Methyl-phenol (each isomer), ethyl-phenol (each isomer), propyl-phenol (each isomer), butyl-phenol (each isomer), pentyl-phenol (each isomer), hexyl-phenol (Each isomer), heptyl-phenol (each isomer), octyl-phenol (each isomer), nonyl-phenol (each isomer), decyl-phenol (each isomer), dodecyl-phenol (each isomer) , Phenyl-phenol (each isomer), phenoxyphenol (each isomer), cumyl-phenol (each Isomers), propyl-phenyl-phenoxyphenol (each isomer), propyl-phenyl-cumyl-phenol (each isomer), propyl-phenoxycumyl-phenol (each isomer), propyl-butyl-pentyl-phenol ( Isomers), propyl-butyl-hexyl-phenol (each isomer), propyl-butyl-heptyl-phenol (each isomer), propyl-butyl-octyl-phenol (each isomer), propyl-butyl-nonyl- Phenol (each isomer), propyl-butyl-decyl-phenol (each isomer), propyl-butyl-dodecyl-phenol (each isomer), propyl-butyl-phenyl-phenol (each isomer), propyl-butyl- Phenoxyphenol (each isomer), propyl-butyl-cumyl-pheno (Each isomer), propyl-pentyl-phenol (each isomer), propyl-pentyl-hexyl-phenol (each isomer), propyl-pentyl-heptyl-phenol (each isomer), propyl-pentyl-octyl-phenol (Each isomer), propyl-pentyl-nonyl-phenol (each isomer), propyl-pentyl-decyl-phenol (each isomer), propyl-pentyl-dodecyl-phenol (each isomer), propyl-pentyl-phenyl -Phenol (each isomer), propyl-pentyl-phenoxyphenol (each isomer), propyl-pentyl-cumyl-phenol (each isomer), propyl-hexyl-heptyl-phenol (each isomer), propyl-hexyl- Octyl-phenol (each isomer), propyl-hexyl Nonyl-phenol (each isomer), propyl-hexyl-decyl-phenol (each isomer), propyl-hexyl-dodecyl-phenol (each isomer), propyl-hexyl-phenyl-phenol (each isomer), propyl- Hexyl-phenoxyphenol (each isomer), propyl-hexyl-cumyl-phenol (each isomer), propyl-heptyl-octyl-phenol (each isomer), propyl-heptyl-nonyl-phenol (each isomer), propyl -Heptyl-decyl-phenol (each isomer), propyl-heptyl-dodecyl-phenol (each isomer), propyl-heptyl-phenyl-phenol (each isomer), propyl-heptyl-phenoxyphenol (each isomer), Propyl-heptyl-cumyl-phenol (each isomer ), Propyl-octyl-nonyl-phenol (each isomer), propyl-octyl-decyl-phenol (each isomer), propyl-octyl-dodecyl-phenol (each isomer), propyl-octyl-phenyl-phenol (each Isomer), propyl-octyl-phenoxyphenol (each isomer), propyl-octyl-cumyl-phenol (each isomer), propyl-nonyl-decyl-phenol (each isomer), propyl-nonyl-dodecyl-phenol ( Isomers), propyl-nonyl-phenyl-phenol (each isomer), propyl-nonyl-phenoxyphenol (each isomer), propyl-nonyl-cumyl-phenol (each isomer), propyl-decyl-dodecyl-phenol (Each isomer), propyl-decyl-phenyl-pheno (Each isomer), propyl-decyl-phenoxyphenol (each isomer), propyl-decyl-cumyl-phenol (each isomer), propyl-dodecyl-phenyl-phenol (each isomer), propyl-dodecyl-phenoxyphenol (Each isomer), cumyl-phenol (each isomer), propyl-phenyl-phenoxyphenol (each isomer), propyl-phenyl-cumyl-phenol (each isomer), butyl-pentyl-hexyl-phenol (each isomer) ), Butyl-pentyl-heptyl-phenol (each isomer), butyl-pentyl-octyl-phenol (each isomer), butyl-pentyl-nonyl-phenol (each isomer), butyl-pentyl-decyl-phenol ( Isomers), butyl-pentyl-dodecyl-phenol (each isomer) ), Butyl-pentyl-phenyl-phenol (each isomer), butyl-pentyl-phenoxyphenol (each isomer), butyl-pentyl-cumyl-phenol (each isomer), butyl-hexyl-heptyl-phenol (each isomer) ), Butyl-hexyl-octyl-phenol (each isomer), butyl-hexyl-nonyl-phenol (each isomer), butyl-hexyl-decyl-phenol (each isomer), butyl-hexyl-dodecyl-phenol ( Isomers), butyl-hexyl-phenyl-phenol (each isomer), butyl-hexyl-phenoxyphenol (each isomer), butyl-hexyl-cumyl-phenol (each isomer), butyl-heptyl-octyl-phenol (Each isomer), butyl-heptyl-nonyl-phenol (each isomer) ), Butyl-heptyl-decyl-phenol (each isomer), butyl-heptyl-dodecyl-phenol (each isomer), butyl-heptyl-phenyl-phenol (each isomer), butyl-heptyl-phenoxyphenol (each isomer) ), Butyl-heptyl-cumyl-phenol (each isomer), butyl-octyl-nonyl-phenol (each isomer), butyl-octyl-decyl-phenol (each isomer), butyl-octyl-dodecyl-phenol ( Isomers), butyl-octyl-phenyl-phenol (each isomer), butyl-octyl-phenoxyphenol (each isomer), butyl-octyl-cumyl-phenol (each isomer), butyl-nonyl-decyl-phenol (Each isomer), butyl-nonyl-dodecyl-phenol (each isomer), Ru-nonyl-phenyl-phenol (each isomer), butyl-nonyl-phenoxyphenol (each isomer), butyl-nonyl-cumyl-phenol (each isomer), butyl-decyl-dodecyl-phenol (each isomer) Butyl-decyl-phenyl-phenol (each isomer), butyl-decyl-phenoxyphenol (each isomer), butyl-decyl-cumyl-phenol (each isomer), butyl-decyl-phenol (each isomer), Butyl-dodecyl-phenyl-phenol (each isomer), butyl-dodecyl-phenoxyphenol (each isomer), butyl-dodecyl-cumyl-phenol (each isomer), butyl-phenyl-phenol (each isomer), butyl -Phenyl-phenoxyphenol (each isomer), butyl-phenyl-cumyl-pheno (Each isomer), pentyl-hexyl-heptyl-phenol (each isomer), pentyl-hexyl-octyl-phenol (each isomer), pentyl-hexyl-nonyl-phenol (each isomer), pentyl-hexyl- Decyl-phenol (each isomer), pentyl-hexyl-dodecyl-phenol (each isomer), pentyl-hexyl-phenyl-phenol (each isomer), pentyl-hexyl-phenoxyphenol (each isomer), pentyl-hexyl -Cumyl-phenol (each isomer), pentyl-heptyl-octyl-phenol (each isomer), pentyl-heptyl-nonyl-phenol (each isomer), pentyl-heptyl-decyl-phenol (each isomer), pentyl -Heptyl-dodecyl-phenol (each isomer), pentyl-he Ptyl-phenyl-phenol (each isomer), pentyl-heptyl-phenoxyphenol (each isomer), pentyl-heptyl-cumyl-phenol (each isomer), pentyl-octyl-nonyl-phenol (each isomer), pentyl -Octyl-decyl-phenol (each isomer), pentyl-octyl-dodecyl-phenol (each isomer), pentyl-octyl-phenyl-phenol (each isomer), pentyl-octyl-phenoxyphenol (each isomer), Pentyl-octyl-cumyl-phenol (each isomer), pentyl-nonyl-decyl-phenol (each isomer), pentyl-nonyl-dodecyl-phenol (each isomer), pentyl-nonyl-phenyl-phenol (each isomer) ), Pentyl-nonyl-phenoxyphenol (each isomer) ), Pentyl-nonyl-cumyl-phenol (each isomer), pentyl-decyl-dodecyl-phenol (each isomer), pentyl-decyl-phenyl-phenol (each isomer), pentyl-decyl-phenoxyphenol (each isomer) ), Pentyl-decyl-cumyl-phenol (each isomer), pentyl-decyl-dodecyl-phenol (each isomer), pentyl-decyl-phenyl-phenol (each isomer), pentyl-decyl-phenoxyphenol (each Isomers), pentyl-decyl-cumyl-phenol (each isomer), pentyl-dodecyl-phenyl-phenol (each isomer), pentyl-dodecyl-phenoxyphenol (each isomer), pentyl-dodecyl-cumyl-phenol ( Each isomer), pentyl-phenyl-phenoxypheno (Each isomer), pentyl-phenyl-cumyl-phenol (each isomer), hexyl-heptyl-octyl-phenol (each isomer), hexyl-heptyl-nonyl-phenol (each isomer), hexyl-heptyl-decyl Phenol (each isomer), hexyl-heptyl-dodecyl-phenol (each isomer), hexyl-heptyl-phenyl-phenol (each isomer), hexyl-heptyl-phenoxyphenol (each isomer), hexyl-heptyl- Cumyl-phenol (each isomer), hexyl-octyl-nonyl-phenol (each isomer), hexyl-octyl-decyl-phenol (each isomer), hexyl-octyl-dodecyl-phenol (each isomer), hexyl- Octyl-phenyl-phenol (each isomer), hexyl-octyl Ru-phenoxyphenol (each isomer), hexyl-octyl-cumyl-phenol (each isomer), hexyl-nonyl-decyl-phenol (each isomer), hexyl-nonyl-dodecyl-phenol (each isomer), hexyl -Nonyl-phenyl-phenol (each isomer)

Hexyl-nonyl-phenoxyhexyl-decyl-dodecyl-phenol (each isomer), hexyl-decyl-phenyl-phenol (each isomer), hexyl-decyl-phenoxyphenol (each isomer), hexyl-decyl-cumyl- Phenol (each isomer), hexyl-dodecyl-phenyl-phenol (each isomer), hexyl-dodecyl-phenoxyphenol (each isomer), hexyl-dodecyl-cumyl-phenol (each isomer), hexyl-phenyl-phenoxy Phenol (each isomer), hexyl-phenyl-cumyl-phenol (each isomer), heptyl-octyl-nonyl-phenol (each isomer), heptyl-octyl-decyl-phenol (each isomer), heptyl-octyl- Dodecyl-phenol (each isomer), heptyl -Octyl-phenyl-phenol (each isomer), heptyl-octyl-phenoxyphenol (each isomer), heptyl-octyl-cumyl-phenol (each isomer), heptyl-nonyl-decyl-phenol (each isomer), Heptyl-nonyl-dodecyl-phenol (each isomer), heptyl-nonyl-phenyl-phenol (each isomer), heptyl-nonyl-phenoxyphenol (each isomer), heptyl-nonyl-cumyl-phenol (each isomer) , Heptyl-decyl-dodecyl-phenol (each isomer), heptyl-decyl-phenyl-phenol (each isomer), heptyl-decyl-phenoxyphenol (each isomer), heptyl-decyl-cumyl-phenol (each isomer) ), Heptyl-dodecyl-phenyl-phenol (each isomer) , Heptyl-dodecyl-phenoxyphenol (each isomer), heptyl-dodecyl-cumyl-phenol (each isomer), heptyl-phenyl-phenoxyphenol (each isomer), heptyl-phenyl-cumyl-phenol (each isomer) Octyl-nonyl-decyl-phenol (each isomer), octyl-nonyl-dodecyl-phenol (each isomer), octyl-nonyl-phenyl-phenol (each isomer), octyl-nonyl-phenoxyphenol (each isomer) ), Octyl-nonyl-cumyl-phenol (each isomer), octyl-decyl-dodecyl-phenol (each isomer), octyl-decyl-phenyl-phenol (each isomer), octyl-decyl-phenoxyphenol (each isomer) Body), octyl-decyl-cumyl-phenol (each Isomers), octyl-dodecyl-phenyl-.tenol (each isomer), octyl-dodecyl-phenoxyphenol (each isomer), octyl-dodecyl-cumyl-phenol (each isomer), octyl-dodecyl-phenyl- Phenol (each isomer), octyl-dodecyl-phenoxyphenol (each isomer), octyl-dodecyl-cumyl-phenol (each isomer), octyl-phenyl-phenoxyphenol (each isomer), octyl-phenyl-cumyl- Phenol (each isomer), Nonyl-decyl-dodecyl-phenol (each isomer), Nonyl-decyl-phenyl-phenol (each isomer), Nonyl-decyl-phenoxyphenol (each isomer), Nonyl-decyl-cumyl -Phenol (each isomer), nonyl-dodecyl-phenyl-phen Nord (each isomer), Nonyl-dodecyl-phenoxyphenol (each isomer), Nonyl-dodecyl-cumyl-phenol (each isomer), Nonyl-phenyl-phenoxyphenol (each isomer), Nonyl-phenyl-cumyl- Phenol (each isomer), decyl-dodecyl-phenyl-phenol (each isomer), decyl-dodecyl-phenoxyphenol (each isomer), decyl-dodecyl-cumyl-phenol (each isomer), decyl-phenyl-phenoxy Phenol (each isomer), decyl-phenyl-cumyl-phenol (each isomer), dodecyl-phenyl-phenoxyphenol (each isomer), dodecyl-phenyl-cumyl-phenol (each isomer), phenyl-phenoxycumyl -Trisubstituted phenols such as phenol (each isomer) Rukoto can. Among these aromatic hydroxy compounds, a compound R ¹ OH in which a hydrogen atom is added to a group R ¹ O (R ¹ is an aromatic group as defined above, and O represents an oxygen atom) constituting diaryl carbonate is added. Corresponding compounds are more preferably used. This is because the types of compounds in the reaction mixture obtained by the reaction between the diaryl carbonate and the amine compound can be reduced, and the separation operation can be simplified.

The amine compound is preferably supplied in a liquid state to the reactor for producing the aryl carbamate. In general, many of the amine compounds exemplified above are solid at room temperature (for example, 20 ° C.). In such a case, the amine compound is heated to a temperature higher than the melting point of the amine compound and supplied in a liquid state. However, if an amine compound is supplied at an excessively high temperature, a side reaction such as a heat denaturation reaction due to heating may occur. And is preferably supplied in a liquid state at a relatively low temperature.
The reaction conditions for the reaction between the diaryl carbonate and the amine compound vary depending on the compound to be reacted, but the reaction rate is increased in a range of 1 to 1000 times the stoichiometric ratio of diaryl carbonate to the amino group of the amine compound. In order to complete the reaction early, the diaryl carbonate is preferably in an excess amount relative to the amino group of the amine compound, but preferably in the range of 1.1 to 50 times in view of the size of the reactor, Preferably, it is the range of 1.5 to 10 times. The amount of the aromatic hydroxy compound used is in the range of 1 to 100 times, more preferably 1.2 to 50 times, more preferably 1.2 to 50 times the stoichiometric ratio of the aromatic hydroxy compound to the amino group of the amine compound. Preferably it is 1.5 to 10 times. The reaction temperature is usually in the range of 0 ° C to 150 ° C. In order to increase the reaction rate, a high temperature is preferable, but on the other hand, an unfavorable reaction may occur at a high temperature. In order to keep the reaction temperature constant, a known cooling device or heating device may be installed in the reactor. Moreover, although reaction pressure changes with the kind of compound to be used, and reaction temperature, any of pressure reduction, a normal pressure, and pressurization may be sufficient, and it is performed in the range of 20-1x10 < ⁶ > Pa normally. There is no restriction | limiting in particular in reaction time (in the case of a continuous method), Usually, 0.001 to 50 hours, Preferably it is 0.01 to 20 hours, More preferably, it is 0.1 to 10 hours. Alternatively, the reaction solution can be collected, and the reaction can be terminated after confirming that the desired amount of aryl carbamate has been produced by, for example, liquid chromatography.

  In the present embodiment, a catalyst is preferably not used in the reaction between the diaryl carbonate and the amine compound. When the aryl carbamate is heated in the presence of the metal component derived from the catalyst in the transfer of the reaction mixture and the thermal decomposition reaction of the carbamate ester contained in the reaction mixture, which will be described later, the thermal denaturation reaction of the aryl carbamate Etc. may occur. Although a catalyst is used when the reaction between the diaryl carbonate and the amine compound is performed and the catalyst is removed, the reaction mixture can be transferred and a thermal decomposition reaction can be performed, but this is not preferable because the number of steps increases.

  However, it is not denied that a catalyst is used for the purpose of completing the reaction in a short time and lowering the reaction temperature. In general, since aromatic amine compounds are less reactive than aliphatic amines, the use of a catalyst may be effective when an aromatic amine compound is used as the amine compound. In the case of using a catalyst, for example, an organometallic compound such as tin, lead, copper, titanium, an inorganic metal compound, an alkali metal, an alkaline earth metal alcoholate, lithium, sodium, potassium, calcium, barium Basic catalysts such as methylate, ethylate and butyrate (each isomer) can be used.

In the present embodiment, preferably, no reaction solvent is used other than the above-mentioned aromatic hydroxy compound and / or excess diaryl carbonate. The prior art may disclose a method using a reaction solvent that is inert with respect to the isocyanate and carbamate produced by the thermal decomposition reaction of a diarylcarbamate, but if such an inert solvent is used, it may be disclosed. The separation from the isocyanate and aromatic hydroxy compound produced by the thermal decomposition reaction of a carbamic acid ester, which will be described later, becomes complicated, which is not preferable.
The reactor used in the reaction between the diaryl carbonate and the amine compound can be a known tank reactor, tower reactor, or distillation column. The material of the reactor and the line adversely affects the starting materials and reactants. If it does not reach, any known one may be used, but SUS304, SUS316, SUS316L, etc. are inexpensive and can be preferably used.

<Aryl carbamate>
By this reaction, a reaction mixture containing an aryl carbamate, excess diaryl carbonate, and an aromatic hydroxy compound is obtained.
The aryl carbamate is a compound represented by the following formula (18).

(Where:
R ² is a group defined above and represents a group derived from an amine compound;
R ¹ is a group as defined above and represents a group derived from diaryl carbonate;
n is an integer of 2 to 10, and is the same number as the number of amino groups of the amine compound. )

  Examples of the carbamic acid ester represented by the above formula (18) include N, N′-hexanediyl-bis-carbamic acid diphenyl ester and N, N′-hexanediyl-bis-carbamic acid di (methylphenyl) ester. (Each isomer), N, N′-hexanediyl-bis-carbamic acid di (ethylphenyl) ester (each isomer), N, N′-hexanediyl-bis-carbamic acid di (propylphenyl) ester (each Isomers), N, N′-hexanediyl-bis-carbamic acid di (butylphenyl) ester (each isomer), N, N′-hexanediyl-bis-carbamic acid di (pentylphenyl) ester (each isomer) ), Diphenyl-4,4′-methylene-dicyclohexyl carbamate, di (methylphenyl) -4,4′-methylene-dicyclohexyl Silcarbamate, di (ethylphenyl) -4,4′-methylene-dicyclohexylcarbamate, di (propylphenyl) -4,4′-methylene-dicyclohexylcarbamate (each isomer), di (butylphenyl) -4,4 ′ -Methylene-dicyclohexyl carbamate (each isomer), di (pentylphenyl) -4,4'-methylene-dicyclohexyl carbamate (each isomer), di (hexylphenyl) -4,4'-methylene-dicyclohexyl carbamate (each isomer) ), Di (heptylphenyl) -4,4′-methylene-dicyclohexylcarbamate (each isomer), di (octylphenyl) -4,4′-methylene-dicyclohexylcarbamate (each isomer), 3- (phenoxycarbonyl) Amino-methyl) -3,5,5-trimethylcycle Hexylcarbamic acid phenyl ester, 3- (methylphenoxycarbonylamino-methyl) -3,5,5-trimethylcyclohexylcarbamic acid (methylphenoxy) ester (each isomer), 3- (ethylphenoxycarbonylamino-methyl) -3 , 5,5-Trimethylcyclohexylcarbamic acid (ethylphenyl) ester (each isomer), 3- (propylphenoxycarbonylamino-methyl) -3,5,5-trimethylcyclohexylcarbamic acid (propylphenyl) ester (each isomer) ), 3- (butylphenoxycarbonylamino-methyl) -3,5,5-trimethylcyclohexylcarbamic acid (butylphenyl) ester (each isomer), 3- (pentylphenoxycarbonylamino-methyl) -3,5,5 -Trimmer Tylcyclohexylcarbamic acid (pentylphenyl) ester (each isomer), 3- (hexylphenoxycarbonylamino-methyl) -3,5,5-trimethylcyclohexylcarbamic acid (hexylphenyl) ester (each isomer), 3- ( Heptylphenoxycarbonylamino-methyl) -3,5,5-trimethylcyclohexylcarbamic acid (heptylphenyl) ester (each isomer), 3- (octylphenoxycarbonylamino-methyl) -3,5,5-trimethylcyclohexylcarbamic acid (Octylphenyl) ester (each isomer), toluene-dicarbamic acid diphenyl ester (each isomer), toluene-dicarbamic acid di (methylphenyl) ester (each isomer), toluene-dicarbamic acid di (ethylphenyl) ester Ter (each isomer), toluene-dicarbamic acid di (propylphenyl) ester (each isomer), toluene-dicarbamic acid di (butylphenyl) ester (each isomer), toluene-dicarbamic acid di (pentylphenyl) ester ( Each isomer), toluene-dicarbamic acid di (hexylphenyl) ester (each isomer), toluene-dicarbamic acid di (heptylphenyl) ester (each isomer), toluene-dicarbamic acid di (octylphenyl) ester (each isomer) ), N, N ′-(4,4′-methanediyl-diphenyl) -biscarbamic acid diphenyl ester, N, N ′-(4,4′-methanediyl-diphenyl) -biscarbamic acid di (methylphenyl) ester N, N '-(4,4'-methanediyl-diphenyl) -biscarbamic acid (Ethylphenyl) ester, N, N ′-(4,4′-methanediyl-diphenyl) -biscarbamic acid di (propylphenyl) ester, N, N ′-(4,4′-methanediyl-diphenyl) -biscarbamine Acid di (butylphenyl) ester, N, N ′-(4,4′-methanediyl-diphenyl) -biscarbamic acid di (pentylphenyl) ester, N, N ′-(4,4′-methanediyl-diphenyl)- Biscarbamic acid di (hexylphenyl) ester, N, N ′-(4,4′-methanediyl-diphenyl) -biscarbamic acid di (heptylphenyl) ester, N, N ′-(4,4′-methanediyl-diphenyl) ) -Biscarbamic acid di (octylphenyl) ester (each isomer) and the like.

<Transfer of urethanization reaction liquid>
The reaction liquid containing aryl carbamate produced by the above method is preferably taken out of the reactor in which the reaction is performed, and a reactor in which the aryl carbamate is subjected to thermal decomposition (hereinafter referred to as thermal decomposition reactor). And the thermal decomposition reaction of the aryl carbamate is carried out. In this way, by separating the reactor for producing aryl carbamate from the thermal decomposition reactor, it is possible to select a reactor suitable for each reaction and to set reaction conditions flexibly. The yield in each reaction can be increased.

  These aryl carbamates often have a high melting point because they easily form hydrogen bonds between molecules due to the urethane bonds constituting the aryl carbamates. In transferring such an aryl carbamate, for example, a solid carbamate ester subjected to shaping treatment such as pulverization or processing into a pellet can be transferred. However, when transferring the solid aryl carbamate that has been subjected to the shaping treatment, a certain amount of aryl carbamate is stably transferred when the transfer line is blocked or the shape of the aryl carbamate is highly variable. Therefore, in many cases, a complicated apparatus is required, or a step of aligning the shape of the aryl carbamate within a certain range is required. Thus, the aryl carbamate is preferably fed in liquid form to the pyrolysis reactor.

As a method of supplying the aryl carbamate to the thermal decomposition reactor in a liquid state, a method of supplying as a reaction mixture obtained by a reaction of a diaryl carbonate and an amine compound can be preferably employed.
Although it is possible to transfer the aryl carbamate as a liquid by heating it to a temperature higher than the melting point of the aryl carbamate, it is possible to prevent solidification during the transfer, so that the melting point during the transfer is prevented. It is necessary to heat to a high temperature (for example, 200 ° C.). When the aryl carbamate is held at such a high temperature, the thermal decomposition reaction of the aryl carbamate occurs in an undesired place to generate isocyanate, or the thermal denaturation reaction of the aryl carbamate as described above occurs. There are many.

  In contrast, the reaction mixture obtained by the reaction of the diaryl carbonate and the amine compound is uniform at a temperature lower than the melting point of the aryl carbamate, even if it is liquid at room temperature (20 ° C.) or solid at room temperature. In many cases, the heat-denaturing reaction of aryl carbamate can be suppressed.

  Surprisingly, the present inventors surprisingly transferred the aryl carbamate by transferring the aryl carbamate as a reaction mixture obtained by the reaction between the diaryl carbonate and the amine compound. We found that the decrease was suppressed. Although the reason why such an effect is exhibited is not clear, in the reaction for forming a urea bond represented by the above formula (2), the present inventors have included an aromatic hydroxy compound contained in the reaction mixture, and a carbamine. The acid ester urethane bond (-NHCOO-) forms a hydrogen bond, which makes it difficult for the urethane bonds to come close to each other. Yes.

  The transfer of the reaction mixture is preferably performed in a temperature range of 10 ° C to 180 ° C, more preferably 30 ° C to 170 ° C, and still more preferably 50 ° C to 150 ° C.

  In the method in which aryl carbamate is supplied to the thermal decomposition reaction as a reaction mixture obtained by the reaction of diaryl carbonate and an amine compound, the reaction mixture is supplied without performing a distillation separation operation, etc., thus simplifying the process. There is also an advantage that can be realized. In addition, in the method of supplying a part or all of the aromatic hydroxy compound as a separated mixture from the reaction mixture, it is not necessary to perform the operation of isolating only the aryl carbamate from the reaction mixture, and therefore the process is simplified. Is done.

<Thermal decomposition of aryl carbamate>
Next, production of isocyanate by thermal decomposition reaction of aryl carbamate will be described.
The thermal decomposition reaction in the present embodiment is a reaction for generating a corresponding isocyanate and an aromatic hydroxy compound from aryl carbamate.
The reaction temperature is usually in the range of 100 ° C. to 300 ° C., and a high temperature is preferable for increasing the reaction rate. On the other hand, at a high temperature, the above-mentioned secondary admixture may be added depending on the aryl carbamate and / or the product isocyanate. Since reaction may be caused, it is preferably in the range of 150 ° C to 250 ° C. In order to keep the reaction temperature constant, a known cooling device or heating device may be installed in the reactor. Moreover, although reaction pressure changes with the kind of compound to be used, and reaction temperature, any of pressure reduction, a normal pressure, and pressurization may be sufficient, and it is performed in the range of 20-1x10 < ⁶ > Pa normally. There is no restriction | limiting in particular in reaction time (in the case of a continuous method), Usually, 0.001 to 100 hours, Preferably it is 0.005 to 50 hours, More preferably, it is 0.01 to 10 hours.

In the present embodiment, preferably no catalyst is used. Although a thermal decomposition reaction may be promoted using a catalyst, it is not preferable because the side reaction with the above-described aryl carbamate and / or isocyanate which is a product tends to occur in many cases.
The aryl carbamate may cause the side reaction as described above when held at a high temperature for a long time. Moreover, the isocyanate produced | generated by thermal decomposition reaction may cause a side reaction as mentioned above. Therefore, the time during which the aryl carbamate and the isocyanate are maintained at a high temperature is preferably as short as possible, and the thermal decomposition reaction is preferably performed by a continuous method. In the continuous process, the mixture containing the aryl carbamate is continuously fed to a reactor and subjected to a pyrolysis reaction, and the resulting isocyanate and aromatic hydroxy compound are continuously fed from the pyrolysis reactor. This is a method of extracting. In the continuous process, the low boiling point component produced by the pyrolysis reaction of aryl carbamate is preferably recovered from the top of the pyrolysis reactor as a gas phase component, and the rest as a liquid phase component of the pyrolysis reactor. It is collected from the bottom. All compounds present in the pyrolysis reactor can be recovered as gas phase components, but are caused by aryl carbamate and / or isocyanate by the presence of liquid phase components in the pyrolysis reactor. The polymer compound produced by the side reaction is dissolved to prevent the polymer compound from adhering to and accumulating in the thermal decomposition reactor. An isocyanate and an aromatic hydroxy compound are produced by the thermal decomposition reaction of aryl carbamate, and at least one of these compounds is recovered as a gas phase component. Which compound is recovered as a gas phase component depends on the thermal decomposition reaction conditions.

  Here, the term “low-boiling component produced by thermal decomposition of aryl carbamate” used in the present embodiment corresponds to an aromatic hydroxy compound and / or isocyanate produced by thermal decomposition of the carbamate. In particular refers to compounds that can exist as gases under the conditions under which the thermal decomposition reaction is carried out.

For example, it is possible to employ a method in which an isocyanate and an aromatic hydroxy compound produced by a thermal decomposition reaction are recovered as gas phase components and a liquid phase component containing a diaryl carbonate and / or a carbamic acid ester is recovered. In this method, the isocyanate and the aromatic hydroxy compound may be recovered separately in a thermal decomposition reactor. The recovered gas phase component containing isocyanate is preferably supplied in the gas phase to a distillation apparatus for purifying and separating the isocyanate. The vapor phase component containing the recovered isocyanate can be supplied to a distillation apparatus after it is converted into a liquid phase by a condenser or the like. However, the apparatus is often complicated and the energy used is often large. Absent. On the other hand, the liquid phase component containing diaryl carbonate and / or aryl carbamate is recovered from the bottom of the pyrolysis reactor, and when the liquid phase component contains diaryl carbonate, preferably the liquid phase component is diaryl carbonate. Is recovered and the diaryl carbonate is reused. When the liquid phase component contains an aryl carbamate, preferably, a part or all of the liquid phase component is supplied to the upper part of the pyrolysis reactor, and the aryl carbamate is again supplied. Subject to thermal decomposition reaction. As used herein, the upper part of the pyrolysis reactor means, for example, when the pyrolysis reactor is a distillation column, it indicates the theoretical plate number that is at least the second stage above the tower bottom, and the pyrolysis reactor is a thin film. In the case of a distiller, it refers to the part above the heated surface part. When supplying part or all of the liquid phase component to the top of the pyrolysis reactor, the liquid phase component is preferably 50 ° C to 180 ° C, more preferably 70 ° C to 170 ° C, and still more preferably, It is transported while being kept at 100 ° C to 150 ° C.
In addition, for example, a method is adopted in which isocyanate, aromatic hydroxy compound and diaryl carbonate produced by thermal decomposition reaction are recovered as gas phase components, and liquid phase component containing aryl carbamate is recovered from the bottom of the thermal decomposition reactor. can do. Also in this method, the recovered gaseous component containing the isocyanate is preferably supplied in a gas phase to a distillation apparatus for producing and separating the isocyanate. On the other hand, part or all of the liquid phase component containing aryl carbamate is supplied to the upper part of the thermal decomposition reactor, and the aryl carbamate is again subjected to the thermal decomposition reaction. When supplying part or all of the liquid phase component to the top of the pyrolysis reactor, the liquid phase component is preferably 50 ° C to 180 ° C, more preferably 70 ° C to 170 ° C, and still more preferably, It is transported while being kept at 100 ° C to 150 ° C.
Further, for example, among the isocyanate and aromatic hydroxy compound produced by the thermal decomposition reaction, the aromatic hydroxy compound is recovered as a gas phase component, and the mixture containing the isocyanate is used as a liquid phase component, and the bottom of the thermal decomposition reactor A more recovering method can be adopted. In this case, the liquid phase component is supplied to a distillation apparatus to recover the isocyanate. When the liquid phase component contains diaryl carbonate, the diaryl carbonate is preferably separated and recovered and reused. In the case where the liquid phase component contains an aryl carbamate, preferably, the mixture containing the aryl carbamate supplies a part or all of the mixture to the top of the pyrolysis reactor, The aryl carbamate is again subjected to a thermal decomposition reaction. When supplying part or all of the liquid phase component to the top of the pyrolysis reactor, the liquid phase component is preferably 50 ° C to 180 ° C, more preferably 70 ° C to 170 ° C, and still more preferably, It is transported while being kept at 100 ° C to 150 ° C.

  As described above, in the pyrolysis reaction, it is preferable to recover the liquid phase component from the bottom of the pyrolysis reactor. By dissolving the liquid by-product produced by the side reaction caused by the aryl carbamate and / or isocyanate by causing the liquid phase component to be present in the pyrolysis reactor, the pyrolysis reaction is performed as a liquid phase component. This is because the polymer compound can be discharged from the vessel, thereby reducing the adhesion / accumulation of the polymeric compound to the thermal decomposition reactor.

  When the liquid phase component contains aryl carbamate, part or all of the liquid phase component is supplied to the top of the thermal decomposition reactor, and the aryl carbamate is again subjected to the thermal decomposition reaction. However, when this process is repeated, polymeric by-products may accumulate in the liquid phase component. In that case, part or all of the liquid phase component can be removed from the reaction system to reduce the accumulation of polymeric by-products or to maintain a constant concentration.

  The aromatic hydroxy compound and / or diaryl carbonate contained in the gas phase component and / or liquid phase component obtained in the above thermal decomposition reaction can be separated and recovered and reused. Specifically, the aromatic hydroxy compound can be reused as the reaction solvent in the reaction between the diaryl carbonate and the amine compound and / or the aromatic hydroxy compound A in the step (3) related to the production of the diaryl carbonate. Diaryl can be reused as a raw material in the production of aryl carbamates.

  Although there is no restriction | limiting in particular in the form of this thermal decomposition reactor, In order to collect | recover a gaseous phase component efficiently, Preferably a well-known distillation apparatus is used. For example, distillation tower, multistage distillation tower, multitubular reactor, continuous multistage distillation tower, packed tower, thin film evaporator, reactor with support inside, forced circulation reactor, falling film evaporator, drop evaporation Various known methods such as a method using a reactor including any of the reactors, a method using a combination thereof, and the like are used. From the viewpoint of quickly removing low-boiling components from the reaction system, a method using a reactor such as a tubular reactor, more preferably a tubular thin film evaporator, a tubular falling film evaporator, etc. A structure having a large gas-liquid contact area that can be promptly moved to the gas phase is preferable.

  The material of the pyrolysis reactor and the line may be any known material as long as it does not adversely affect the aryl carbamate, the product aromatic hydroxy compound, isocyanate, etc., but SUS304, SUS316, SUS316L and the like are inexpensive and can be preferably used.

<Cleaning of pyrolysis reactor>
In the present embodiment, the reaction liquid containing aryl carbamate obtained by reacting diaryl carbonate with an amine compound is represented by, for example, the above formula (5), formula (6), or formula (7). Contains polymeric side reaction products and the like. In many cases, the side reaction product is easily dissolved in the aromatic hydroxy compound, and thus is dissolved in the reaction solution containing the aryl carbamate. However, in the pyrolysis reactor, when most of the aromatic hydroxy compounds are withdrawn from the pyrolysis reactor as a gas phase component, the side reaction product often precipitates and adheres to the pyrolysis reactor. . In addition, with the thermal decomposition reaction of the aryl carbamate, for example, a polymer byproduct derived from the side reaction represented by the above formula (8), formula (9), formula (10) or the like is generated. In many cases, the by-product of the pyrolysis reaction also adheres to the pyrolysis reactor. If the compounds adhering to these pyrolysis reactions accumulate to some extent, they will hinder the operation of the pyrolysis reactor, and it is often difficult to operate over a long period of time. Work was necessary.

  The inventors have surprisingly found that the compounds attached to the pyrolysis reactor are easily soluble in acid. Based on this knowledge, when high boiling substances adhere to the pyrolysis reactor, the wall of the pyrolysis reactor is washed with acid, and these high boiling substances are dissolved, and from the pyrolysis reactor, A method of keeping the inside of the pyrolysis reactor (especially the wall surface) clean by removing was devised and completed. By this method, the wall of the pyrolysis reactor can be cleaned without disassembling and sweeping the pyrolysis reactor, so that the shutdown period of the pyrolysis reactor can be greatly reduced. High production efficiency.

The washing acid is not particularly limited as long as it dissolves the polymeric by-product. Either an organic acid or an inorganic acid may be used, but an organic acid is preferably used. Examples of organic acids include carboxylic acids, sulfonic acids, sulfinic acids, phenols, enols, thiophenols, imides, oximes, aromatic sulfonamides, etc., but preferably carboxylic acids, phenols Kind is used. Such compounds include formic acid, acetic acid, propionic acid, n-butyric acid, isobutyric acid, valeric acid, isovaleric acid, 2-methylbutanoic acid, pivalic acid, hexanoic acid, isocaproic acid, 2-ethylbutanoic acid, 2,2 -Dimethylbutanoic acid, heptanoic acid (each isomer), octanoic acid (each isomer), nonanoic acid (each isomer), decanoic acid (each isomer), undecanoic acid (each isomer), dodecanoic acid (each isomer) ), Tetradecanoic acid (each isomer), hexadecanoic acid (each isomer), acrylic acid, crotonic acid, isocrotonic acid, vinyl acetic acid, methacrylic acid, angelic acid, tiglic acid, allyl acetic acid, undecenoic acid (each isomer) Saturated or unsaturated aliphatic monocarboxylic acid compounds such as oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, heptanedioic acid (each isomer), octanedioic acid Each isomer), nonanedioic acid (each isomer), decanedioic acid (each isomer), maleic acid, fumaric acid, methylmaleic acid, methylfumaric acid, pentenedioic acid (each isomer), itaconic acid, allylmalonic acid Saturated or unsaturated aliphatic dicarboxylic acid such as 1,2,3-propanetricarboxylic acid, 1,2,3-propenetricarboxylic acid, 2,3-dimethylbutane-1,2,3-tricarboxylic acid, etc. Unsaturated aliphatic tricarboxylic acid compounds, benzoic acid, methylbenzoic acid (each isomer), ethylbenzoic acid (each isomer), propylbenzoic acid (each isomer), dimethylbenzoic acid (each isomer), trimethylbenzoic acid Aromatic carboxylic acid compounds such as (each isomer), aromatic dicarboxylic acid compounds such as phthalic acid, isophthalic acid, terephthalic acid, methyl isophthalic acid (each isomer) Aromatic tricarboxylic acid compounds such as hemimellitic acid, trimellitic acid, trimesic acid, phenol, methyl-phenol (each isomer), ethyl-phenol (each isomer), propyl-phenol (each isomer), butyl-phenol (each Isomer), pentyl-phenol (each isomer), hexyl-phenol (each isomer), heptyl-phenol (each isomer), octyl-phenol (each isomer), nonyl-phenol (each isomer), decyl -Mono-substituted phenols such as phenol (each isomer), dodecyl-phenol (each isomer), phenyl-phenol (each isomer), phenoxyphenol (each isomer), cumyl-phenol (each isomer), dimethyl -Phenol (each isomer), diethyl-phenol (each isomer), dipropyl-phenol (each Isomer), dibutyl-phenol (each isomer), dipentyl-phenol (each isomer), dihexyl-phenol (each isomer), diheptyl-phenol (each isomer), dioctyl-phenol (each isomer), dinonyl -Phenol (each isomer), didecyl-phenol (each isomer), didodecyl-phenol (each isomer), diphenyl-phenol (each isomer), diphenoxyphenol (each isomer), dicumyl-phenol (each isomer) Body) methyl-ethyl-phenol (each isomer), methyl-propyl-phenol (each isomer), methyl-butyl-phenol (each isomer), methyl-pentyl-phenol (each isomer), methyl-hexyl- Phenol (each isomer), methyl-heptyl-phenol (each isomer), methyl-octyl-phenol (Each isomer), methyl-nonyl-phenol (each isomer), methyl-decyl-phenol (each isomer), methyl-dodecyl-phenol (each isomer), methyl-phenyl-phenol (each isomer) ), Methyl-phenoxyphenol (each isomer), methyl-cumyl-phenol (each isomer), ethyl-propyl-phenol (each isomer), ethyl-butyl-phenol (each isomer), ethyl-pentyl-phenol (Each isomer), ethyl-hexyl-phenol (each isomer), ethyl-heptyl-phenol (each isomer), ethyl-octyl-phenol (each isomer), ethyl-nonyl-phenol (each isomer), Ethyl-decyl-phenol (each isomer), ethyl-dodecyl-phenol (each isomer), ethyl-phenyl-phenol Each isomer), ethyl-phenoxyphenol (each isomer), ethyl-cumyl-phenol (each isomer) propyl-butyl-phenol (each isomer), propyl-pentyl-phenol (each isomer), propyl-hexyl -Phenol (each isomer), propyl-heptyl-phenol (each isomer), propyl-octyl-phenol (each isomer), propyl-nonyl-phenol (each isomer), propyl-decyl-phenol (each isomer) ), Propyl-dodecyl-phenol (each isomer), propyl-phenyl-phenol (each isomer), propyl-phenoxyphenol (each isomer), propyl-cumyl-phenol (each isomer) butyl-pentyl-phenol ( Each isomer), butyl-hexyl-phenol (each isomer), butyl-heptyl -Phenol (each isomer), butyl-octyl-phenol (each isomer), butyl-nonyl-phenol (each isomer), butyl-decyl-phenol (each isomer), butyl-dodecyl-phenol (each isomer) ), Butyl-phenyl-phenol (each isomer), butyl-phenoxyphenol (each isomer), butyl-cumyl-phenol (each isomer) pentyl-hexyl-phenol (each isomer), pentyl-heptyl-phenol ( Isomers), pentyl-octyl-phenol (each isomer), pentyl-nonyl-phenol (each isomer), pentyl-decyl-phenol (each isomer), pentyl-dodecyl-phenol (each isomer), pentyl -Phenyl-phenol (each isomer), pentyl-phenoxyphenol (each isomer), pliers -Cumyl-phenol (each isomer) hexyl-heptyl-phenol (each isomer), hexyl-octyl-phenol (each isomer), hexyl-nonyl-phenol (each isomer), hexyl-decyl-phenol (each isomer) ), Hexyl-dodecyl-phenol (each isomer), hexyl-phenyl-phenol (each isomer), hexyl-phenoxyphenol (each isomer), hexyl-cumyl-phenol (each isomer) heptyl-octyl-phenol (Each isomer), heptyl-nonyl-phenol (each isomer), heptyl-decyl-phenol (each isomer), heptyl-dodecyl-phenol (each isomer), heptyl-phenyl-phenol (each isomer), Heptyl-phenoxyphenol (each isomer), heptyl-cumyl-phenol Each isomer) Octyl-nonyl-phenol (each isomer), octyl-decyl-phenol (each isomer), octyl-dodecyl-phenol (each isomer), octyl-phenyl-phenol (each isomer), octyl- Phenoxyphenol (each isomer), octyl-cumyl-phenol (each isomer), nonyl-decyl-phenol (each isomer), nonyl-dodecyl-phenol (each isomer), nonyl-phenyl-phenol (each isomer) , Nonyl-phenoxyphenol (each isomer), nonyl-cumyl-phenol (each isomer) dodecyl-phenyl-phenol (each isomer), dodecyl-phenoxyphenol (each isomer), dodecyl-cumyl-phenol (each isomer) Di-substituted phenols, trimethyl-phenol (each isomer), triethyl Ru-phenol (each isomer), tripropyl-phenol (each isomer), tributyl-phenol (each isomer), tripentyl-phenol (each isomer), trihexyl-phenol (each isomer), triheptyl-phenol ( Each isomer), trioctyl-phenol (each isomer), trinonyl-phenol (each isomer), tridecyl-phenol (each isomer), tridodecyl-phenol (each isomer), triphenyl-phenol (each isomer) , Triphenoxyphenol (each isomer), tricumyl-phenol (each isomer), dimethyl-ethyl-phenol (each isomer), dimethyl-propyl-phenol (each isomer), dimethyl-butyl-phenol (each isomer) ), Dimethyl-pentyl-phenol (each isomer), dimethyl-hexyl Phenol (each isomer), dimethyl-heptyl-phenol (each isomer), dimethyl-octyl-phenol (each isomer), dimethyl-nonyl-phenol (each isomer), dimethyl-decyl-phenol (each isomer) , Dimethyl-dodecyl-phenol (each isomer), dimethyl-phenyl-phenol (each isomer), dimethyl-phenoxyphenol (each isomer), dimethyl-cumyl-phenol (each isomer), diethyl-methyl-phenol ( Each isomer), diethyl-propyl-phenol (each isomer), diethyl-butyl-phenol (each isomer), diethyl-pentyl-phenol (each isomer), diethyl-hexyl-phenol (each isomer), diethyl -Heptyl-phenol (each isomer), diethyl-octyl-phenol (each ), Diethyl-nonyl-phenol (each isomer), diethyl-decyl-phenol (each isomer), diethyl-dodecyl-phenol (each isomer), diethyl-phenyl-phenol (each isomer), diethyl- Phenoxyphenol (each isomer), diethyl-cumyl-phenol (each isomer) dipropyl-methyl-phenol (each isomer), dipropyl-ethyl-phenol (each isomer), dipropyl-butyl-phenol (each isomer) , Dipropyl-pentyl-phenol (each isomer), dipropyl-hexyl-phenol (each isomer), dipropyl-heptyl-phenol (each isomer), dipropyl-octyl-phenol (each isomer), dipropyl-nonyl-phenol (Each isomer), dipropyl-decyl-phenol (each isomer) , Dipropyl-dodecyl-phenol (each isomer), dipropyl-phenyl-phenol (each isomer), dipropyl-phenoxyphenol (each isomer), dipropyl-cumyl-phenol (each isomer) dibutyl-methyl-phenol (each Isomers), dibutyl-ethyl-phenol (each isomer), dibutyl-propyl-phenol (each isomer), dibutyl-pentyl-phenol (each isomer), dibutyl-hexyl-phenol (each isomer), dibutyl- Heptyl-phenol (each isomer), dibutyl-octyl-phenol (each isomer), dibutyl-nonyl-phenol (each isomer), dibutyl-decyl-phenol (each isomer), dibutyl-dodecyl-phenol (each isomer) ), Dibutyl-phenyl-phenol (each isomer), dibutyl Phenoxyphenol (each isomer), dibutyl-cumyl-phenol (each isomer) dipentyl-methyl-phenol (each isomer), dipentyl-ethyl-phenol (each isomer), dipentyl-propyl-phenol (each isomer) , Dipentyl-butyl-phenol (each isomer), dipentyl-hexyl-phenol (each isomer), dipentyl-heptyl-phenol (each isomer), dipentyl-octyl-phenol (each isomer), dipentyl-nonyl-phenol (Each isomer), dipentyl-decyl-phenol (each isomer), dipentyl-dodecyl-phenol (each isomer), dipentyl-phenyl-phenol (each isomer), dipentyl-phenoxyphenol (each isomer), dipentyl -Cumyl-phenol (each isomer) dihex Ru-methyl-phenol (each isomer), dihexyl-ethyl-phenol (each isomer), dihexyl-propyl-phenol (each isomer), dihexyl-butyl-phenol (each isomer), dihexyl-pentyl-phenol ( Each isomer), dihexyl-heptyl-phenol (each isomer), dihexyl-octyl-phenol (each isomer), dihexyl-nonyl-phenol (each isomer), dihexyl-decyl-phenol (each isomer), dihexyl -Dodecyl-phenol (each isomer), dihexyl-phenyl-phenol (each isomer), dihexyl-phenoxyphenol (each isomer), di

Hexyl-cumyl-phenol (each isomer) diheptyl-methyl-phenol (each isomer), diheptyl-ethyl-phenol (each isomer), diheptyl-propyl-phenol (each isomer), diheptyl-butyl-phenol (each Isomers), diheptyl-pentyl-phenol (each isomer), diheptyl-hexyl-phenol (each isomer), diheptyl-octyl-phenol (each isomer), diheptyl-nonyl-phenol (each isomer), diheptyl- Decyl-phenol (each isomer), diheptyl-dodecyl-phenol (each isomer), diheptyl-phenyl-phenol (each isomer), diheptyl-phenoxyphenol (each isomer), diheptyl-cumyl-phenol (each isomer) ) Dioctyl-methyl-phenol (each isomer) Dioctyl-ethyl-phenol (each isomer), dioctyl-propyl-phenol (each isomer), dioctyl-butyl-phenol (each isomer), dioctyl-pentyl-phenol (each isomer), dioctyl-hexyl-phenol ( Each isomer), dioctyl-heptyl-phenol (each isomer), dioctyl-nonyl-phenol (each isomer), dioctyl-decyl-phenol (each isomer), dioctyl-dodecyl-phenol (each isomer), dioctyl -Phenyl-phenol (each isomer), Dioctyl-phenoxyphenol (each isomer), Dioctyl-cumyl-phenol (each isomer), Dinonyl-methyl-phenol (each isomer), Dinonyl-ethyl-phenol (each isomer) ), Dinonyl-propyl-phenol (each isomer) ), Dinonyl-butyl-phenol (each isomer), dinonyl-pentyl-phenol (each isomer), dinonyl-hexyl-phenol (each isomer), dinonyl-heptyl-phenol (each isomer), dinonyl-octyl- Phenol (each isomer), dinonyl-decyl-phenol (each isomer), dinonyl-dodecyl-phenol (each isomer), dinonyl-phenyl-phenol (each isomer), dinonyl-phenoxyphenol (each isomer), Dinonyl-cumyl-phenol (each isomer), didecyl-methyl-phenol (each isomer), didecyl-ethyl-phenol (each isomer), didecyl-propyl-phenol (each isomer), didecyl-butyl-phenol ( Each isomer), didecyl-pentyl-phenol (each isomer), didecyl-hex Sil-phenol (each isomer), didecyl-heptyl-phenol (each isomer), didecyl-octyl-phenol (each isomer), didecyl-nonyl-phenol (each isomer), didecyl-dodecyl-phenol (each isomer) ), Didecyl-phenyl-phenol (each isomer), didecyl-phenoxyphenol (each isomer), didecyl-cumyl-phenol (each isomer), didodecyl-methyl-phenol (each isomer), didodecyl-ethyl- Phenol (each isomer), didodecyl-propyl-phenol (each isomer), didodecyl-butyl-phenol (each isomer), didodecyl-pentyl-phenol (each isomer), didodecyl-hexyl-phenol (each isomer) , Didodecyl-heptyl-phenol (each isomer), didodecyl-oct Ru-phenol (each isomer), didodecyl-nonyl-phenol (each isomer), didodecyl-decyl-phenol (each isomer), didodecyl-dodecyl-phenol (each isomer), didodecyl-phenyl-phenol (each isomer) ), Didodecyl-phenoxyphenol (each isomer), didodecyl-cumyl-phenol (each isomer), diphenyl-methyl-phenol (each isomer), diphenyl-ethyl-phenol (each isomer), diphenyl-propyl- Phenol (each isomer), diphenyl-butyl-phenol (each isomer), diphenyl-pentyl-phenol (each isomer), diphenyl-hexyl-phenol (each isomer), diphenyl-heptyl-phenol (each isomer) , Diphenyl-octyl-phenol (each isomer), diph Nyl-nonyl-phenol (each isomer), diphenyl-decyl-phenol (each isomer), diphenyl-dodecyl-phenol (each isomer), diphenyl-phenoxyphenol (each isomer), diphenyl-cumyl-phenol (each Isomers), diphenoxymethyl-phenol (each isomer), diphenoxyethyl-phenol (each isomer), diphenoxypropyl-phenol (each isomer), diphenoxybutyl-phenol (each isomer), diphenoxy Pentyl-phenol (each isomer), diphenoxyhexyl-phenol (each isomer), diphenoxyheptyl-phenol (each isomer), diphenoxyoctyl-phenol (each isomer), diphenoxynonyl-phenol (each isomer) ), Diphenoxydecyl-phenol (each isomer) , Diphenoxide dodecyl-phenol (each isomer), diphenoxyphenyl-phenol (each isomer), diphenoxycumyl-phenol (each isomer), dicumyl-methyl-phenol (each isomer), dicumyl-ethyl- Phenol (each isomer), Dicumyl-propyl-phenol (each isomer), Dicumyl-butyl-phenol (each isomer), Dicumyl-pentyl-phenol (each isomer), Dicumyl-hexyl-phenol (each isomer) , Dicumyl-heptyl-phenol (each isomer), dicumyl-octyl-phenol (each isomer), dicumyl-nonyl-phenol (each isomer), dicumyl-decyl-phenol (each isomer), dicumyl-dodecyl-phenol (Each isomer), dicumyl-phenyl-phenol (each isomer), dicumyl- Enoxyphenol (each isomer), methyl-ethyl-propyl-phenol (each isomer), methyl-ethyl-butyl-phenol (each isomer), methyl-ethyl-pentyl-phenol (each isomer), methyl -Ethyl-hexyl-phenol (each isomer), methyl-ethyl-heptyl-phenol (each isomer), methyl-ethyl-octyl-phenol (each isomer), methyl-ethyl-nonyl-phenol (each isomer) , Methyl-ethyl-decyl-phenol (each isomer), methyl-ethyl-dodecyl-phenol (each isomer), methyl-ethyl-phenyl-phenol (each isomer), methyl-ethyl-phenoxyphenol (each isomer) ), Methyl-ethyl-cumyl-phenol (isomers), methyl-propyl-methyl-propyl-buty -Phenol (each isomer), methyl-propyl-pentyl-phenol (each isomer), methyl-propyl-hexyl-phenol (each isomer), methyl-propyl-heptyl-phenol (each isomer), methyl-propyl -Octyl-phenol (each isomer), methyl-propyl-nonyl-phenol (each isomer), methyl-propyl-decyl-phenol (each isomer), methyl-propyl-dodecyl-phenol (each isomer), methyl -Propyl-phenyl-phenol (each isomer), methyl-propyl-phenoxyphenol (each isomer), methyl-propyl-cumyl-phenol (each isomer), methyl-butyl-pentyl-phenol (each isomer), Methyl-butyl-hexyl-phenol (isomers), methyl-butyl-heptyl- Phenol (each isomer), methyl-butyl-octyl-phenol (each isomer), methyl-butyl-nonyl-phenol (each isomer), methyl-butyl-decyl-phenol (each isomer), methyl-butyl- Dodecyl-phenol (each isomer), methyl-butyl-phenyl-phenol (each isomer), methyl-butyl-phenoxyphenol (each isomer), methyl-butyl-cumyl-phenol (each isomer), methyl-pentyl -Hexyl-phenol (each isomer), methyl-pentyl-heptyl-phenol (each isomer), methyl-pentyl-octyl-phenol (each isomer), methyl-pentyl-nonyl-phenol (each isomer), methyl -Pentyl-decyl-phenol (each isomer), methyl-pentyl-dodecyl-phenol (each ), Methyl-pentyl-phenyl-phenol (each isomer), methyl-pentyl-phenoxyphenol (each isomer), methyl-pentyl-cumyl-phenol (each isomer), methyl-hexyl-heptyl-phenol ( Each isomer), methyl-hexyl-octyl-phenol (each isomer), methyl-hexyl-nonyl-phenol (each isomer), methyl-hexyl-decyl-phenol (each isomer), methyl-hexyl-dodecyl- Phenol (each isomer), methyl-hexyl-phenyl-phenol (each isomer), methyl-hexyl-phenoxyphenol (each isomer), methyl-hexyl-cumyl-phenol (each isomer), ethyl-propyl-butyl -Phenol (each isomer), ethyl-propyl-pentyl-phenol (each ), Ethyl-propyl-hexyl-phenol (each isomer), ethyl-propyl-heptyl-phenol (each isomer), ethyl-propyl-octyl-phenol (each isomer), ethyl-propyl-nonyl-phenol (Each isomer), ethyl-propyl-decyl-phenol (each isomer), ethyl-propyl-dodecyl-phenol (each isomer), ethyl-propyl-phenyl-phenol (each isomer), ethyl-propyl-phenoxy Phenol (each isomer), ethyl-propyl-cumyl-phenol (each isomer), ethyl-butyl-phenol (each isomer), ethyl-butyl-pentyl-phenol (each isomer), ethyl-butyl-hexyl- Phenol (each isomer), ethyl-butyl-heptyl-phenol (each isomer), ethyl -Butyl-octyl-phenol (each isomer), ethyl-butyl-nonyl-phenol (each isomer), ethyl-butyl-decyl-phenol (each isomer), ethyl-butyl-dodecyl-phenol (each isomer) , Ethyl-butyl-phenyl-phenol (each isomer), ethyl-butyl-phenoxyphenol (each isomer), ethyl-butyl-cumyl-phenol (each isomer), ethyl-pentyl-hexyl-phenol (each isomer) ), Ethyl-pentyl-heptyl-phenol (each isomer), ethyl-pentyl-octyl-phenol (each isomer), ethyl-pentyl-nonyl-phenol (each isomer), ethyl-pentyl-decyl-phenol (each Isomers), ethyl-pentyl-dodecyl-phenol (each isomer), ethyl-pentyl-thiol Nyl-phenol (each isomer), ethyl-pentyl-phenoxyphenol (each isomer), ethyl-pentyl-cumyl-phenol (each isomer), ethyl-hexyl-heptyl-phenol (each isomer), ethyl-hexyl -Octyl-phenol (each isomer), ethyl-hexyl-nonyl-phenol (each isomer), ethyl-hexyl-decyl-phenol (each isomer), ethyl-hexyl-dodecyl-phenol (each isomer), ethyl -Hexyl-phenyl-phenol (each isomer), ethyl-hexyl-phenoxyphenol (each isomer), ethyl-hexyl-cumyl-phenol (each isomer), ethyl-heptyl-octyl-phenol (each isomer), Ethyl-heptyl-nonyl-phenol (each isomer), ethyl-heptyl-de Ru-phenol (each isomer), ethyl-heptyl-dodecyl-phenol (each isomer), ethyl-heptyl-phenyl-phenol (each isomer), ethyl-heptyl-phenoxyphenol (each isomer), ethyl-heptyl -Cumyl-phenol (each isomer), ethyl-octyl-phenol (each isomer), ethyl-octyl-nonyl-phenol (each isomer), ethyl-octyl-decyl-phenol (each isomer), ethyl-octyl -Dodecyl-phenol (each isomer), ethyl-octyl-phenyl-phenol (each isomer), ethyl-octyl-phenoxyphenol (each isomer), ethyl-octyl-cumyl-phenol (each isomer), ethyl- Nonyl-decyl-phenol (each isomer), ethyl-nonyl-dodecyl-phenol (Each isomer), ethyl-nonyl-phenyl-phenol (each isomer), ethyl-nonyl-phenoxyphenol (each isomer), ethyl-nonyl-cumyl-phenol (each isomer), ethyl-decyl-dodecyl- Phenol (each isomer), ethyl-decyl-phenyl-phen

Nord (each isomer), ethyl-decyl-phenoxyphenol (each isomer), ethyl-decyl-cumyl-phenol (each isomer), ethyl-dodecyl-phenyl-phenol (each isomer), ethyl-dodecyl-phenoxy Phenol (each isomer), ethyl-dodecyl-cumyl-phenol (each isomer), ethyl-phenyl-phenoxyphenol (each isomer), ethyl-phenyl-cumyl-phenol (each isomer), propyl-butyl-phenol (Each isomer), propyl-butyl-pentyl-phenol (each isomer), propyl-butyl-hexyl-phenol (each isomer), propyl-butyl-heptyl-phenol (each isomer), propyl-butyl-octyl -Phenol (each isomer), propyl-butyl-nonyl-phenol (each different ), Propyl-butyl-decyl-phenol (each isomer), propyl-butyl-dodecyl-phenol (each isomer), propyl-butyl-phenyl-phenol (each isomer), propyl-butyl-phenoxyphenol (each Isomer), propyl-butyl-cumyl-phenol (each isomer), propyl-pentyl-phenol (each isomer), propyl-pentyl-hexyl-phenol (each isomer), propyl-pentyl-heptyl-phenol (each Isomer), propyl-pentyl-octyl-phenol (each isomer), propyl-pentyl-nonyl-phenol (each isomer), propyl-pentyl-decyl-phenol (each isomer), propyl-pentyl-dodecyl-phenol (Each isomer), propyl-pentyl-phenyl-pheno (Each isomer), propyl-pentyl-phenoxyphenol (each isomer), propyl-pentyl-cumyl-phenol (each isomer), propyl-hexyl-phenol (each isomer), propyl-hexyl-heptyl-phenol ( Isomers), propyl-hexyl-octyl-phenol (each isomer), propyl-hexyl-nonyl-phenol (each isomer), propyl-hexyl-decyl-phenol (each isomer), propyl-hexyl-dodecyl- Phenol (each isomer), propyl-hexyl-phenyl-phenol (each isomer), propyl-hexyl-phenoxyphenol (each isomer), propyl-hexyl-cumyl-phenol (each isomer), propyl-heptyl-octyl -Phenol (each isomer), propyl-heptyl-no Nyl-phenol (each isomer), propyl-heptyl-decyl-phenol (each isomer), propyl-heptyl-dodecyl-phenol (each isomer), propyl-heptyl-phenyl-phenol (each isomer), propyl- Heptyl-phenoxyphenol (each isomer), propyl-heptyl-cumyl-phenol (each isomer), propyl-octyl-nonyl-phenol (each isomer), propyl-octyl-decyl-phenol (each isomer), propyl -Octyl-dodecyl-phenol (each isomer), propyl-octyl-phenyl-phenol (each isomer), propyl-octyl-phenoxyphenol (each isomer), propyl-octyl-cumyl-phenol (each isomer), Propyl-nonyl-decyl-phenol (each isomer), Pyr-nonyl-dodecyl-phenol (each isomer), propyl-nonyl-phenyl-phenol (each isomer), propyl-nonyl-phenoxyphenol (each isomer), propyl-nonyl-cumyl-phenol (each isomer) Propyl-decyl-dodecyl-phenol (each isomer), propyl-decyl-phenyl-phenol (each isomer), propyl-decyl-phenoxyphenol (each isomer), propyl-decyl-cumyl-phenol (each isomer) ), Propyl-dodecyl-phenyl-phenol (each isomer), propyl-dodecyl-phenoxyphenol (each isomer), propyl-dodecyl-cumyl-phenol (each isomer), methyl-phenol (each isomer), ethyl -Phenol (each isomer), propyl-phenol (each isomer) Butyl-phenol (each isomer), pentyl-phenol (each isomer), hexyl-phenol (each isomer), heptyl-phenol (each isomer), octyl-phenol (each isomer), nonyl-phenol (each Isomer), decyl-phenol (each isomer), dodecyl-phenol (each isomer), phenyl-phenol (each isomer), phenoxyphenol (each isomer), cumyl-phenol (each isomer), propyl- Phenyl-phenoxyphenol (each isomer), propyl-phenyl-cumyl-phenol (each isomer), propyl-phenoxycumyl-phenol (each isomer) propyl-butyl-pentyl-phenol (each isomer), propyl- Butyl-hexyl-phenol (each isomer), propyl-butyl-heptyl-phenol ( Isomers), propyl-butyl-octyl-phenol (each isomer), propyl-butyl-nonyl-phenol (each isomer), propyl-butyl-decyl-phenol (each isomer), propyl-butyl-dodecyl- Phenol (each isomer), propyl-butyl-phenyl-phenol (each isomer), propyl-butyl-phenoxyphenol (each isomer), propyl-butyl-cumyl-phenol (each isomer), propyl-pentyl-phenol (Each isomer), propyl-pentyl-hexyl-phenol (each isomer), propyl-pentyl-heptyl-phenol (each isomer), propyl-pentyl-octyl-phenol (each isomer), propyl-pentyl-nonyl -Phenol (each isomer), propyl-pentyl-decyl-phenol Isomers), propyl-pentyl-dodecyl-phenol (each isomer), propyl-pentyl-phenyl-phenol (each isomer), propyl-pentyl-phenoxyphenol (each isomer), propyl-pentyl-cumyl-phenol (Each isomer), propyl-hexyl-heptyl-phenol (each isomer), propyl-hexyl-octyl-phenol (each isomer), propyl-hexyl-nonyl-phenol (each isomer), propyl-hexyl-decyl -Phenol (each isomer), propyl-hexyl-dodecyl-phenol (each isomer), propyl-hexyl-phenyl-phenol (each isomer), propyl-hexyl-phenoxyphenol (each isomer), propyl-hexyl- Cumyl-phenol (each isomer), propyl-he Til-octyl-phenol (each isomer), propyl-heptyl-nonyl-phenol (each isomer), propyl-heptyl-decyl-phenol (each isomer), propyl-heptyl-dodecyl-phenol (each isomer), Propyl-heptyl-phenyl-phenol (each isomer), propyl-heptyl-phenoxyphenol (each isomer), propyl-heptyl-cumyl-phenol (each isomer), propyl-octyl-nonyl-phenol (each isomer) Propyl-octyl-decyl-phenol (each isomer), propyl-octyl-dodecyl-phenol (each isomer), propyl-octyl-phenyl-phenol (each isomer), propyl-octyl-phenoxyphenol (each isomer) ), Propyl-octyl-cumyl-phenol (each Isomer), propyl-nonyl-decyl-phenol (each isomer), propyl-nonyl-dodecyl-phenol (each isomer), propyl-nonyl-phenyl-phenol (each isomer), propyl-nonyl-phenoxyphenol ( Isomers), propyl-nonyl-cumyl-phenol (each isomer), propyl-decyl-dodecyl-phenol (each isomer), propyl-decyl-phenyl-phenol (each isomer), propyl-decyl-phenoxyphenol (Each isomer), propyl-decyl-cumyl-phenol (each isomer), propyl-dodecyl-phenyl-phenol (each isomer), propyl-dodecyl-phenoxyphenol (each isomer), cumyl-phenol (each isomer) ), Propyl-phenyl-phenoxyphenol (each isomer), Propyl-phenyl-cumyl-phenol (each isomer), butyl-pentyl-hexyl-phenol (each isomer), butyl-pentyl-heptyl-phenol (each isomer), butyl-pentyl-octyl-phenol (each isomer) ), Butyl-pentyl-nonyl-phenol (each isomer), butyl-pentyl-decyl-phenol (each isomer), butyl-pentyl-dodecyl-phenol (each isomer), butyl-pentyl-phenyl-phenol (each Isomer), butyl-pentyl-phenoxyphenol (each isomer), butyl-pentyl-cumyl-phenol (each isomer), butyl-hexyl-heptyl-phenol (each isomer), butyl-hexyl-octyl-phenol ( Isomers), butyl-hexyl-nonyl-phenol (each isomer) Butyl-hexyl-decyl-phenol (each isomer), butyl-hexyl-dodecyl-phenol (each isomer), butyl-hexyl-phenyl-phenol (each isomer), butyl-hexyl-phenoxyphenol (each isomer) Butyl-hexyl-cumyl-phenol (each isomer), butyl-heptyl-octyl-phenol (each isomer), butyl-heptyl-nonyl-phenol (each isomer), butyl-heptyl-decyl-phenol (each isomer) ), Butyl-heptyl-dodecyl-phenol (each isomer), butyl-heptyl-phenyl-phenol (each isomer), butyl-heptyl-phenoxyphenol (each isomer), butyl-heptyl-cumyl-phenol (each) Isomers), butyl-octyl-nonyl-phenol (each isomer), Cyl-octyl-decyl-phenol (each isomer), butyl-octyl-dodecyl-phenol (each isomer), butyl-octyl-phenyl-phenol (each isomer), butyl-octyl-phenoxyphenol (each isomer) Butyl-octyl-cumyl-phenol (each isomer), butyl-nonyl-decyl-phenol (each isomer), butyl-nonyl-dodecyl-phenol (each isomer), butyl-nonyl-phenyl-phenol (each isomer) ), Butyl-nonyl-phenoxyphenol (each isomer), butyl-nonyl-cumyl-phenol (each isomer), butyl-decyl-dodecyl-phenol (each isomer), butyl-decyl-phenyl-phenol (each Isomers), butyl-decyl-phenoxyphenol (each isomer), butyl-decyl- Mil-phenol (each isomer), butyl-dodecyl-phenol (each isomer), butyl-dodecyl-phenyl-phenol (each isomer), butyl-dodecyl-phenoxyphenol (each isomer), butyl-dodecyl-cumyl -Phenol (each isomer), butyl-phenyl-phenol (each isomer), butyl-phenyl-phenoxyphenol (each isomer), butyl-phenyl-cumyl-phenol (each isomer), pentyl-hexyl-heptyl- Phenol (each isomer), pentyl-hexyl-octyl-phenol (each isomer), pentyl-hexyl-nonyl-phenol (each isomer), pentyl-hexyl-decyl-phenol (each isomer), pentyl-hexyl- Dodecyl-phenol (each isomer), pentyl-hexyl-phenyl Phenol (each isomer), pentyl-hexyl-phenoxyphenol (each isomer), pentyl-hexyl-cumyl-phenol (each isomer), pentyl-heptyl-octyl-phenol (each isomer), pentyl-heptyl-nonyl -Phenol (each isomer), pentyl-heptyl-decyl-phenol (each isomer), pentyl-heptyl-dodecyl-phenol (each isomer), pentyl-heptyl-phenyl-phenol (each isomer), pentyl-heptyl -Phenoxyphenol (each isomer), pentyl-heptyl-cumyl-phenol (each isomer), pentyl-octyl-nonyl-phenol (each isomer), pentyl-octyl-decyl-phenol (each isomer), pentyl- Octyl-dodecyl-phenol (each isomer), pliers Ru-octyl-phenyl-phenol (each isomer), pentyl-octyl-phenoxyphenol (each isomer), pentyl-octyl-cumyl-phenol (each isomer), pentyl-nonyl-decyl-phenol (each isomer) Pentyl-nonyl-dodecyl-phenol

(Each isomer), pentyl-nonyl-phenyl-phenol (each isomer), pentyl-nonyl-phenoxyphenol (each isomer), pentyl-nonyl-cumyl-phenol (each isomer), pentyl-decyl-dodecyl- Phenol (each isomer), pentyl-decyl-phenyl-phenol (each isomer), pentyl-decyl-phenoxyphenol (each isomer), pentyl-decyl-cumyl-phenol (each isomer), pentyl-decyl-dodecyl -Phenol (each isomer), pentyl-decyl-phenyl-phenol (each isomer), pentyl-decyl-phenoxyphenol (each isomer), pentyl-decyl-cumyl-phenol (each isomer), pentyl-dodecyl- Phenyl-phenol (each isomer), pentyl-dodecyl-phenoxyf Nord (each isomer), pentyl-dodecyl-cumyl-phenol (each isomer), pentyl-phenyl-phenoxyphenol (each isomer), pentyl-phenyl-cumyl-phenol (each isomer), hexyl-heptyl-octyl -Phenol (each isomer), hexyl-heptyl-nonyl-phenol (each isomer), hexyl-heptyl-decyl-phenol (each isomer), hexyl-heptyl-dodecyl-phenol (each isomer), hexyl-heptyl Phenyl-phenol (each isomer), hexyl-heptyl-phenoxyphenol (each isomer), hexyl-heptyl-cumyl-phenol (each isomer), hexyl-octyl-nonyl-phenol (each isomer), hexyl- Octyl-decyl-phenol (each isomer), hexyl- Octyl-dodecyl-phenol (each isomer), hexyl-octyl-phenyl-phenol (each isomer), hexyl-octyl-phenoxyphenol (each isomer), hexyl-octyl-cumyl-phenol (each isomer), hexyl -Nonyl-decyl-phenol (each isomer), hexyl-nonyl-dodecyl-phenol (each isomer), hexyl-nonyl-phenyl-phenol (each isomer), hexyl-nonyl-phenoxyhexyl-decyl-dodecyl-phenol (Each isomer), hexyl-decyl-phenyl-phenol (each isomer), hexyl-decyl-phenoxyphenol (each isomer), hexyl-decyl-cumyl-phenol (each isomer), hexyl-dodecyl-phenyl- Phenol (each isomer), hexyl-dodecyl-sulfur Enoxyphenol (each isomer), hexyl- | dodecyl-cumyl-phenol (each isomer), hexyl-phenyl-phenoxyphenol (each isomer), hexyl-phenyl-cumyl-phenol (each isomer), heptyl -Octyl-nonyl-phenol (each isomer), heptyl-octyl-decyl-phenol (each isomer), heptyl-octyl-dodecyl-phenol (each isomer), heptyl-octyl-phenyl-phenol (each isomer) , Heptyl-octyl-phenoxyphenol (each isomer), heptyl-octyl-cumyl-phenol (each isomer), heptyl-nonyl-decyl-phenol (each isomer), heptyl-nonyl-dodecyl-phenol (each isomer) ), Heptyl-nonyl-phenyl-phenol (each isomer), hep Tyl-nonyl-phenoxyphenol (each isomer), heptyl-nonyl-cumyl-phenol (each isomer), heptyl-decyl-dodecyl-phenol (each isomer), heptyl-decyl-phenyl-phenol (each isomer) , Heptyl-decyl-phenoxyphenol (each isomer), heptyl-decyl-cumyl-phenol (each isomer), heptyl-dodecyl-phenyl-phenol (each isomer), heptyl-dodecyl-phenoxyphenol (each isomer) , Heptyl-dodecyl-cumyl-phenol (each isomer), heptyl-phenyl-phenoxyphenol (each isomer), heptyl-phenyl-cumyl-phenol (each isomer), octyl-nonyl-decyl-phenol (each isomer) ), Octyl-nonyl-dodecyl-phenol (each isomer) ), Octyl-nonyl-phenyl-phenol (each isomer), octyl-nonyl-phenoxyphenol (each isomer), octyl-nonyl-cumyl-phenol (each isomer), octyl-decyl-dodecyl-phenol (each isomer) Octyl-decyl-phenyl-phenol (each isomer), octyl-decyl-phenoxyphenol (each isomer), octyl-decyl-cumyl-phenol (each isomer), octyl-dodecyl-phenyl-phenol (each Isomers), octyl-dodecyl-phenoxyphenol (each isomer), octyl-dodecyl-cumyl-phenol (each isomer), octyl-dodecyl-phenyl-phenol (each isomer), octyl-dodecyl-phenoxyphenol (each) Isomer), octyl-dodecyl-cumyl-fe Octyl-phenyl-phenoxyphenol (each isomer), octyl-phenyl-cumyl-phenol (each isomer), nonyl-decyl-dodecyl-phenol (each isomer), nonyl-decyl- Phenyl-phenol (each isomer), nonyl-decyl-phenoxyphenol (each isomer), nonyl-decyl-cumyl-phenol (each isomer), nonyl-dodecyl-phenyl-phenol (each isomer), nonyl-dodecyl -Phenoxyphenol (each isomer), Nonyl-dodecyl-cumyl-phenol (each isomer), Nonyl-phenyl-phenoxyphenol (each isomer), Nonyl-phenyl-cumyl-phenol (each isomer), Decyl-dodecyl -Phenyl-phenol (each isomer), decyl-dodecyl-phenoxyphenone (Each isomer), decyl-dodecyl-cumyl-phenol (each isomer), decyl-phenyl-phenoxyphenol (each isomer), decyl-phenyl-cumyl-phenol (each isomer), dodecyl-phenyl-phenoxy Examples include phenol (each isomer), dodecyl-phenyl-cumyl-phenol (each isomer), and phenyl-phenoxycumyl-phenol (each isomer). Among these organic acids, in consideration of the effect when the washing solvent remains after washing operation of the thermal decomposition reactor, more preferably an aromatic hydroxy compound, more preferably a reaction between a diaryl carbonate and an amine compound. It is a compound of the same kind as the aromatic hydroxy compound used in 1.

  When an aromatic hydroxy compound is used as the cleaning acid, the standard boiling point of the aromatic hydroxy compound is, from the viewpoint of the cleaning effect, the compound corresponding to the isocyanate generated by the thermal decomposition reaction of the aforementioned aryl carbamate, It preferably has a boiling point difference of 10 ° C. or more from the normal boiling point of the aromatic hydroxy compound produced by the thermal decomposition reaction of aryl carbamate.

As a method of cleaning the pyrolysis reactor using the cleaning solvent, a method of cleaning the pyrolysis reactor by introducing a cleaning solvent from the top of the pyrolysis reactor, and a method of cleaning the pyrolysis reactor at the bottom of the pyrolysis reactor. Various methods such as a method of introducing a cleaning solvent, cooking the cleaning solvent in the thermal decomposition reactor, and cleaning the inside can be used.
The washing operation does not need to be performed every time the thermal decomposition reaction is performed, and can be arbitrarily determined depending on the compound to be used, the operation rate, and the like, and preferably, once in an operation time of 1 hour to 20000 hours, More preferably, the washing operation can be performed once a day to once a year, and more preferably once every one month to a year. The pyrolysis reactor may be provided with a line for introducing a cleaning solvent in the pyrolysis reactor.

  For the purpose of cleaning the thermal decomposition reactor, when performing the thermal decomposition reaction of aryl carbamate, the above-mentioned cleaning solvent can be allowed to coexist in the conditions of the thermal decomposition reaction. This is different from the inert solvent referred to in the prior art (for example, see US Pat. No. 4,081,472). For example, according to the patent document, an inert solvent refers to a compound that does not react with an isocyanate formed by thermal decomposition of a carbamate, whereas, for example, a document (Journal of the American Chemical Society, 64th). Vol. 2229 (1942) describes that urethane is produced by the reaction of an aromatic hydroxy compound and phenyl isocyanate, so that the aromatic hydroxy compound can react with isocyanate. The aromatic hydroxy compound may be mixed and supplied to the pyrolysis reactor when the reaction mixture obtained by the reaction of the diaryl carbonate and the amine compound is transferred to the pyrolysis reactor, or the reaction mixture is supplied. A line for supplying the aromatic hydroxy compound may be provided separately from the line to be supplied.

  The isocyanate obtained by the production method in the present embodiment can be suitably used as a production raw material for polyurethane foam, paints, adhesives and the like. Since the isocyanate can be produced in a high yield without using highly toxic phosgene by the production method in the present embodiment, the present invention is extremely important industrially.

  EXAMPLES Hereinafter, although this invention is demonstrated concretely based on an Example, the scope of the present invention is not limited to these Examples.

<Analysis method>
1) NMR analysis method Apparatus: JNM-A400 FT-NMR system (1) manufactured by JEOL Ltd., Japan (1) Preparation of ¹ H and ¹³ C-NMR analysis samples About 0.3 g of sample solution was weighed and deuterated chloroform A solution in which about 0.7 g (US, Aldrich, 99.8%) and 0.05 g of tetramethyltin (Japan, Wako Pure Chemical Industries, Wako First Grade) as an internal standard substance were added and mixed uniformly. Was used as an NMR analysis sample.
(2) Quantitative analysis method Each standard substance was analyzed, and based on the prepared calibration curve, quantitative analysis of the analysis sample solution was performed.

2) Liquid chromatography analysis method Apparatus: LC-10AT system, manufactured by Shimadzu Corporation, Japan Column: Silica-60 column, manufactured by Tosoh Corporation, Japan, connected in series Developing solvent: Hexane / tetrahydrofuran = 80/20 (volume ratio) Liquid mixture of solvent: 2 mL / min Column temperature: 35 ° C
Detector: R.D. I. (Refractometer)
(1) Sample for liquid chromatography analysis About 0.1 g of sample was weighed, about 1 g of tetrahydrofuran (made by Wako Pure Chemical Industries, Japan, dehydration) and bisphenol A (Japan, Wako Pure Chemical Industries, Ltd.) as an internal standard substance. A solution obtained by adding about 0.02 g of (manufactured, first grade) and mixing uniformly was used as a sample for liquid chromatography analysis.
(2) Quantitative analysis method Each standard substance was analyzed, and based on the prepared calibration curve, quantitative analysis of the analysis sample solution was performed.

3) Gas chromatography analysis method Apparatus: GC-2010 manufactured by Shimadzu Corporation, Japan
Column: DB-1 manufactured by Agilent Technologies, USA
Length 30m, inner diameter 0.250mm, film thickness 1.00μm
Column temperature: After holding at 50 ° C. for 5 minutes, the temperature is raised to 200 ° C. at a heating rate of 10 ° C./min.
After holding at 200 ° C. for 5 minutes, the temperature is raised to 300 ° C. at a temperature rising rate of 10 ° C./min. Detector: FID
(1) Sample for gas chromatography analysis About 0.05 g of sample is weighed, about 1 g of acetone (made by Wako Pure Chemical Industries, Japan, dehydration) and toluene (made by Wako Pure Chemical Industries, Japan) as an internal standard substance. The solution obtained by adding approximately 0.02 g of (dehydrated) and mixing uniformly was used as a sample for liquid chromatography analysis.
(2) Quantitative analysis method Each standard substance was analyzed, and based on the prepared calibration curve, quantitative analysis of the analysis sample solution was performed.

4) Inductively coupled plasma mass spectrometry apparatus: Japan, Seiko Electronics Co., Ltd., SPQ-8000
(1) Inductively coupled plasma mass spectrometry sample About 0.15 g of a sample was incinerated with dilute sulfuric acid and then dissolved in dilute nitric acid.
(2) Quantitative analysis method Analyzes were carried out for each standard substance, and based on the prepared calibration curve, a quantitative analysis of the analysis sample solution was conducted.

[Reference Example 1] Production of diphenyl carbonate / Process (I-1): Production of dialkyltin catalyst In a eggplant-shaped flask having a volume of 3000 mL, 692 g (2.78 mol) of di-n-butyltin oxide and 1-butanol (Japan, 2000 g (27 mol) manufactured by Wako Pure Chemical Industries, Ltd. was added. The flask containing the mixture in the form of a white slurry was attached to an evaporator connected to an oil bath with a temperature controller, a vacuum pump, and a vacuum controller. The evaporator purge valve outlet was connected to a line of nitrogen gas flowing at normal pressure. After the evaporator purge valve was closed and the system was depressurized, the purge valve was gradually opened, and nitrogen was passed through the system to return to normal pressure. The oil bath temperature was set to 126 ° C., the flask was immersed in the oil bath, and the rotation of the evaporator was started. After the evaporator purge valve was opened, the mixture was boiled and heated at atmospheric pressure for about 30 minutes, and then the liquid mixture boiled and distillation of low boiling components started. After maintaining this state for 8 hours, the purge valve was closed, the inside of the system was gradually reduced in pressure, and the remaining low-boiling components were distilled while the pressure in the system was 76 to 54 kPa. After the low boiling component disappeared, the flask was lifted from the oil bath. The reaction solution was a clear solution. Thereafter, the flask was lifted from the oil bath, the purge valve was gradually opened, and the pressure in the system was returned to normal pressure. In the flask, 952 g of a reaction solution was obtained. ^From the analysis results of ¹¹⁹ Sn, ¹ H, ¹³ C-NMR, the product 1,1,3,3-tetra-n-butyl-1,3-di (n-butyloxy) -distaneoxane was converted to di-n-butyltin oxide. A yield of 99% was obtained on the basis. The same operation was repeated 12 times to obtain a total of 11480 g of 1,1,3,3-tetra-n-butyl-1,3-di (n-butyloxy) -distanoxane.

-Process (I-2): Manufacture of dibutyl carbonate Carbonate ester was manufactured in the continuous manufacturing apparatus as shown in FIG. A column reactor having an inner diameter of 151 mm and an effective length of 5040 mm filled with a packing Melapak 750Y (manufactured by Sulzer Chemtech Ltd., Switzerland) was prepared from line 4 in step (I-1) 1, 1, 3, 3-tetra-n-butyl-1,3-di (n-butyloxy) -distaneoxane 4201 g / hr, 1-butanol purified by distillation column 101 from line 2 is supplied to column reactor 102 at 24717 g / hr. did. The inside of the reactor was adjusted by a heater and reboiler 112 so that the liquid temperature was 160 ° C., and was adjusted by a pressure control valve so that the pressure was about 150 kPa-G. The residence time in the reactor was about 10 minutes. From the top of the reactor, 1-butanol containing 24715 g / hr containing water via line 6 and 1-butanol 824 g / hr via line 1 were charged with the charge Metal Gause CY (Sulzer Chemtech Ltd., Switzerland) and reboiler. The product was transported to a distillation column 101 equipped with 111 and a condenser 121 and purified by distillation. In the upper part of the distillation column 101, a fraction containing high-concentration water was condensed by the condenser 121 and recovered from the line 3. Purified 1-butanol was transported via line 2 at the bottom of distillation column 101. Alkyl tin containing di-n-butyltin-di-n-butoxide and 1,1,3,3-tetra-n-butyl-1,3-di (n-butyloxy) -distanoxane from the bottom of the column reactor 102 An alkoxide catalyst composition was obtained and supplied to the thin film evaporator 103 (manufactured by Shinko Environmental Solution Co., Ltd.) via line 5. 1-Butanol was distilled off in the thin film evaporator 103 and returned to the column reactor 102 via the condenser 123, line 8 and line 4. The alkyltin alkoxide catalyst composition is transported from the lower part of the thin film evaporator 103 via the line 7, and dibutyltin dibutoxide and 1,1,3,3-tetra-n-butyl-1,3-di (n-butyloxy)- The flow rate of the active ingredient of distannoxane was adjusted so as to be about 4812 g / hr and supplied to the autoclave 104. Carbon dioxide was supplied to the autoclave through line 9 at 973 g / hr, and the internal pressure of the autoclave was maintained at 4 MPa-G. The temperature in the autoclave was set to 120 ° C., the residence time was adjusted to about 4 hours, and the carbon dioxide and the alkyltin alkoxide catalyst composition were reacted to obtain a reaction liquid containing dibutyl carbonate. The reaction solution was transferred to the decarburization tank 105 through the line 10 and the control valve to remove residual carbon dioxide, and carbon dioxide was recovered from the line 11. Thereafter, the reaction solution is transported through a line 12 to a thin film evaporation apparatus 106 (manufactured by Shinko Environmental Solution Co., Ltd.) at 140 ° C. and about 1.4 kPa, and 1,1,3,3-tetra-n- The flow rate of butyl-1,3-di (n-butyloxy) -distanoxane was adjusted and supplied so that the flow rate was about 4201 g / hr to obtain a fraction containing dibutyl carbonate, while the evaporation residue was connected to lines 13 and 4 Then, the flow rate of 1,1,3,3-tetra-n-butyl-1,3-di (n-butyloxy) -distaneoxane is adjusted to about 4201 g / hr and circulated to the column reactor 102. A fraction containing dibutyl carbonate is charged via a condenser 126 and a line 14 into a distillation column 107 equipped with a metal gauze CY (manufactured by Sulzer Chemtech Ltd., Switzerland) and equipped with a reboiler 117 and a condenser 127. After supplying by hr and performing distillation purification, 814 g / hr of 99 wt% dibutyl carbonate was obtained from the line 15. The alkyl tin alkoxide catalyst composition in line 13 was analyzed by ¹¹⁹ Sn, ¹ H, ¹³ C-NMR. As a result, 1,1,3,3-tetra-n-butyl-1,3-di (n-butyloxy ) -Distaneoxane was included, and di-n-butyltin-di-n-butoxide was not included. After performing the above continuous operation for about 600 hours, the 1,1,3,3-tetra-produced alkyltin alkoxide catalyst composition from the line 16 at 16 g / hr, while the line 17 was produced in the step (I-1). n-Butyl-1,3-di (n-butyloxy) -distaneoxane was fed at 16 g / hr.

Step (I-3): Production of aromatic carbonate [catalyst preparation]
79 g of phenol and 32 g of lead monoxide were heated at 180 ° C. for 10 hours, and water produced was distilled off together with phenol. About 2.5 g of water was extracted in 10 hours. Thereafter, phenol was distilled off from the upper part of the reactor to prepare a catalyst.
[Production of aromatic carbonate]
An apparatus as shown in FIG. 2 was used.
Dixon packing (6 mmφ) packed into the middle stage of continuous multistage distillation column 202 having an inner diameter of about 5 cm and a column length of 2 m, and a mixed liquid comprising dibutyl carbonate obtained in step (I-2), phenol, and the catalyst prepared above (Prepared so that the weight ratio of dibutyl carbonate and phenol in the mixed solution is about 65/35, and the lead concentration is about 1% by weight), the liquid is passed through the preheater 201 at about 270 g / hr from the line 21. The reaction was carried out by feeding continuously. The amount of heat required for the reaction and distillation was supplied by circulating the liquid at the bottom of the column through line 23 and reboiler 204. The liquid temperature at the bottom of continuous multistage distillation column 202 was 238 ° C., the top pressure was about 250 kPa, and the reflux ratio was about 2. The gas distilled from the top of the continuous multistage distillation column 202 was extracted from the line 22 and was continuously extracted from the line 24 to the storage tank 205 at a rate of about 67 g / hr via the condenser 203. From the bottom of the tower, it was continuously extracted into the storage tank 206 via the line 23 at a rate of about 204 g / hr.
The composition of the liquid extracted from the line 24 was about 33% by weight of 1-butanol, about 65% by weight of phenol, and about 2% by weight of dibutyl carbonate. The composition of the liquid extracted into the storage tank 206 was about 11% by weight of phenol, about 60% by weight of dibutyl carbonate, about 26% by weight of butyl phenyl carbonate, about 1.6% by weight of diphenyl carbonate, and about 1% by weight of lead. It was.
Next, an apparatus as shown in FIG. 3 was used.
The liquid withdrawn into the storage tank 206 in the middle stage of the continuous multistage distillation column 302 having an inner diameter of 5 cm and a column length of 2 m packed with Dickson packing (6 mmφ) is passed through the preheater 301 and is liquid at a rate of about 203 g / hr from the line 31. Feed continuously. The amount of heat required for the reaction and distillation was supplied by circulating the column bottom liquid through line 33 and reboiler 304. The liquid temperature at the bottom of continuous multistage distillation column 302 was 240 ° C., the pressure at the top of the column was about 27 kPa, and the reflux ratio was about 2. The gas distilled from the top of the continuous multistage distillation column 302 was condensed in the condenser 303 via the line 32 and continuously extracted from the line 34 to the storage tank 305 at about 165 g / hr. From the bottom of the tower, it was continuously extracted at a rate of about 39 g / hr to the storage tank 306 via the line 33.
The composition of the liquid extracted from the line 34 was about 500 ppm of 1-butanol, about 13% by weight of phenol, about 85% by weight of dibutyl carbonate, and about 2% by weight of butyl phenyl carbonate. The composition of the liquid extracted into the storage tank 306 was about 0.3% by weight of dibutyl carbonate, about 32% by weight of butyl phenyl carbonate, about 61% by weight of diphenyl carbonate, and about 7% by weight of lead.

[Recycling alcohol]
The apparatus shown in FIG. 4 was used to recycle alcohol.
The liquid continuously extracted from the bottom of the continuous multistage distillation column 402 having an inner diameter of about 5 cm and a column length of 2 m packed with Dickson packing (6 mmφ) to the level of about 0.7 m from the storage tank 205 in the above-described step is line 41. And then through a preheater 401, it was continuously fed at about 201 g / hr to carry out distillation separation. The amount of heat required for the distillation separation was supplied by circulating the column bottom liquid through line 43 and reboiler 404. The liquid temperature at the bottom of continuous multistage distillation column 402 was 145 ° C., the top pressure was about 13 kPa, and the reflux ratio was about 0.3. The gas distilled from the continuous multistage distillation column 402 was condensed in the condenser 403 via the line 42 and extracted from the line 44 to the storage tank 405 at about 68 g / hr. From the bottom of the tower, it was continuously extracted at about 133 g / hr to the storage tank 406 via the line 43.
The composition of the liquid extracted from the line 44 was about 99% by weight of 1-butanol and about 100 ppm of phenol. The composition of the liquid extracted into the storage tank 406 was about 2% by weight of dibutyl carbonate and about 98% by weight of phenol.

[Purification of diaryl carbonate]
The apparatus as shown in FIGS. 5 and 6 was used to purify the diaryl carbonate.
The liquid extracted into the storage tank 306 is continuously fed from the line 51 through the preheater 501 to the middle stage of the continuous multistage distillation column 502 having an inner diameter of about 5 cm and a column length of 2 m packed with Dickson packing (6 mmφ), and continuously at a rate of 195 g / hr. To feed. The amount of heat required for the distillation separation was supplied by circulating the column bottom liquid through line 53 and reboiler 504. The liquid temperature at the bottom of continuous multistage distillation column 502 was 210 ° C., the pressure at the top of the column was about 1.5 kPa, and the reflux ratio was about 1. The gas distilled from the top of the continuous multistage distillation column 502 was condensed in the condenser 503 via the line 52 and continuously extracted from the line 54. From the bottom of the tower, it was extracted at about 14 g / hr into the storage tank 506 via the line 53.
The composition of the liquid extracted from the line 54 was about 0.3% by weight of dibutyl carbonate, about 34% by weight of butyl phenyl carbonate, and about 66% by weight of diphenyl carbonate.
The liquid extracted from the line 54 is continuously passed through the preheater 601 from the line 61 to the middle stage of a continuous multistage distillation column 602 having an inner diameter of about 5 cm and a column length of 2 m packed with Dickson packing (6 mmφ), and continuously at a rate of 181 g / hr. To feed. The amount of heat required for the distillation separation was supplied by circulating the column bottom liquid through line 63 and reboiler 604. The liquid temperature at the bottom of the continuous multistage distillation column 602 was 232 ° C., the pressure at the top of the column was about 15 kPa, and the reflux ratio was about 2. The gas distilled from the top of the continuous multistage distillation column 602 was condensed in the condenser 603 via the line 62 and continuously extracted from the line 64. From the bottom of the tower, it was extracted at about 119 g / hr through the line 63 into the storage tank 606.
The composition of the liquid extracted from the line 64 was about 0.6% by weight of dibutyl carbonate, about 99% by weight of butyl phenyl carbonate, and about 0.4% by weight of diphenyl carbonate. The composition of the liquid extracted into the storage tank 606 was 0.1% by weight of butyl phenyl carbonate and about 99.9% by weight of diphenyl carbonate. The diphenyl carbonate contained 22 ppm of iron as a metal component.

[Example 1]
Step (1-1): Production of N, N′-hexanediyl-bis-carbamic acid diphenyl ester The reaction was carried out using an apparatus as shown in FIG.
In a state where the line 74 is closed, 1350 g (6.3 mol) of diphenyl carbonate of Reference Example 1 is supplied from the storage tank 701 through the line 71 to a 5 L SUS reaction vessel 704 with baffle and phenol (manufactured by Aldrich, USA). 987 g (10.5 mol) was supplied from the storage tank 702 via the line 72 to the SUS reactor. The liquid temperature in the reactor 704 is adjusted to about 50 ° C., and 244 g (2.1 mol) of hexamethylenediamine (manufactured by Aldrich, USA) is supplied from the storage tank 703 via the line 73 to the reactor 704 at about 200 g / hr. Supplied.
As a result of analyzing the solution after the reaction by liquid chromatography, N, N′-hexanediyl-bis-carbamic acid diphenyl ester was produced in a yield of 99.5%.
The line 74 was opened, and the reaction solution was transferred to the storage tank 705 via the line 74.
Step (1-2): Production of isocyanate by thermal decomposition of N, N′-hexanediyl-bis-carbamic acid diphenyl ester The reaction was carried out using an apparatus as shown in FIG.
A thin film distillation apparatus 801 having a heat transfer area of 0.1 m ² (manufactured by Shinko Environmental Solution Co., Ltd., Japan) was heated to 220 ° C., and the internal pressure was set to about 13 kPa. The mixture collected in the storage tank 705 in the step (1-1) was heated to 150 ° C. and supplied to the upper portion of the thin film distillation apparatus 801 through the line 81 at about 800 g / hr. The liquid phase component was extracted from the bottom of the thin film distillation apparatus 801 through the line 83 and circulated to the upper part of the thin film distillation apparatus 801 through the line 84 and the line 81. Gas phase components were extracted from line 82.
The gas phase component extracted from the thin film distillation apparatus 801 via the line 82 is continuously fed to the middle stage of the continuous multistage distillation column 802 having an inner diameter of about 5 cm and a column length of 2 m packed with Dickson packing (6 mmφ). Was separated by distillation. The amount of heat required for the distillation separation was supplied by circulating the column bottom liquid through line 86 and reboiler 804. The liquid temperature at the bottom of continuous multistage distillation column 802 was 150 ° C., and the pressure at the top of the column was about 15 kPa. The gas distilled from the top of the continuous multistage distillation column 802 was condensed in the condenser 803 via the line 85 and continuously extracted from the line 87. A liquid phase component was extracted from a line 89 at a position lower than the line 82 of the continuous multistage distillation column 802.
The liquid phase component extracted from the line 89 is continuously fed to the middle stage of a continuous multistage distillation column 805 having an inner diameter of about 5 cm and a column length of 2 m packed with Dickson packing (6 mmφ), and the liquid phase component is separated by distillation. I did it. The amount of heat required for the distillation separation was supplied by circulating the column bottom liquid through line 91 and reboiler 807. The liquid temperature at the bottom of continuous multistage distillation column 805 was 150 ° C., and the pressure at the top of the column was about 1.5 kPa. The gas distilled from the top of the continuous multistage distillation column 805 was condensed in the condenser 806 via the line 90 and continuously extracted into the storage tank 809 via the line 92. The extraction amount in a steady state was about 104 g / hr.
In the steady state, the liquid phase component was extracted from the line 94 to the storage tank 810 at about 140 g / hr. The liquid phase component contained about 97% by weight of diphenyl carbonate.
The liquid extracted from the line 92 was a solution containing about 99.8% by weight of hexamethylene diisocyanate. The yield based on hexamethylenediamine was 95.3%.
Step (1-3): Recycling of Diaryl Carbonate Diaryl carbonate was recycled using an apparatus as shown in FIGS.
In the step (1-2), the liquid extracted from the line 94 is passed through the preheater 901 from the line 95 to the middle stage of the continuous multistage distillation column 902 having an inner diameter of about 5 cm and a column length of 2 m packed with Dickson packing (6 mmφ). Feeding was continued at about 195 g / hr. The amount of heat required for the distillation separation was supplied by circulating the column bottom liquid through line 97 and reboiler 904. The liquid temperature at the bottom of the continuous multistage distillation column 902 was 210 ° C., the pressure at the top of the column was about 1.5 kPa, and the reflux ratio was about 1. The gas distilled from the top of the continuous multistage distillation column 902 was condensed in the condenser 903 via the line 96 and continuously extracted from the line 99. From the bottom of the tower, it was extracted through a line 97 into a storage tank 906 at about 14 g / hr.
The liquid extracted from the line 99 is continuously supplied at about 181 g / hr from the line A1 through the preheater 1001 to the middle stage of the continuous multistage distillation column 1002 filled with Dickson packing (6 mmφ) and having an inner diameter of about 5 cm and a column length of 2 m. To feed. The amount of heat required for the distillation separation was supplied by circulating the column bottom liquid through line A3 and reboiler 1004. The liquid temperature at the bottom of the continuous multistage distillation column 1002 was 232 ° C., the pressure at the top of the column was about 15 kPa, and the reflux ratio was about 2. The gas distilled from the top of continuous multistage distillation column 1002 was condensed in condenser 1003 via line A2 and continuously extracted from line A4. From the bottom of the tower, it was extracted at about 119 g / hr into the storage tank 1006 via the line A3. The liquid extracted into the storage tank 1006 contained about 99.9% by weight of diphenyl carbonate.
-Step (1-4): Recycling of phenol Recycling of phenol was performed using an apparatus as shown in FIG.
In the step (1-2), the liquid extracted from the line 87 is passed through the preheater 1101 from the line B1 to the middle stage of a continuous multistage distillation column 1102 having an inner diameter of about 5 cm and a column length of 2 m packed with Dickson packing (6 mmφ). Feeding was continuously performed at about 200 g / hr. The amount of heat required for the distillation separation was supplied by circulating the column bottom liquid through line B3 and reboiler 1104. The liquid temperature at the bottom of continuous multistage distillation column 1102 was 230 ° C., the top pressure was atmospheric pressure, and the reflux ratio was about 1. The gas distilled from the top of the continuous multistage distillation column 1102 was condensed in the condenser 1103 via the line B2 and continuously extracted from the line A4 to the storage tank 1105. The liquid extracted into the storage tank 1105 contained about 99.9% by weight of phenol. Although continuous operation was carried out for 10 days, no accumulation of deposits was observed on the wall surface of the thin film distillation apparatus 801. When the operation was continued for 300 days, accumulation of deposits was observed on the wall surface of the thin film distillation apparatus 801.

[Example 2]
Step (2-1): Production of 3- (phenoxycarbonylamino-methyl) -3,5,5-trimethylcyclohexylcarbamic acid phenyl ester The reaction was carried out using an apparatus as shown in FIG.
With the line 74 closed, 1992 g (9.3 mol) of diphenyl carbonate of Reference Example 1 was supplied from the storage tank 701 through the line 71 to the reaction vessel 704 with baffle having an internal volume of 5 L, and 1311 g (14.0 mol) of phenol. Was supplied from the storage tank 702 via the line 72 to the SUS reactor. The temperature of the liquid in the reactor 704 is adjusted to about 50 ° C., and 528 g (3.1 mol) of 3-aminomethyl-3,5,5-trimethylcyclohexylamine (manufactured by Aldrich, USA) is connected to Then, it was supplied to the reactor 704 at about 250 g / hr.
As a result of analyzing the solution after the reaction by liquid chromatography, 3- (phenoxycarbonylamino-methyl) -3,5,5-trimethylcyclohexylcarbamic acid phenyl ester was produced in a yield of 99.3%.
The line 74 was opened, and the reaction solution was transferred to the storage tank 705 via the line 74.
Step (2-2): Production of isocyanate by thermal decomposition of 3- (phenoxycarbonylamino-methyl) -3,5,5-trimethylcyclohexylcarbamic acid phenyl ester Reaction was carried out using an apparatus as shown in FIG. It was.
A thin film distillation apparatus 801 having a heat transfer area of 0.1 m ² (manufactured by Shinko Environmental Solution Co., Ltd., Japan) was heated to 220 ° C., and the internal pressure was set to about 13 kPa. The mixture collected in the storage tank 705 in the step (2-1) was heated to 150 ° C. and supplied to the upper portion of the thin film distillation apparatus 801 through the line 81 at about 780 g / hr. The liquid phase component was extracted from the bottom of the thin film distillation apparatus 801 through the line 83 and circulated to the upper part of the thin film distillation apparatus 801 through the line 84 and the line 81. Gas phase components were extracted from line 82.
The gas phase component extracted from the thin film distillation apparatus 801 via the line 82 is continuously fed to the middle stage of the continuous multistage distillation column 802 having an inner diameter of about 5 cm and a column length of 2 m packed with Dickson packing (6 mmφ). Was separated by distillation. The amount of heat required for the distillation separation was supplied by circulating the column bottom liquid through line 86 and reboiler 804. The liquid temperature at the bottom of continuous multistage distillation column 802 was 150 ° C., and the pressure at the top of the column was about 15 kPa. The gas distilled from the top of the continuous multistage distillation column 802 was condensed in the condenser 803 via the line 85 and continuously extracted from the line 87. A liquid phase component was extracted from a line 89 at a position lower than the line 82 of the continuous multistage distillation column 802.
The liquid phase component extracted from the line 89 is continuously fed to the middle stage of a continuous multistage distillation column 805 having an inner diameter of about 5 cm and a column length of 2 m packed with Dickson packing (6 mmφ), and the liquid phase component is separated by distillation. I did it. The amount of heat required for the distillation separation was supplied by circulating the column bottom liquid through line 91 and reboiler 807. The liquid temperature at the bottom of continuous multistage distillation column 805 was 150 ° C., and the pressure at the top of the column was about 1.3 kPa. The gas distilled from the top of the continuous multistage distillation column 805 was condensed by a condenser 806 via a line 90 and continuously extracted at a storage tank 809 of about 134 g / hr via a line 92.
The liquid extracted from the line 92 was a solution containing about 99.8% by weight of isophorone diisocyanate. The yield based on 3-aminomethyl-3,5,5-trimethylcyclohexylamine was 95.0%. Although continuous operation was carried out for 10 days, no accumulation of deposits was observed on the wall surface of the thin film distillation apparatus 801.

[Example 3]
Step (3-1): Production of diphenyl-4,4′-methylene-dicyclohexyl carbamate To diphenyl carbonate in Reference Example 1, acetylacetonatoiron (II) is added, and 2.3% iron is contained as a metal atom. Diphenyl carbonate was prepared.
The reaction was carried out using an apparatus as shown in FIG.
With the line 74 closed, 1577 g (7.4 mol) of diphenyl carbonate is supplied from the storage tank 701 to the SUS reaction vessel 704 with a baffle having an internal volume of 5 L via the line 71, and 1189 g (12.7 mol) of phenol is supplied from the storage tank 702. This was supplied to the SUS reactor via line 72. The liquid temperature in the reactor 704 was adjusted to about 50 ° C., and 484 g (2.3 mol) of 4,4′-methylenebis (cyclohexylamine) (Aldrich, USA) was passed from the storage tank 703 through the line 73 to the reactor. 704 was fed at about 250 g / hr.
As a result of analyzing the solution after the reaction by liquid chromatography, diphenyl-4,4′-methylene-dicyclohexyl carbamate was produced in a yield of 99.1%.
The line 74 was opened, and the reaction solution was transferred to the storage tank 705 via the line 74.
Step (3-2): Production of isocyanate by thermal decomposition of diphenyl-4,4′-methylene-dicyclohexyl carbamate The reaction was carried out using an apparatus as shown in FIG.
A thin-film distillation apparatus 1201 (manufactured by Shinko Environmental Solution Co., Ltd., Japan) having a heat transfer area of 0.1 m ² was heated to 250 ° C., and the internal pressure was set to about 1.3 kPa. The mixture collected in the storage tank 705 in the step (3-1) was heated to 170 ° C. and supplied to the upper part of the thin film distillation apparatus 1201 at about 650 g / hr via the line C1. The liquid phase component was extracted from line C3 from the bottom of thin film distillation apparatus 1201, and circulated through line C4 and line C1 to the upper part of thin film distillation apparatus 1201. The gas phase component was extracted from line C2.
The gas phase component extracted from the thin film distillation apparatus 1201 via the line C2 is continuously fed to the middle stage of the continuous multistage distillation column 1202 having an inner diameter of about 5 cm and a column length of 2 m packed with Dickson packing (6 mmφ). Distillation separation was performed. The amount of heat required for the distillation separation was supplied by circulating the column bottom liquid through line 86 and reboiler 804. The liquid temperature at the bottom of the continuous multistage distillation column 1201 was 210 ° C., and the pressure at the top of the column was atmospheric pressure. The gas distilled from the top of the continuous multistage distillation column 1201 was condensed in the condenser 1203 via the line C5 and continuously extracted from the line C7. The liquid phase component was extracted from line C8.
The liquid phase component extracted from the line C8 is continuously fed to the middle stage of a continuous multistage distillation column 1205 having an inner diameter of about 5 cm and a column length of 2 m packed with Dickson packing (6 mmφ), and the liquid phase component is separated by distillation. I did it. The amount of heat required for the distillation separation was supplied by circulating the column bottom liquid through line C11 and reboiler 1207. The liquid temperature at the bottom of continuous multistage distillation column 1205 was 210 ° C., and the pressure at the top of the column was about 2.5 kPa. A gas distilled from the top of the continuous multistage distillation column 1205 was condensed by a condenser 1206 via a line C10 and continuously extracted via a line C12. The liquid phase component was extracted from line C14.
The liquid phase component extracted from the line C14 is continuously fed to the middle stage of a continuous multistage distillation column 1208 having an inner diameter of about 5 cm and a column length of 2 m packed with Dickson packing (6 mmφ), and the liquid phase component is separated by distillation. I did it. The amount of heat required for distillation separation was supplied by circulating the column bottom liquid through line C16 and reboiler 1210. The liquid temperature at the bottom of continuous multistage distillation column 1208 was 220 ° C., and the pressure at the top of the column was about 0.5 kPa. The gas distilled from the top of the continuous multistage distillation column 1205 was condensed by the condenser 1209 via the line C15 and continuously extracted at about 113 g / hr via the line C17. The liquid extracted from C17 contained about 99.9% by weight of 4,4′-methylene-bis (cyclohexyl isocyanate). The yield based on 4,4′-methylenebis (cyclohexylamine) was 93.2%. Although continuous operation was carried out for 10 days, accumulation of deposits was not observed on the wall surface of the thin-film distillation apparatus 1202.

[Example 4]
Step (4-1): Production of diphenyl-4,4′-methylene-dicyclohexylcarbamate 1650 g (7.7 mol) of diphenyl carbonate of Reference Example 1, 2,6-dimethylphenol (manufactured by Aldrich, USA) instead of phenol ) 1344 g (11.0 mol) and 4,4′-methylenebis (cyclohexylamine) 463 g (2.2 mol) were supplied, and the same method as in step (3-1) of Example 3 was performed. As a result of analyzing the solution after the reaction by liquid chromatography, diphenyl-4,4′-methylene-dicyclohexyl carbamate was produced in a yield of 99.3%.
Step (4-2): Production of isocyanate by thermal decomposition of diphenyl-4,4′-methylene-dicyclohexyl carbamate Instead of the mixture obtained in step (3-1), obtained in step (4-1) The same method as in step (3-2) of Example 3 was performed except that the mixture was used and the mixture was heated to 140 ° C. A mixture of phenol and 2,6-dimethylphenol was extracted from C7. The liquid extracted from C17 contained about 99.9% by weight of 4,4′-methylene-bis (cyclohexyl isocyanate). The yield based on 4,4′-methylenebis (cyclohexylamine) was 92.3%. Although continuous operation was carried out for 10 days, accumulation of deposits was not observed on the wall surface of the thin-film distillation apparatus 1202.

[Example 5]
Step (5-1): Production of N, N′-hexanediyl-bis-carbamic acid diphenyl ester 1874 g (8.8 mol) of diphenyl carbonate of Reference Example 1, 1246 (13.3 mol) of phenol 1291 and 291 g of hexamethylenediamine ( Except for supplying 2.5 mol), the same method as in step (1-1) of Example 1 was performed.
As a result of analyzing the solution after the reaction by liquid chromatography, N, N′-hexanediyl-bis-carbamic acid diphenyl ester was produced in a yield of 99.4%.
Step (5-2): Production of isocyanate by thermal decomposition of N, N′-hexanediyl-bis-carbamic acid diphenyl ester Instead of the mixture obtained in step (1-1), step (5-1) The same method as in step (1-2) of Example 1 was performed except that the mixture obtained in the above was used, the mixture was heated to 190 ° C. and supplied to the thin film distillation apparatus 801. The liquid was continuously extracted from the line 92 to the storage tank 809 at about 76.5 g / hr. The liquid extracted from the line 92 was a solution containing about 99.8% by weight of hexamethylene diisocyanate. The yield based on hexamethylenediamine was 77.5%. Although continuous operation was carried out for 10 days, no accumulation of deposits was observed on the wall surface of the thin film distillation apparatus 801.

[Example 6]
Step (6-1): Production of N, N′-hexanediyl-bis-carbamic acid diphenyl ester 2056 g (9.6 mol) of diphenyl carbonate in Reference Example 1, 1504 g (16.0 mol) of phenol and 372 g of hexamethylenediamine ( Except for supplying 3.2 mol), the same method as in step (1-1) of Example 1 was performed.
As a result of analyzing the solution after the reaction by liquid chromatography, N, N′-hexanediyl-bis-carbamic acid diphenyl ester was produced in a yield of 99.4%.
Step (6-2): Production of isocyanate by thermal decomposition of N, N′-hexanediyl-bis-carbamic acid diphenyl ester The reaction was carried out using an apparatus as shown in FIG.
A thin film distillation apparatus 801 having a heat transfer area of 0.1 m ² was heated to 220 ° C., and the internal pressure was set to about 0.13 kPa. The mixture collected in the storage tank 705 in the step (6-1) was heated to 100 ° C. and supplied to the upper portion of the thin film distillation apparatus 801 through the line 81 at about 800 g / hr. A gas phase component was extracted from the thin film distillation apparatus 801 through a line 82. From the line 83 provided at the bottom of the thin film distillation apparatus 801, almost no liquid phase component was recovered.
The gas phase component extracted from the thin film distillation apparatus 801 via the line 82 is continuously fed to the middle stage of the continuous multistage distillation column 802 having an inner diameter of about 5 cm and a column length of 2 m packed with Dickson packing (6 mmφ). Was separated by distillation. The amount of heat required for the distillation separation was supplied by circulating the column bottom liquid through line 86 and reboiler 804. The liquid temperature at the bottom of continuous multistage distillation column 802 was 150 ° C., and the pressure at the top of the column was about 8 kPa. The gas distilled from the top of the continuous multistage distillation column 802 was condensed in the condenser 803 via the line 85 and continuously extracted from the line 87. A liquid phase component was extracted from a line 89 at a position lower than the line 82 of the continuous multistage distillation column 802.
The liquid phase component extracted from the line 89 is continuously fed to the middle stage of a continuous multistage distillation column 805 having an inner diameter of about 5 cm and a column length of 2 m packed with Dickson packing (6 mmφ), and the liquid phase component is separated by distillation. I did it. The amount of heat required for the distillation separation was supplied by circulating the column bottom liquid through line 91 and reboiler 807. The liquid temperature at the bottom of continuous multistage distillation column 805 was 150 ° C., and the pressure at the top of the column was about 1.5 kPa. The gas distilled from the top of the continuous multistage distillation column 805 was condensed in the condenser 806 via the line 90 and continuously extracted into the storage tank 809 via the line 92. The extraction amount in a steady state was about 104 g / hr.
The liquid extracted from the line 92 was a solution containing about 99.9% by weight of hexamethylene diisocyanate. The yield based on hexamethylenediamine was 95.4%. When continuous operation was performed for 10 days, accumulation of deposits was observed on the wall surface of the thin film distillation apparatus 801.

[Example 7]
Step (7-1): Production of diphenyl-4,4′-methylene-dicyclohexylcarbamate 1874 g (8.8 mol) of diphenyl carbonate of Reference Example 1, 1175 g (12.5 mol) of phenol and 4,4′-methylenebis (cyclohexyl) The same method as in step (3-1) of Example 3 was carried out except that 526 g (2.5 mol) of amine) was used.
As a result of analyzing the solution after the reaction by liquid chromatography, diphenyl-4,4′-methylene-dicyclohexyl carbamate was produced in a yield of 99.2%.
Step (7-2): Production of isocyanate by thermal decomposition of diphenyl-4,4′-methylene-dicyclohexyl carbamate The reaction was carried out using an apparatus as shown in FIG.
The mixture recovered in the storage tank 705 in step (7-1) is heated to 150 ° C. in the middle stage of a continuous multistage distillation column 1301 having an inner diameter of about 5 cm and a column length of 2 m packed with Dickson packing (6 mmφ), A thermal decomposition reaction was carried out by feeding at about 510 g / hr. The amount of heat required for the pyrolysis reaction was supplied by circulating the column bottom liquid through line D3 and reboiler 1303. The liquid temperature at the bottom of the continuous multistage distillation column 1301 was 220 ° C., and the pressure at the top of the column was about 15 kPa. The gas distilled from the top of the continuous multistage distillation column 1301 was condensed in the condenser 1302 via the line D2 and continuously extracted from the line D4. The liquid phase component was recovered from the bottom of the continuous multistage distillation column 1301 via line D3.
The liquid phase component extracted via line D6 is continuously fed to the middle stage of continuous multistage distillation column 1304 having an inner diameter of about 5 cm and a column length of 2 m packed with Dickson packing (6 mmφ), and the liquid phase component is distilled and separated. It was. The amount of heat required for the distillation separation was supplied by circulating the column bottom liquid through line D8 boiler 1306. The liquid temperature at the bottom of the continuous multistage distillation column 1304 was 220 ° C., and the pressure at the top of the column was about 5.2 kPa. The gas distilled from the top of the continuous multistage distillation column 1304 was condensed in the condenser 1305 via the line D7 and continuously extracted from the line D9. From the bottom of the continuous multistage distillation column 1304, the liquid phase component was recovered via line D8 and line D11.
The liquid phase component extracted from the line D8 is continuously fed to the middle stage of a continuous multistage distillation column 1307 having an inner diameter of about 5 cm and a column length of 2 m packed with Dickson packing (6 mmφ), and the liquid phase component is separated by distillation. I did it. The amount of heat required for the distillation separation was supplied by circulating the column bottom liquid through line D14 and reboiler 1309. The liquid temperature at the bottom of continuous multistage distillation column 1307 was 220 ° C., and the pressure at the top of the column was about 0.40 kPa. The gas distilled from the top of the continuous multistage distillation column 1307 was condensed in the condenser 1308 via the line D12 and continuously extracted via the line D13. The extraction amount in a steady state was about 75 g / hr.
The liquid extracted from the line D13 was a solution containing about 99.8% by weight of 4,4′-methylene-bis (cyclohexyl isocyanate). The yield based on 4,4′-methylenebis (cyclohexylamine) was 80.4%. When continuous operation was performed for 10 days, accumulation of deposits was observed inside the continuous multistage distillation column 1301.

[Example 8]
Step (8-1): Production of N, N′-hexanediyl-bis-carbamic acid diphenyl ester 1350 g (6.3 mol) of diphenyl carbonate of Reference Example 1, 4-dodecylphenol (Aldrich, USA) instead of phenol Product) 2204 g (8.4 mol) and 244 g (2.1 mol) of hexamethylenediamine were supplied, and the same method as in step (1-1) of Example 1 was performed.
As a result of analyzing the solution after the reaction by liquid chromatography, N, N′-hexanediyl-bis-carbamic acid diphenyl ester was produced in a yield of 99.0%.
Step (8-2): Production of isocyanate by thermal decomposition of N, N′-hexanediyl-bis-carbamic acid diphenyl ester A reaction was carried out using an apparatus as shown in FIG.
A thin film distillation apparatus 801 having a heat transfer area of 0.1 m ² was heated to 220 ° C., and the internal pressure was set to about 5.2 kPa. The mixture collected in the storage tank 705 in the step (8-1) was heated to 150 ° C. and supplied to the upper portion of the thin film distillation apparatus 801 through the line 81 at about 1200 g / hr. The liquid phase component was extracted from the bottom of the thin film distillation apparatus 801 through the line 83 and circulated to the upper part of the thin film distillation apparatus 801 through the line 84 and the line 81. Gas phase components were extracted from line 82.
The gas phase component extracted from the thin film distillation apparatus 801 via the line 82 is continuously fed to the middle stage of the continuous multistage distillation column 802 having an inner diameter of about 5 cm and a column length of 2 m packed with Dickson packing (6 mmφ). Was separated by distillation. The amount of heat required for the distillation separation was supplied by circulating the column bottom liquid through line 86 and reboiler 804. The liquid temperature at the bottom of the continuous multistage distillation column 802 was 150 ° C., and the pressure at the top of the column was about 4.0 kPa. The gas distilled from the top of the continuous multistage distillation column 802 was condensed in the condenser 803 via the line 85 and continuously extracted from the line 87. A liquid phase component was extracted from a line 89 at a position lower than the line 82 of the continuous multistage distillation column 802.
The liquid phase component extracted from the line 89 is continuously fed to the middle stage of a continuous multistage distillation column 805 having an inner diameter of about 5 cm and a column length of 2 m packed with Dickson packing (6 mmφ), and the liquid phase component is separated by distillation. I did it. The amount of heat required for the distillation separation was supplied by circulating the column bottom liquid through line 91 and reboiler 807. The liquid temperature at the bottom of continuous multistage distillation column 805 was 150 ° C., and the pressure at the top of the column was about 0.8 kPa. The gas distilled from the top of the continuous multistage distillation column 805 was condensed in the condenser 806 via the line 90 and continuously extracted into the storage tank 809 via the line 92. The extraction amount in a steady state was about 104 g / hr.
In the steady state, the liquid phase component was extracted from the line 94 to the storage tank 810 at about 690 g / hr. The liquid phase component contained about 97% by weight of 4-dodecylphenol.
The liquid extracted from the line 92 was a solution containing about 99.8% by weight of hexamethylene diisocyanate. The yield based on hexamethylenediamine was 93.1%. Although continuous operation was carried out for 10 days, no accumulation of deposits was observed on the wall surface of the thin film distillation apparatus 801.

[Example 9]
Step (9-1): Production of 3- (phenoxycarbonylamino-methyl) -3,5,5-trimethylcyclohexylcarbamic acid phenyl ester 1028 g (4.8 mol) of diphenyl carbonate in Reference Example 1, 2 instead of phenol , 4- (α, α-dimethylbenzyl) phenol (manufactured by Tokyo Chemical Industry Co., Ltd., Japan) 2643 g (8.0 mol) and 3-aminomethyl-3,5,5-trimethylcyclohexylamine 273 g (1.6 mol) The same method as in step (2-1) of Example 2 was performed except that was supplied.
As a result of analyzing the solution after the reaction by liquid chromatography, 3- (phenoxycarbonylamino-methyl) -3,5,5-trimethylcyclohexylcarbamic acid phenyl ester was produced in a yield of 99.0%.
Step (9-2): Preparation of isocyanate by thermal decomposition of 3- (phenoxycarbonylamino-methyl) -3,5,5-trimethylcyclohexylcarbamic acid phenyl ester Instead of the mixture obtained in step (8-1) The same method as in step (8-2) of Example 8 was performed except that the mixture obtained in step (9-2) was used and the mixture was heated to 150 ° C. and supplied at about 1310 g / hr. It was.
The gas distilled from the top of the continuous multistage distillation column 805 was condensed in the condenser 806 via the line 90 and continuously extracted into the storage tank 809 via the line 92 at about 112 g / hr.
The liquid extracted from the line 92 was a solution containing about 99.8% by weight of isophorone diisocyanate. The yield based on 3-aminomethyl-3,5,5-trimethylcyclohexylamine was 94.5%. Although continuous operation was carried out for 10 days, no accumulation of deposits was observed on the wall surface of the thin film distillation apparatus 801.

[Example 10]
Step (10-1): Production of N, N ′-(4,4′-methanediyl-diphenyl) -biscarbamic acid diphenyl ester The reaction was carried out using an apparatus as shown in FIG.
With the line 74 closed, a mixed liquid of 1478 g (6.9 mol) of diphenyl carbonate of Reference Example 1 and 50.5 g (0.2 mol) of zinc acetate dihydrate (manufactured by Aldrich, USA) was lined from the storage tank 701. 71 and fed to a SUS reaction vessel 704 with a baffle having an internal volume of 5 L, and phenol 1297 g (13.8 mol) was fed from the storage tank 702 via the line 72 to the SUS reactor. The liquid temperature in the reactor 704 is adjusted to about 50 ° C., and 456 g (2.3 mol) of 4,4′-methylene aniline (manufactured by Aldrich, USA) is transferred from the storage tank 703 to the reactor 704 via the line 73. It was supplied at about 200 g / hr.
As a result of analyzing the solution after the reaction by liquid chromatography, N, N ′-(4,4′-methanediyl-diphenyl) -biscarbamic acid diphenyl ester was produced in a yield of 98.8%.
The line 74 was opened, and the reaction solution was transferred to the storage tank 705 via the line 74.
Step (10-2): Production of isocyanate by thermal decomposition of N, N ′-(4,4′-methanediyl-diphenyl) -biscarbamic acid diphenyl ester The reaction was carried out using an apparatus as shown in FIG. .
The thin film distillation apparatus 1201 having a heat transfer area of 0.1 m ² was heated to 230 ° C., and the internal pressure was set to about 1.3 kPa. The mixture collected in the storage tank 705 in the step (10-1) was heated to 130 ° C. and supplied to the upper part of the thin film distillation apparatus 1201 at about 690 g / hr via the line C1. The liquid phase component was extracted from line C3 from the bottom of thin film distillation apparatus 1201, and circulated through line C4 and line C1 to the upper part of thin film distillation apparatus 1201. The gas phase component was extracted from line C2.
The gas phase component extracted from the thin film distillation apparatus 1201 via the line C2 is continuously fed to the middle stage of the continuous multistage distillation column 1202 having an inner diameter of about 5 cm and a column length of 2 m packed with Dickson packing (6 mmφ). Distillation separation was performed. The amount of heat required for the distillation separation was supplied by circulating the column bottom liquid through line 86 and reboiler 804. The liquid temperature at the bottom of continuous multistage distillation column 1201 was 200 ° C., and the pressure at the top of the column was 60 kPa. The gas distilled from the top of the continuous multistage distillation column 1201 was condensed in the condenser 1203 via the line C5 and continuously extracted from the line C7. The liquid phase component was extracted from line C8.
The liquid phase component extracted from the line C8 is continuously fed to the middle stage of a continuous multistage distillation column 1205 having an inner diameter of about 5 cm and a column length of 2 m packed with Dickson packing (6 mmφ), and the liquid phase component is separated by distillation. I did it. The amount of heat required for the distillation separation was supplied by circulating the column bottom liquid through line C11 and reboiler 1207. The liquid temperature at the bottom of continuous multistage distillation column 1205 was 210 ° C., and the pressure at the top of the column was about 2.5 kPa. A gas distilled from the top of the continuous multistage distillation column 1205 was condensed by a condenser 1206 via a line C10 and continuously extracted via a line C12. The liquid phase component was extracted from line C14.
The liquid phase component extracted from the line C14 is continuously fed to the middle stage of a continuous multistage distillation column 1208 having an inner diameter of about 5 cm and a column length of 2 m packed with Dickson packing (6 mmφ), and the liquid phase component is separated by distillation. I did it. The amount of heat required for distillation separation was supplied by circulating the column bottom liquid through line C16 and reboiler 1210. The liquid temperature at the bottom of continuous multistage distillation column 1208 was 220 ° C., and the pressure at the top of the column was about 0.5 kPa. The gas distilled from the top of the continuous multistage distillation column 1205 was condensed by the condenser 1209 via the line C15, and continuously extracted at about 99.6 g / hr via the line C17. The liquid extracted from C17 contained about 99.9% by weight of 4,4′-diphenylmethane diisocyanate. The yield based on 4,4′-methylenedianiline was 82.3%. Although continuous operation was carried out for 10 days, accumulation of deposits was not observed on the wall surface of the thin-film distillation apparatus 1202.

[Example 11]
Step (11-1): Production of toluene-2,4-dicarbamic acid diphenyl ester A reaction was carried out using an apparatus as shown in FIG.
With the line 74 closed, a mixed liquid of 2125 g (9.9 mol) of diphenyl carbonate and 35.1 g (0.2 mol) of zinc acetate dihydrate of Reference Example 1 was transferred from the storage tank 701 via the line 71 to an internal volume of 5 L. The SUS reaction vessel with baffle 704 was supplied, and 1534 g (16.3 mol) of phenol was supplied from the storage tank 702 via the line 72 to the SUS reactor. The liquid temperature in the reactor 704 is adjusted to about 50 ° C., and 391 g (3.2 mol) of 2,4-toluenediamine (made by Aldrich, USA) is supplied from the storage tank 703 to the reactor 704 via the line 73. / Hr.
As a result of analyzing the solution after the reaction by liquid chromatography, toluene-2,4-dicarbamic acid diphenyl ester was produced in a yield of 98.1%.
The line 74 was opened, and the reaction solution was transferred to the storage tank 705 via the line 74.
Step (11-2): Production of isocyanate by thermal decomposition of toluene-2,4-dicarbamic acid diphenyl ester The reaction was carried out using an apparatus as shown in FIG.
A thin film distillation apparatus 801 having a heat transfer area of 0.1 m ² was heated to 220 ° C., and the internal pressure was set to about 13 kPa. The mixture collected in the storage tank 705 in the step (11-1) was heated to 130 ° C. and supplied to the upper portion of the thin film distillation apparatus 801 through the line 81 at about 820 g / hr. The liquid phase component was extracted from the bottom of the thin film distillation apparatus 801 through the line 83 and circulated to the upper part of the thin film distillation apparatus 801 through the line 84 and the line 81. Gas phase components were extracted from line 82.
The gas phase component extracted from the thin film distillation apparatus 801 via the line 82 is continuously fed to the middle stage of the continuous multistage distillation column 802 having an inner diameter of about 5 cm and a column length of 2 m packed with Dickson packing (6 mmφ). Was separated by distillation. The amount of heat required for the distillation separation was supplied by circulating the column bottom liquid through line 86 and reboiler 804. The liquid temperature at the bottom of continuous multistage distillation column 802 was 150 ° C., and the pressure at the top of the column was about 15 kPa. The gas distilled from the top of the continuous multistage distillation column 802 was condensed in the condenser 803 via the line 85 and continuously extracted from the line 87. A liquid phase component was extracted from a line 89 at a position lower than the line 82 of the continuous multistage distillation column 802.
The liquid phase component extracted from the line 89 is continuously fed to the middle stage of a continuous multistage distillation column 805 having an inner diameter of about 5 cm and a column length of 2 m packed with Dickson packing (6 mmφ), and the liquid phase component is separated by distillation. I did it. The amount of heat required for the distillation separation was supplied by circulating the column bottom liquid through line 91 and reboiler 807. The liquid temperature at the bottom of continuous multistage distillation column 805 was 150 ° C., and the pressure at the top of the column was about 1.3 kPa. The gas distilled from the top of the continuous multistage distillation column 805 was condensed in the condenser 806 via the line 90 and continuously extracted at about 93 g / hr in the storage tank 809 via the line 92.
The liquid extracted from the line 92 was a solution containing about 99.7% by weight of 2,4-tolylene diisocyanate. The yield based on 2,4-toluenediamine was 83.4%. Although continuous operation was carried out for 10 days, no accumulation of deposits was observed on the wall surface of the thin film distillation apparatus 801.

[Example 12]
Step (12-1): Production of N, N ′-(4,4′-methanediyl-diphenyl) -biscarbamic acid diphenyl ester 2055 g (9.5 mol) of diphenyl carbonate of Reference Example 1 and zinc acetate dihydrate Step (10-1) of Example 10 except that 54.9 g (0.3 mol) of the mixed solution, phenol 1293 g (13.8 mol) and 4,4′-methylenedianiline 496 g (2.5 mol) were used. The same method was performed.
As a result of analyzing the solution after the reaction by liquid chromatography, N, N ′-(4,4′-methanediyl-diphenyl) -biscarbamic acid diphenyl ester was produced in a yield of 98.6%.
Step (12-2): Production of isocyanate by thermal decomposition of N, N ′-(4,4′-methanediyl-diphenyl) -biscarbamic acid diphenyl ester Instead of the mixture obtained in step (7-1), The mixture obtained in the step (12-1) was used, the mixture was heated to 130 ° C., and fed through the line D1 at about 700 g / hr to conduct a thermal decomposition reaction. The amount of heat required for the pyrolysis reaction was supplied by circulating the column bottom liquid through line D3 and reboiler 1303. The liquid temperature at the bottom of the continuous multistage distillation column 1301 was 220 ° C., and the pressure at the top of the column was about 15 kPa. The gas distilled from the top of the continuous multistage distillation column 1301 was condensed in the condenser 1302 via the line D2 and continuously extracted from the line D4. The liquid phase component was recovered from the bottom of the continuous multistage distillation column 1301 via line D3.
The liquid phase component extracted via line D6 is continuously fed to the middle stage of continuous multistage distillation column 1304 having an inner diameter of about 5 cm and a column length of 2 m packed with Dickson packing (6 mmφ), and the liquid phase component is distilled and separated. It was. The amount of heat required for the distillation separation was supplied by circulating the column bottom liquid through line D8 boiler 1306. The liquid temperature at the bottom of the continuous multistage distillation column 1304 was 220 ° C., and the pressure at the top of the column was about 5.2 kPa. The gas distilled from the top of the continuous multistage distillation column 1304 was condensed in the condenser 1305 via the line D7 and continuously extracted from the line D9. From the bottom of the continuous multistage distillation column 1304, the liquid phase component was recovered via line D8 and line D11.
The liquid phase component extracted from the line D8 is continuously fed to the middle stage of a continuous multistage distillation column 1307 having an inner diameter of about 5 cm and a column length of 2 m packed with Dickson packing (6 mmφ), and the liquid phase component is separated by distillation. I did it. The amount of heat required for the distillation separation was supplied by circulating the column bottom liquid through line D14 and reboiler 1309. The liquid temperature at the bottom of continuous multistage distillation column 1307 was 220 ° C., and the pressure at the top of the column was about 0.40 kPa. The gas distilled from the top of the continuous multistage distillation column 1307 was condensed in the condenser 1308 via the line D12 and continuously extracted via the line D13. The extraction amount in a steady state was about 92 g / hr.
The liquid extracted from the line D13 was a solution containing about 99.8% by weight of 4,4′-diphenylmethane diisocyanate. The yield based on 4,4′-methylenedianiline was 76.9%. When continuous operation was performed for 10 days, accumulation of deposits was observed inside the continuous multistage distillation column 1301.

[Example 13]
Step (13-1): Production of N, N′-hexanediyl-bis-carbamic acid diphenyl ester The diphenyl carbonate of Reference Example 1 was placed in an eggplant-shaped flask having an internal volume of 10 L. Cock, helipak no. A distillation column packed with 3 and a fractionation tower with a reflux condenser connected to a distillate receiver and a thermometer were attached, the inside of the system was replaced with vacuum-nitrogen, and diphenyl carbonate was purified by distillation. When ¹ H-NMR measurement was performed on the distilled purified product, it contained about 99.9% by weight of diphenyl carbonate. Moreover, 0.002 ppm of iron was contained as a metal atom.
The same method as in step (1-1) of Example 1 was carried out except that 1414 g (6.6 mol) of diphenyl carbonate, 1034 g (11.0 mol) of phenol and 256 g (2.2 mol) of hexamethylenediamine were supplied. .
As a result of analyzing the solution after the reaction by liquid chromatography, N, N′-hexanediyl-bis-carbamic acid diphenyl ester was produced in a yield of 99.0%.
Step (13-2): Production of isocyanate by thermal decomposition of N, N′-hexanediyl-bis-carbamic acid diphenyl ester In place of the mixture obtained in Step (1-1), Step (13-1) The same method as in step (1-2) of Example 1 was performed except that the mixture obtained in (1) was used. The liquid was continuously extracted from the line 92 to the storage tank 809 at about 104 g / hr. The liquid extracted from the line 92 was a solution containing about 99.8% by weight of hexamethylene diisocyanate. The yield based on hexamethylenediamine was 95.0%. Although continuous operation was carried out for 10 days, no accumulation of deposits was observed on the wall surface of the thin film distillation apparatus 801.

[Example 14]
Step (14-1): Production of N, N′-hexanediyl-bis-carbamic acid diphenyl ester To diphenyl carbonate in Reference Example 1, acetylacetonatoiron (II) is added, and 8% of iron is used as a metal atom. Containing diphenyl carbonate was prepared. Except that 1371 g (6.4 mol) of the diphenyl carbonate, 940 g (10.0 mol) of phenol and 232 g (2.0 mol) of hexamethylenediamine were supplied, the same method as in step (1-1) of Example 1 was performed. I did it.
As a result of analyzing the solution after the reaction by liquid chromatography, N, N′-hexanediyl-bis-carbamic acid diphenyl ester was produced in a yield of 98.9%.
Step (14-2): Production of isocyanate by thermal decomposition of N, N′-hexanediyl-bis-carbamic acid diphenyl ester Instead of the mixture obtained in Step (1-1), Step (14-1) The same method as in step (1-2) of Example 1 was performed except that the mixture obtained in (1) was used. The liquid was continuously extracted from the line 92 to the storage tank 809 at about 101 g / hr. The liquid extracted from the line 92 was a solution containing about 99.8% by weight of hexamethylene diisocyanate. The yield based on hexamethylenediamine was 95.2%. Although continuous operation was carried out for 10 days, no accumulation of deposits was observed on the wall surface of the thin film distillation apparatus 801.

[Example 15]
Step (15-1): Production of N, N′-hexanediyl-bis-carbamic acid diphenyl ester The diphenyl carbonate of Reference Example 1 was placed in an eggplant-shaped flask having an internal volume of 10 L. Cock, helipak no. A distillation column packed with 3 and a fractionation tower with a reflux condenser connected to a distillate receiver and a thermometer were attached, the inside of the system was replaced with vacuum-nitrogen, and diphenyl carbonate was purified by distillation. When a distillate of about one-fourth of the charged amount was obtained, the flask was cooled and distillation purification was completed. When ¹ H-NMR measurement was performed on the distillate, the distillate contained about 99.9% by weight of diphenyl carbonate. Moreover, the metal atom contained in this distillate was below the detection limit (0.001 ppm) about iron, cobalt, nickel, zinc, tin, copper, and titanium.
The same method as in step (1-1) of Example 1 was carried out except that 1553 g (7.3 mol) of diphenyl carbonate, 1175 g (12.5 mol) of phenol and 291 g (2.5 mol) of hexamethylenediamine were supplied. .
As a result of analyzing the solution after the reaction by liquid chromatography, N, N′-hexanediyl-bis-carbamic acid diphenyl ester was produced in a yield of 95.6%.
-Step (15-2): Production of isocyanate by thermal decomposition of N, N'-hexanediyl-bis-carbamic acid diphenyl ester Instead of the mixture obtained in step (1-1), step (15-1) The same method as in step (1-2) of Example 1 was performed except that the mixture obtained in (1) was used. The liquid was continuously extracted from the line 92 to the storage tank 809 at about 99.1 g / hr. The liquid extracted from the line 92 was a solution containing about 99.8% by weight of hexamethylene diisocyanate. The yield based on hexamethylenediamine was 88.9%. Although continuous operation was carried out for 10 days, no accumulation of deposits was observed on the wall surface of the thin film distillation apparatus 801.

[Example 16]
Step (16-1): Production of N, N′-hexanediyl-bis-carbamic acid diphenyl ester To diphenyl carbonate in Reference Example 1, acetylacetonatoiron (II) is added, and 13% of iron is used as a metal atom. Containing diphenyl carbonate was prepared. The same method as in step (1-1) of Example 1 except that 1527 g (7.1 mol) of the diphenyl carbonate, 1081 g (11.5 mol) of phenol, and 267 g of hexamethylenediamine (2.3 mol) were supplied. I did it.
As a result of analyzing the solution after the reaction by liquid chromatography, N, N′-hexanediyl-bis-carbamic acid diphenyl ester was produced in a yield of 94.5%.
Step (16-2): Production of isocyanate by thermal decomposition of N, N′-hexanediyl-bis-carbamic acid diphenyl ester Instead of the mixture obtained in Step (1-1), Step (16-1) The same method as in step (1-2) of Example 1 was performed except that the mixture obtained in (1) was used. The liquid was continuously extracted from the line 92 to the storage tank 809 at about 95.1 g / hr. The liquid extracted from the line 92 was a solution containing about 99.8% by weight of hexamethylene diisocyanate. The yield based on hexamethylenediamine was 88.0%. When continuous operation was performed for 10 days, accumulation of deposits was observed on the wall surface of the thin-film distillation apparatus 801.

[Example 17]
Step (17-1): Production of N, N′-hexanediyl-bis-carbamic acid diphenyl ester 1350 g (6.3 mol) of diphenyl carbonate and 790 g (8.4 mol) of phenol were fed, instead of hexamethylenediamine. The same method as in step (1-1) of Example 1 was performed except that a mixed solution of 244 g (2.1 mol) of hexamethylenediamine and 197 g (2.1 mol) of phenol was supplied.
As a result of analyzing the solution after the reaction by liquid chromatography, N, N′-hexanediyl-bis-carbamic acid diphenyl ester was produced in a yield of 99.0%.
Step (17-2): Production of isocyanate by thermal decomposition of N, N′-hexanediyl-bis-carbamic acid diphenyl ester Instead of the mixture obtained in Step (1-1), Step (17-1) The same method as in step (1-2) of Example 1 was performed except that the mixture obtained in (1) was used. The liquid was continuously extracted from the line 92 to the storage tank 809 at about 106 g / hr. The liquid extracted from the line 92 was a solution containing about 99.8% by weight of hexamethylene diisocyanate. The yield based on hexamethylenediamine was 97.0%. Although continuous operation was carried out for 10 days, no accumulation of deposits was observed on the wall surface of the thin film distillation apparatus 801.

[Example 18]
Step (18-1): Production of N, N′-hexanediyl-bis-carbamic acid bis (3-methylbutyl) ester An apparatus as shown in FIG. 16 was used.
With the line G4 closed, 1660 g (7.8 mol) of diphenyl carbonate is supplied from the storage tank 1601 to the SUS reaction vessel 1604 with a baffle having an internal volume of 5 L via the line G1, and 1175 g (12.5 mol) of phenol is supplied from the storage tank 1602. It supplied to this SUS reactor via the line G2. The liquid temperature in the reactor 1604 was adjusted to about 50 ° C., and a mixed solution of 291 g (2.5 mol) of hexamethylenediamine and water was supplied from the storage tank 1603 to the reactor 1604 at about 200 g / hr via line G3. .
After completion of the reaction, the pressure inside the reactor 1604 was reduced to 10 kPa, and water was distilled off. The water was condensed by the condenser 1607 and extracted through the line G6.
As a result of analyzing the solution after the reaction by liquid chromatography, N, N′-hexanediyl-bis-carbamic acid diphenyl ester was produced in a yield of 99.0%.
The line G4 was opened, and the reaction solution was transferred to the storage tank 1605 via the line G4.
Step (18-2): Production of isocyanate by thermal decomposition of N, N′-hexanediyl-bis-carbamic acid diphenyl ester Instead of the mixture obtained in Step (1-1), Step (18-1) The same method as in step (1-2) of Example 1 was performed except that the mixture obtained in (1) was used. The heating area of the thin film distillation apparatus 801 with respect to the reactor capacity is larger than that of the reactor 1604 in FIG. The liquid was continuously extracted from the line 92 to the storage tank 809 at about 104 g / hr. The liquid extracted from the line 92 was a solution containing about 99.8% by weight of hexamethylene diisocyanate. The yield based on hexamethylenediamine was 96.5%. Although continuous operation was carried out for 10 days, no accumulation of deposits was observed on the wall surface of the thin film distillation apparatus 801.

[Example 19] Cleaning of reactor The cleaning operation of the thin-film distillation apparatus 801 in which the accumulation of deposits was observed in Example 6 was performed. The thin film distillation apparatus 801 was heated to 180 ° C., and the inside of the thin film distillation apparatus 801 was set to an atmospheric pressure nitrogen atmosphere. Phenol was supplied at about 1200 g / hr from the line 81, extracted from the line 83, and the liquid phase component was recovered in the storage tank 810 via the line 94. When this operation was performed for 1 hour, no deposit was observed inside the thin film distillation apparatus 801.

[Example 20] to [Example 27]
Table 1 shows the results of performing the operation of Example 6 continuously and performing the cleaning operation in the same manner as in Example 19 using various cleaning solvents every 10 days.

[Comparative Example 1]
Step (A-1): Production of N, N′-hexanediyl-bis-carbamic acid diphenyl ester The reaction was carried out using an apparatus as shown in FIG.
With the line E4 closed, 1979 g (9.2 mol) of diphenyl carbonate is supplied from the storage tank 1401 to the SUS reaction vessel 1404 with a baffle having an internal volume of 5 L via the line E1, and 1316 g (14.0 mol) of phenol is supplied from the storage tank 1402. The SUS reactor was supplied via line E2. The liquid temperature in the reactor 1404 was adjusted to about 50 ° C., and 325 g (2.8 mol) of hexamethylenediamine was supplied from the storage tank 1403 through the line E3 to the reactor 1404 at about 190 g / hr.
As a result of analyzing the solution after the reaction by liquid chromatography, N, N′-hexanediyl-bis-carbamic acid diphenyl ester was produced in a yield of 99.3%.
Step (A-2): Production of isocyanate by thermal decomposition of N, N′-hexanediyl-bis-carbamic acid diphenyl ester Subsequently, a reaction was carried out using an apparatus as shown in FIG.
A SUS reactor 1404 was heated to 220 ° C., and the pressure in the reactor was reduced to 1.3 kPa. The gas phase component was extracted from the line E4 and continuously fed to the middle stage of a continuous multistage distillation column 1405 having an inner diameter of about 5 cm and a column length of 2 m packed with Dickson packing (6 mmφ). Distillation separation was performed. The amount of heat required for the distillation separation was supplied by circulating the column bottom liquid through line E6 and reboiler 1408. The liquid temperature at the bottom of continuous multistage distillation column 1405 was 150 ° C., and the pressure at the top of the column was about 15 kPa. The gas distilled from the top of the continuous multistage distillation column 802 was condensed in the condenser 1407 via the line E5 and continuously extracted from the line E7. A liquid phase component was extracted from a line E9 at a position lower than the line E4 in the continuous multistage distillation column 1405.
The liquid phase component extracted from the line E9 is continuously fed to the middle stage of a continuous multistage distillation column 1406 having an inner diameter of about 5 cm and a column length of 2 m packed with Dickson packing (6 mmφ), and the liquid phase component is separated by distillation. I did it. The amount of heat required for the distillation separation was supplied by circulating the column bottom liquid through line E11 and reboiler 1412. The liquid temperature at the bottom of continuous multistage distillation column 1406 was 150 ° C., and the pressure at the top of the column was about 1.5 kPa. The gas distilled from the top of the continuous multistage distillation column 1406 was condensed in the condenser 1410 via the line E10 and continuously extracted into the storage tank 1411 via the line E12. The liquid recovered in the storage tank 1411 was about 304 g. The solution was a solution containing about 99.8% by weight of hexamethylene diisocyanate. The yield based on hexamethylenediamine was 64.5%.

[Comparative Example 2]
Step (B-1): Production of N, N ′-(4,4′-methanediyl-diphenyl) -biscarbamic acid diphenyl ester The reaction was carried out using an apparatus as shown in FIG.
With the line F4 closed, a mixture of 1527 g (7.1 mol) of diphenyl carbonate and 50.5 g (0.2 mol) of zinc acetate dihydrate is passed through the line F1 from the storage tank 1501, and the reaction is made of SUS with a baffle with an internal volume of 5L. It supplied to the container 1504 and 1146 g (1.2 mol) of phenol was supplied from the storage tank 1502 to the SUS reactor via the line F2. The liquid temperature in the reactor 1504 was adjusted to about 50 ° C., and 456 g (2.3 mol) of 4,4′-methylenedianiline was supplied from the storage tank 1503 to the reactor 1504 through the line F3 at about 200 g / hr. .
As a result of analyzing the solution after the reaction by liquid chromatography, N, N ′-(4,4′-methanediyl-diphenyl) -biscarbamic acid diphenyl ester was produced in a yield of 98.3%.
Step (B-2): Production of isocyanate by thermal decomposition of N, N ′-(4,4′-methanediyl-diphenyl) -biscarbamic acid diphenyl ester Subsequently, the reaction was carried out using an apparatus as shown in FIG. I did it.
A SUS reactor 1504 was heated to 220 ° C., and the pressure in the reactor was reduced to 1.3 kPa. The gas phase component was extracted from the line F4, and the gas phase component was continuously fed to the middle stage of a continuous multistage distillation column 1506 having an inner diameter of about 5 cm and a column length of 2 m packed with Dickson packing (6 mmφ). Distillation separation was performed. The amount of heat required for the distillation separation was supplied by circulating the column bottom liquid through line F6 and reboiler 1507. The liquid temperature at the bottom of continuous multistage distillation column 1506 was 200 ° C., and the pressure at the top of the column was 60 kPa. The gas distilled from the top of continuous multistage distillation column 1506 was condensed in condenser 1505 via line F5 and continuously extracted from line F7. The liquid phase component was extracted from the line F6.
The liquid phase component extracted from the line F6 is continuously fed to the middle stage of a continuous multistage distillation column 1509 having an inner diameter of about 5 cm and a column length of 2 m packed with Dickson packing (6 mmφ), and the liquid phase component is separated by distillation. I did it. The amount of heat required for the distillation separation was supplied by circulating the column bottom liquid through line F11 and reboiler 1510. The liquid temperature at the bottom of continuous multistage distillation column 1509 was 210 ° C., and the pressure at the top of the column was about 2.5 kPa. A gas distilled from the top of the continuous multistage distillation column 1509 was condensed by a condenser 1508 via a line F10 and continuously extracted via a line F12. The liquid phase component was extracted from the line F11.
The liquid phase component extracted from the line F14 is continuously fed into the middle stage of a continuous multistage distillation column 1512 having an inner diameter of about 5 cm and a column length of 2 m packed with Dickson packing (6 mmφ), and the liquid phase component is separated by distillation. I did it. The amount of heat necessary for distillation separation was supplied by circulating the column bottom liquid through line F16 and reboiler 1513. The liquid temperature at the bottom of continuous multistage distillation column 1512 was 220 ° C., and the column top pressure was about 0.5 kPa. The gas distilled from the top of the continuous multistage distillation column 1512 was condensed in the condenser 1511 via the line F15 and extracted via the line F17. The liquid extracted from F17 was about 70 g, and contained about 99.9% by weight of 4,4′-diphenylmethane diisocyanate. The yield based on 4,4′-methylenedianiline was 56.0%.

[Comparative Example 3]
Step (C-1): Production of N, N′-hexanediyl-bis-carbamic acid diphenyl ester The reaction was carried out using an apparatus as shown in FIG.
With the line 74 closed, 2454 g (11.5 mol) of diphenyl carbonate was supplied from the storage tank 701 to the reaction vessel 704 made of SUS with a baffle having an internal volume of 5 L via the line 71. The liquid temperature in the reactor 704 is adjusted to about 80 ° C. to melt diphenyl carbonate, and 372 g (3.2 mol) of hexamethylenediamine is supplied from the storage tank 703 via the line 73 to the reactor 704 at about 100 g / hr. did.
As a result of analyzing the solution after the reaction by liquid chromatography, N, N′-hexanediyl-bis-carbamic acid diphenyl ester was produced in a yield of 77.5%.
The line 74 was opened, and the reaction solution was transferred to the storage tank 705 via the line 74.
Step (C-2): Production of isocyanate by thermal decomposition of N, N′-hexanediyl-bis-carbamic acid diphenyl ester The reaction was carried out using an apparatus as shown in FIG.
The same method as in step (1-2) of Example 1 was performed except that the mixture obtained in step (C-1) was used instead of the mixture obtained in step (1-1).
About 113 g / hr of liquid was continuously extracted to the storage tank 809 via the line 92.
The liquid extracted from the line 92 was a solution containing about 99.8% by weight of hexamethylene diisocyanate. The yield based on hexamethylenediamine was 74.4%.

[Comparative Example 4] to [Comparative Example 6]
Table 1 shows the results of performing the operation of Example 6 continuously and performing the cleaning operation in the same manner as in Example 13 using various cleaning solvents every 10 days.

  Since the isocyanate production method of the present invention can efficiently produce isocyanate without using highly toxic phosgene, the production method of the present invention is very useful in industry and has high commercial value.

Claims (33)

In a reactor in which a reaction between a diaryl carbonate and an amine compound is performed, an aryl carbamate having an aryl group derived from diaryl carbonate and an aromatic hydroxy compound derived from diaryl carbonate are reacted with the diaryl carbonate and the amine compound. Obtaining a reaction mixture containing, diaryl carbonate, and
Transferring the reaction mixture to a pyrolysis reactor connected by piping to the reactor in which the reaction between the diaryl carbonate and the amine compound takes place;
Obtaining an isocyanate by subjecting the aryl carbamate to a thermal decomposition reaction;
Including
A process for producing an isocyanate, wherein the amine compound is a polyamine compound.   The manufacturing method of Claim 1 which further includes the process of wash | cleaning the high boiling point byproduct adhering to this thermal decomposition reactor with an acid.   The process according to claim 1, wherein the reaction between the diaryl carbonate and the amine compound is carried out at a stoichiometric ratio of the diaryl carbonate to the amino group constituting the amine compound of 1 or more.   The production method according to claim 1, wherein the diaryl carbonate and the amine compound are reacted in the presence of an aromatic hydroxy compound as a reaction solvent.   The aromatic hydroxy compound as a reaction solvent is the same kind as the compound ArOH having a structure in which a hydrogen atom is added to a group ArO constituting the diaryl carbonate ArOCOOAr (Ar represents an aromatic group and O represents an oxygen atom). The production method according to claim 4, which is an aromatic hydroxy compound.   The production method according to claim 1, wherein the reaction mixture is supplied as a liquid to a pyrolysis reactor.   The production method according to claim 6, wherein the reaction mixture is maintained in a temperature range of 10 ° C. to 180 ° C. and supplied to the pyrolysis reactor.   The process according to claim 1, wherein the reaction mixture is continuously fed to the pyrolysis reactor.   The production method according to claim 1, wherein the low-boiling component produced in the pyrolysis reaction is recovered from the pyrolysis reactor as a gas phase component, and the liquid phase component is recovered from the bottom of the reactor.   The production method according to claim 9, wherein the recovery of the gas phase component and the recovery of the liquid phase component are continuously performed.   The production method according to claim 9, wherein the isocyanate obtained by the thermal decomposition reaction of the aryl carbamate is recovered from the thermal decomposition reactor as a gas phase component, and the liquid phase component containing diaryl carbonate is recovered from the bottom of the reactor.   The method further comprises the step of distilling and separating the isocyanate-containing gas phase component recovered from the pyrolysis reactor by a distillation tower, and collecting the isocyanate-containing gas phase component recovered from the pyrolysis reactor. The production method according to claim 11, wherein the phase is supplied to the distillation column in a phase.   The production method according to claim 11, wherein the liquid phase component containing the diaryl carbonate is a mixture containing an aryl carbamate, and a part or all of the mixture is supplied to the upper part of the reactor.   The production method according to claim 9, wherein the isocyanate obtained by the thermal decomposition reaction of the aryl carbamate is recovered as a liquid phase component from the bottom of the reactor in which the thermal decomposition reaction is performed.   The liquid phase component recovered from the bottom of the reactor contains isocyanate and aryl carbamate, and part or all of the isocyanate is separated from the liquid phase component, and the remaining part or all is fed to the top of the reactor. The manufacturing method according to claim 14.   The production method according to claim 14, wherein the isocyanate is recovered by distilling and separating the mixture containing the isocyanate recovered from the thermal decomposition reactor.   The type of the reactor in which the reaction between the diaryl carbonate and the amine compound is performed and the type of the thermal decomposition reactor may be the same or different, and the reactor in which the reaction between the diaryl carbonate and the amine compound is performed And the pyrolysis reactor is at least one reactor selected from the group consisting of a column reactor and a tank reactor.   The production method according to claim 17, wherein the pyrolysis reactor comprises at least one reactor selected from the group consisting of an evaporator, a continuous multistage distillation column, a packed column, a thin film evaporator, and a falling film evaporator.   The process according to claim 1, wherein the reaction between the diaryl carbonate and the amine compound is carried out in the presence of a catalyst.   The production method according to claim 1, wherein the thermal decomposition reaction is performed in a liquid phase. The diaryl carbonate is a compound represented by the following formula (1).

(Where:
R ¹ represents an aromatic group having 6 to 12 carbon atoms. )
The manufacturing method according to claim 1.   The production method according to claim 21, wherein the diaryl carbonate contains 0.001 ppm to 10% of a metal atom.   The method according to claim 22, wherein the metal atom is one or more metals selected from the group consisting of iron, nickel, cobalt, zinc, tin, copper, and titanium. The diaryl carbonate is a diaryl carbonate produced by a process including the following steps (1) to (3).
Step (1): A step of reacting an organotin compound having a tin-oxygen-carbon bond with carbon dioxide to obtain a reaction mixture containing dialkyl carbonate;
Step (2): separating the reaction mixture to obtain a dialkyl carbonate and a residual liquid;
Step (3): a step of reacting the dialkyl carbonate separated in the step (2) with the aromatic hydroxy compound A to obtain a diaryl carbonate and recovering by-produced alcohol;
The manufacturing method according to claim 1.   The production method according to claim 24, wherein the aromatic hydroxy compound A is an aromatic hydroxy compound having 6 to 12 carbon atoms. The diaryl carbonate is a diaryl carbonate produced by a process further comprising the following steps (4) and (5):
Step (4): a step of reacting the residual liquid obtained in Step (2) with an alcohol to form an organic tin compound having a tin-oxygen-carbon bond and water, and removing the water from the reaction system;
Step (5): A step of reusing the organic tin compound having a tin-oxygen-carbon bond obtained in step (4) as the organic tin compound having a tin-oxygen-carbon bond in step (1);
The manufacturing method according to claim 24.   The production method according to claim 24, wherein the alcohol recovered in the step (3) is used as a part or all of the alcohol in the step (4).   10. The production method according to claim 9, wherein diaryl carbonate is separated and recovered from the liquid phase component or gas phase component recovered from the pyrolysis reactor, and the diaryl carbonate is reused as diaryl carbonate as a starting material.   The aromatic hydroxy compound is separated and recovered from the liquid phase component or the gas phase component recovered from the thermal decomposition reactor, and the aromatic hydroxy compound is used as the aromatic hydroxy compound A in step (3) or as the reaction solvent. The production method according to claim 1 or 24, wherein the aromatic hydroxy compound is recycled. The amine compound is a compound represented by the following formula (2):

(Where:
R ² is one group selected from the group consisting of an aliphatic group having 1 to 20 carbon atoms and an aromatic group having 6 to 20 carbon atoms containing an atom selected from carbon and oxygen, and has a valence equal to n Represents a group having
n is an integer of 2 to 10. )
The manufacturing method according to claim 1.   The production method according to claim 30, wherein the amine compound is a diamine compound in which n is 2 in formula (2).   The production method according to claim 1, wherein the supply of the amine compound to the reactor for reacting the carbonate ester and the amine compound is performed in a liquid state.   The production method according to claim 1, wherein the supply of the amine compound to the reactor for reacting the carbonate ester with the amine compound is performed as a mixture of alcohol, water, or carbonate ester.

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