WO2001010812A1 - PREPARATION OU PURIFICATION DE BIS-β-HYDROXYETHYL TEREPHTALATE - Google Patents
PREPARATION OU PURIFICATION DE BIS-β-HYDROXYETHYL TEREPHTALATE Download PDFInfo
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- WO2001010812A1 WO2001010812A1 PCT/JP1999/007284 JP9907284W WO0110812A1 WO 2001010812 A1 WO2001010812 A1 WO 2001010812A1 JP 9907284 W JP9907284 W JP 9907284W WO 0110812 A1 WO0110812 A1 WO 0110812A1
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- bis
- hydroxyethyl terephthalate
- terephthalate
- hydroxyethyl
- anion
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C69/00—Esters of carboxylic acids; Esters of carbonic or haloformic acids
- C07C69/76—Esters of carboxylic acids having a carboxyl group bound to a carbon atom of a six-membered aromatic ring
- C07C69/80—Phthalic acid esters
- C07C69/82—Terephthalic acid esters
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/48—Separation; Purification; Stabilisation; Use of additives
- C07C67/52—Separation; Purification; Stabilisation; Use of additives by change in the physical state, e.g. crystallisation
- C07C67/54—Separation; Purification; Stabilisation; Use of additives by change in the physical state, e.g. crystallisation by distillation
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/48—Separation; Purification; Stabilisation; Use of additives
- C07C67/56—Separation; Purification; Stabilisation; Use of additives by solid-liquid treatment; by chemisorption
Definitions
- the present invention relates to a method for producing bis- (3-hydroxyethyl terephthalate) or a low condensate thereof from an aromatic polyester, and a method for purifying bis (1-hydroxyethyl terephthalate) or a low condensate thereof. . More specifically, a method by which bis_ / 3-hydroxyethyl terephthalate and Z or a low condensate thereof can be efficiently produced even from a recovered aromatic polyester, and a bis-method thus obtained. — / 3-Hydroxyethyl terephthalate and a method for purifying Z or its low condensate with high purity. Background art
- aromatic polyesters have excellent performance suitable for a wide variety of molded article fields such as fibers, films, and resins.
- Another feature of the polyester is that it is relatively easy to return to the raw material stage by depolymerization.
- aromatic polyesters particularly terephthalate-based polyesters, mainly polyethylene terephthalate
- the production method includes the direct esterification reaction of terephthalic acid and ethylene glycol or the lower alkyl ester of terephthalic acid and the transesterification reaction of dimethyl terephthalate with ethylene dalicol to obtain bis-
- the aromatic polyester can be returned to its raw material stage by depolymerization and then condensed and polymerized again to obtain a polyester, so that it can be recovered and reused, and is a material excellent in terms of resource saving.
- a depolymerization reaction is usually performed in a reaction system containing the polyester and an excess amount of ethylene glycol as main components.
- ethylene glycol as main components.
- Such a depolymerization reaction is relatively easy to proceed when an amorphous polyester is used as a raw material, for example. Often relatively difficult to progress.
- the polyester takes the form of a pottle, which is a type of resin molded product, the depolymerization tends to be difficult to proceed at the neck portion where crystallization is progressing.
- the purification of the crude bis-1-hydroxyethyl terephthalate obtained by the depolymerization to a high purity requires the use of this as a raw material for the production of aromatic polyesters again to produce high-quality aromatic polyesters. It is very important if you want to manufacture.
- a typical example of such a purification method is a method of recrystallizing bis-1-hydroxyethyl terephthalate.
- impurities still remain, which are obstacles to obtaining a high-quality polyester. In many cases. In the case where the polyester is recovered and depolymerized to bis (1 / 3-hydroxyethyl terephthalate) to obtain the polyester again, the adverse effects are easily noticeable.
- JP-A-48-86841 discloses that bis-1-hydroxyethyl terephthalate or a mixture of bis-1-hydroxyethyl terephthalate and terephthalic acid is mixed with water.
- a method for purifying a mixture of (bis-) 3-hydroxysethyl terephthalate and terephthalic acid is disclosed.
- the above purification method is a method of treating bis-hydroxyethyl terephthalate by treating it with water, and purifying the bis-) 3-hydroxyethyl terephthalate directly with an ion exchange resin or an adsorbent. Not a way to use. Disclosure of the invention
- An object of the present invention is to provide a method for producing bis-3-hydroxyethyl terephthalate and Z or a low condensate thereof from an aromatic polyester. Another object of the present invention is to improve the efficiency of recovered polyesters, such as aromatic polyesters in a highly crystallized state, such as aromatic polyesters, fiber layers, films, or even recovered pottles having a high crystallinity network portion. An object of the present invention is to provide a method for producing bis-1,3-hydroxyethyl terephthalate and Z or a low condensate thereof which can be chemically decomposed.
- Still another object of the present invention is to provide a high purity bis-] 3-hydroxyethyl terephthalate.
- Still another object of the present invention is to provide a process for producing bis-3-hydroxyethyl terephthalate, in which ions as impurities unavoidably present therein, for example, ions derived from an esterification or transesterification catalyst.
- An object of the present invention is to provide a method for producing highly pure bis-i3-hydroxyethyl terephthalate by removing as much as possible.
- Still another object of the present invention is to provide high purity bis-i3-hydroxyethyl terephthalate from bis_] 3-hydroxyethyl terephthalate obtained by glycol decomposition from recovered polyethylene terephthalate. It is to provide a method for producing the.
- Yet another object of the present invention is to provide highly purified bis-3-hydroxyethyl terephthalate having a very low content of cation and Z or anion.
- an aromatic polyester containing terephthalic acid as a main dicarboxylic acid component and ethylene glycol as a main glycol component is used as bis-1-hydroxyethyl terephate.
- the aromatic polyester was pre-decomposed by heating with sauce and Z or its low condensate,
- Aroma characterized by reacting a pre-decomposed product with ethylene glycol to convert a terephthalic acid component of the pre-decomposed product to bis_i3-hydroxyethyl terephthalate and Z or a low condensate thereof. This is achieved by a process for producing bis / 1 / 3-hydroxyethyl terephthalate and Z or a low condensate thereof from an aromatic polyester (hereinafter sometimes referred to as the first method of the present invention).
- the above objects and advantages of the present invention are as follows: secondly, bis- ⁇ -hydroxyethyl terephthalate and bis- ⁇ -hydroxyethyl terephthalate as an impurity;
- the solution composition of 3-hydroxyethyl terephthalate is brought into contact with a cation exchanger and a ⁇ or anion exchanger to remove cations and anions as impurities.
- the above objects and advantages of the present invention are: Third, the total content of cations and anions is 50 ppm or less, the content of ethylene glycol exceeds 10% by weight and bis Bis- containing a compound having a boiling point lower than that of 3-hydroxyethyl terephthalate is used. (1) The mixture containing bis-hexyl terephthalate is subjected to initial evaporation or distillation to obtain bis-3-hydroxyethyl terephthalate.
- a method for purifying bis-1-hydroxyethyl terephthalate which comprises separating purified bis- ⁇ -hydroxyethyl terephthalate by subjecting to (Hereinafter, sometimes referred to as a third method of the present invention).
- the above-mentioned object and advantages of the present invention are: fourthly, crude bis-hydroxyethyl terephthalate having a total content of cation and anion of 50 ppm or less is evaporated or distilled under reduced pressure.
- a method for purifying bis-3-hydroxyethyl terephthalate (hereinafter referred to as a fourth method of the present invention) May be achieved by
- the polyester in the depolymerization of terephthalate-based polyester, the polyester is supplied into the system in one or more of various forms such as a pellet, a film, a flake, a thread, and a lump.
- the polyesters in these forms gradually become finer and eventually lose their shape. The time required to reach this varies depending on the type and form of the supplied polyester, the degree of crystallinity, the degree of orientation, and the reaction conditions, such as the temperature, the quality of stirring, the form of the reaction tank, and the like.
- the first method of the present invention is a method for allowing a depolymerization reaction to proceed smoothly.
- the first method of the present invention will be described first.
- the aromatic polyester includes terephthalic acid as a main acid component and ethylene glycol as a main glycol component, and also includes those obtained by copolymerizing one or more other components in a small proportion. It is.
- the range of the copolymer component is, for example, usually 40 mol% or less, preferably 30 mol% or less, and more preferably 20 mol% or less, based on all constitutional units.
- components that can be copolymerized include isocarboxylic acid, diphenyl dicarboxylic acid, diphenyl sulfone dicarboxylic acid, diphenyl ether dicarboxylic acid, naphthalene dicarboxylic acid, diphenyl ethane dicarboxylic acid, and disulfonic acid dicarboxylic acid.
- Aromatic dicarboxylic acids such as isophthalic acid; aliphatic dicarboxylic acids such as sebacic acid and adipic acid; and alicyclic dicarboxylic acids such as hexahydroterephthalic acid.
- diols examples include trimethylene dalicol, tetramethylene glycol, hexamethylene glycol, cyclohexane dimethanol, bis-3-hydroxyethylbisphenol, bis_i3-hydroxyethoxydiphenylsulfone, bis / 3-hydroxyethoxy
- diphenyl ether examples include diphenyl ether, diethylene glycol, and polyethylene glycol.
- hydroxycarboxylic acids such as P-hydroxyethoxybenzoic acid can also be mentioned as examples.
- a combination of a trifunctional or higher functional polyfunctional compound and Z or a monofunctional compound is possible as long as the polyester maintains a linear shape.
- trifunctional or higher functional compounds examples include trimesic acid, glycerin, and Penri Erythri!
- monofunctional compounds include diphenyl monocarboxylic acid, diphenyl ether monocarboxylic acid, and phenoxy polyethylene glycol. These various copolymerization components can be used as functional derivatives, for example, in the form of an ester, and they can be used alone or in combination of two or more.
- an aromatic polyester is heated with bis-i3-hydroxyethyl terephthalate and Z or a low condensate thereof to preliminarily decompose the aromatic polyester.
- low-condensate refers to a compound having a low degree of polymerization containing ethylene terephthalate as a main component of a repeating unit and usually being a mixture.
- the degree is from 1 to about 10, more preferably from 1 to about 6, and even more preferably from 1 to about 3.
- the heating is preferably carried out at such a temperature that bis-i3-hydroxysylterephthalate and Z or a low condensate thereof are melted in the reaction system. Specifically, the temperature is about 150 to 265 ° C, more preferably, 200 to 245 ° C.
- the quantitative relationship between the aromatic polyester and the bis-]-hydroxyethyl terephthalate and Z or its low condensate in the pre-decomposition can be varied as required, but usually 1 weight of the aromatic polyester It is preferred to use bis-3-hydroxyethyl terephthalate and Z or a low condensate thereof in an amount of about 0.1 to 4.5 parts by weight, preferably about 0.7 to 1.2 parts by weight, per part.
- the reaction time for the pre-decomposition depends on the quantitative relationship between the aromatic polyester and bis-hydroxyethyl terephthalate and Z or its low condensate, as described above.
- the predecomposition reaction may be carried out under normal pressure or under pressure. It is also possible to carry out the reaction under reduced pressure so that the distillate from the reaction system does not inhibit the progress of the reaction. It is desirable that bis-3-hydroxyethyl terephthalate and Z or its low condensate used in the pre-decomposition reaction do not contain free ethylene dalicol, but a small proportion of ethylene dalicol is present. It is acceptable to do so.
- the ethylene glycol present in a small proportion is such that it does not inhibit the above-mentioned pre-decomposition reaction, and even if it remains as a result of the reaction, it should be added positively. Or a mixture of both.
- the amount that is acceptable is preferably not more than about 1.0 part by weight, more preferably 0.5 part by weight, per part by weight of bis-i3-hydroxyethyl terephthalate and Z or its low condensate. It is as follows. In the predecomposition reaction, the aromatic polyester and bis-] 3-hydroxyethyl terephthalate and Z or a low condensate thereof can be reacted together at once.
- a reaction of reacting the pre-decomposed product with ethylene daricol after the pre-decomposition to decompose the pre-decomposed product into bis-hydroxyhydroxyterephthalate and / or a low-condensation product thereof That is, a reaction is carried out to convert the terephthalic acid component of the pre-decomposed product into bis- (3-hydroxyethyl terephthalate) and / or its low condensate.
- This reaction is preferably carried out at a temperature of 190 to 26 ° C. (more preferably, at a temperature of 200 to 220 ° C.
- Ethylene glycol 0.3 to: L 0.0 parts by weight, more preferably 3.0 to 5.0 parts by weight, in order to obtain good results is desirable.
- the reaction may be carried out under normal pressure or under pressure. A facilities available.
- the distillate from the reaction system is also possible implementation at reduced pressure so as not to inhibit the progress of the reaction.
- reaction catalyst examples include known transesterification catalysts, for example, Zn, Cd, Mn, Co, Ca, B represented by sodium, magnesium methylate, zinc borate, and zinc acetate.
- Fatty acid salts such as a, carbonates, metals Na and Mg, and oxides thereof.
- the addition amount is preferably about 0.05 to 3.0% by weight based on the terephthalate-based polyester as a raw material.
- each reaction of the first method of the present invention is carried out by a so-called batch reaction method in which each raw material having the above-mentioned relation in quantity is supplied into a reaction vessel and reacted, and after the completion of the reaction, it is taken out. It is also possible to apply a so-called continuous reaction system in which the supply and take-out of each raw material are performed continuously, or a combination thereof.
- polyester can be used as various molded products such as fibers, films, and bottles. Furthermore, when depolymerizing various polyester molded products to substantially return to the stage of bis-3-hydroxyethyl terephthalate, the depolymerization step is carried out using ethylene glycol as described above. As a result, the obtained depolymerized product can be obtained as a solution containing ethylene glycol as a main solvent.
- the solution may be used as it is or adjusted to an appropriate concentration, or if necessary, a treatment such as removal of a catalyst may be performed. Moreover, as described in detail below, a step of removing cations and anions may be applied.
- a treatment such as removal of a catalyst
- a step of removing cations and anions may be applied.
- Bis-3-hydroxyethyl terephthalate obtained by applying the first method of the present invention may be subjected to the recrystallization step as it is, or in the form of a solution adjusted to an appropriate concentration. It can be used as at least a part of raw materials for re-producing high-quality polyester by passing through a distillation process. In such a case, the polyester molded product to be depolymerized is mixed with other materials as in the case of a product form, or is mixed with foreign matter such as dust. Even in the state, the present invention can be carried out without any trouble by applying a foreign matter removing step such as sorting or filtering as necessary.
- the polyester may be mixed with heterogeneous fibers or contain inorganic substances such as titanium oxide used in the polyester, or the polyester may be in the form of a film.
- the polyester may be mixed with various film materials such as polyethylene and polyamide, or may contain various lubricants used in polyester. If it is, it may be crushed and mixed with various materials such as polyethylene used for the lid part and the pottom part, or it may be mixed with various materials such as paper and plastic used for labels etc.
- the starting material used in the present invention is a solution composition of bis-i3-hydroxyethyl terephthalate containing ethylene glycol, bis-3-hydroxyethyl terephthalate and cations and / or anions as impurities.
- This solution composition may be prepared by any method.
- it can be composed of a reaction product produced by a direct esterification reaction of ethylene glycol and terephthalic acid, or a transesterification reaction of ethylene glycol and dimethyl terephthalate.
- the polyethylene terephthalate or the waste polyethylene terephthalate which has not become a product is recovered by decomposing polyethylene terephthalate with ethylene glycol, or is composed of a decomposition product obtained by the first method of the present invention. be able to. Also, a mixture of these various origins may be used.
- a solution composition containing bis-i3-hydroxyethyl terephthalate as a main solute produced from unpurified terephthalic acid as terephthalic acid can be highly purified through the method of the present invention.
- reaction products and decomposition products usually contain an esterification catalyst, a transesterification catalyst or a polycondensation catalyst.
- the cationic anion as an impurity in the present invention is usually derived from these catalysts.
- the present invention may contain a cationic anion as an impurity due to the above-mentioned factors, and the present invention is also effective in removing such an impurity.
- the solution composition as a starting material used in the present invention is mainly composed of ethylene glycol and bis-i3-hydroxyethyl terephthalate, and the anion dication as an impurity is bis-1 / 3-hydroxy. It is usually contained at less than 3,000 ppm based on ethyl terephthalate rate. Of these, cations are usually less than 2,500 ppm, and anions are less than 500 ppm, on the same basis.
- the above-mentioned solution composition contains Dalicol or bis-glycol other than ethylene glycol. It may contain a bis compound other than i3-hydroxyethyl terephthalate.
- the solution composition of the present invention is a copolymer in which ethylene terephthalate is the main constituent as a recovered or terephthalate-based waste polyester, and a small proportion of the subordinate constituents is copolymerized. It will be understood from the fact that polymers depolymerized can also be used.
- the terephthalate polyester to be used the same polyesters as described in the first method of the present invention can be exemplified.
- the solution composition targeted in the second method of the present invention contains a copolymer component derived from a terephthalate-based polyester, the dicarbonic acid component as a copolymer component is bis-1 / 3-hydroxy.
- the solution composition targeted in the second method of the present invention contains a copolymer component derived from a terephthalate-based polyester, the dicarbonic acid component as a copolymer component is bis-1 / 3-hydroxy.
- the alcohol component is contained as other dalicol other than ethylene dalicol.
- the solution composition targeted in the second method of the present invention preferably contains bis-i3-hydroxyethylterephthalate in an amount of 5 to 80% by weight based on the solution composition, and 8 to 40% by weight. %, More preferably 10 to 30% by weight.
- the solution composition preferably contains ethylene glycol as a main solvent and bis-) 3-hydroxyethyl terephthalate as a main solute.
- the solution composition is contacted with a cation exchanger and a Z or anion exchanger in the second method of the present invention.
- cation exchanger and the anion exchanger for example, particles, chains, fibers, and the like can be amorphous.
- a particle-shaped ion exchanger it is packed in a column, and the solution composition is passed through the packed column, so that both can be brought into contact with each other.
- a cation exchange resin is preferable, and as the anion exchanger, an anion exchange resin is preferable.
- the cation exchange resin as a cation exchange functional groups, such as single S_ ⁇ 3 H, _ C_ ⁇ _ ⁇ _H, - N (CH 2 C_ ⁇ _OH) include those having 2 or the like as preferable be able to.
- These cation exchange resins include, for example, SK series, PK series, WK series of Diaion (manufactured by Mitsubishi Chemical Corporation), IR series and IRC series of Amberlite (manufactured by Kuchiichi M & Haas Japan KK)
- a commercially available product can be used. Since these commercially available products usually have an ion exchange functional group stabilized as a salt such as a sodium salt, they are usually converted to a free acid group as described above when used.
- anion exchange resin as an anion exchange functional group, for example,
- anion exchange resins include, for example, Diaion (Mitsubishi Chemical Co., Ltd.) SA series, PA series, WA series, and Amberlite (Rohm and Haas Japan Co., Ltd.) IRA series.
- a commercially available product such as IRAC-900 series can be used.
- These commercial products are usually stabilized as having anion-exchange functional groups with halogen anions instead of hydroxide ions (OH_), so they are usually converted to those with hydroxyl anions as described above when used. .
- the anion exchange resin there are a crack type and a non-crack type in gel type, but the non-crack type is more preferable because the adsorption amount of bis-3-hydroxyethyl terephthalate is smaller.
- a porous material a so-called MR type (microporous type), which is an ion exchange resin that has higher physical durability than the gel type and has a high exchange adsorption rate, can also be used.
- MR type microporous type
- Either one of the cation exchanger and the anion exchanger can be used, or both can be used.
- cations and anions are included as impurities.
- the solution composition contains only one ion at a much higher weight than the other ion and the content of the other ion is of no concern, Only ion exchangers can be used.
- both cation and anion exchangers are preferably used.
- the solution composition can be brought into contact with the cation exchanger and the anion exchanger simultaneously or sequentially.
- it is simultaneous when the mixture of the cation exchange resin and the anion exchange resin is brought into contact with the solution composition, and sequentially when the column filled with the cation exchange resin and the column filled with the anion exchange resin are sequentially contacted.
- a sequential contact method in which a cation exchanger is contacted and then an anion exchanger is contacted is preferable.
- the contact between the solvent exchanger and the anion exchanger with the solution composition must be such that no bis-13-hydroxyethyl terephthalate crystals are precipitated from the solvent and the temperature is lower than the maximum operating temperature of the ion exchange resin. It is preferably carried out at a temperature of 20 to 120 ° C, more preferably at a temperature of 30 to 70 ° C.
- the contact can be performed under normal pressure, reduced pressure, and increased pressure. Needless to say, the contact is carried out under conditions such as concentration, temperature, pressure, etc., which maintain the solution composition in a solution state.
- bis-i-hydroxyethyl terephthalate contains only 50 ppm or less of anion and Z or a cation as impurities with respect to bis-iS-hydroxyethyl terephthalate. Hydroxyethyl terephthalate is obtained.
- polyesters obtained by using the bis-1; 3-hydric xyshetyl terephthalate obtained by the second method of the present invention as at least a part of the raw materials for the production thereof include fibers, films and bottles. It can be used without any problems as various molded products such as.
- the solution containing bis-iS-hydroxyethyl terephthalate obtained by depolymerizing the recovered or waste polyester with ethylene glycol or performing the first method of the present invention may be used as it is, or may be suitably bis-l-hydroxy having a low ion content.
- the solution composition before the second method of the present invention is carried out, while the second method of the present invention is carried out, for example, between the contact with the cation exchanger and the contact with the anion exchanger.
- a decolorization step for example, a treatment with activated carbon, is performed on at least one of the target substances obtained by carrying out the second method of the present invention, so that bis_i3-— Hydroxyethyl terephthalate can be obtained.
- Bis / 3-hydroxyethyl terephthalate satisfying a total ion content of 50 ppm or less in the solute obtained by the second method of the present invention, and a total ion content as conventionally generally known
- the behavior of bis_ / 3-hydroxyethyl terephthalate in excess of 50 ppm under the same conditions is surprisingly completely different.
- a solution composition containing crude bis_i3-hydroxyethyl terephthalate containing a cation weight of 2,080 ppm and an anion weight of 22 ppm is treated with a weakened thione, deanion-free bis- (3-hydroxy) solution.
- Bis / 3-hydroxyethyl terephthalate obtained by concentration under the same conditions and subjected to molecular distillation under the same conditions has no color that can be visually identified, and the oligomer formation rate during molecular distillation is, for example, 0.7%. It enables stable continuous operation without deposits sticking to the heat transfer surface of the evaporator.
- the recovery rate of the mouth Kishetir terefu rate was 98.1%.
- the bis_) 3-hydroxyethyl terephthalate having a low ion content obtained by the second method of the present invention is subjected to molecular distillation, bis-j3-hydroxyethyl terephthalate of extremely high purity is obtained.
- molecular distillation is not boiling point distillation at distillation temperature and pressure, that is, equilibrium distillation, but the molecules of bis-iS-hydroxyethyl terephthalate once evaporated are substantially condensed from the evaporation surface without returning to the evaporation surface again.
- Non-equilibrium distillation in which unilateral transfer of molecules to a surface occurs.
- the bis-) 3-hydroxyethyl terephthalate obtained by applying the second method of the present invention may be subjected to the recrystallization step as it is, or in the form of a solution adjusted to an appropriate concentration. It can be used as at least a part of raw materials for re-producing high-quality polyester by passing through a distillation process.
- the content of anion and cation of bis-i3-hydroxyethyl terephthalate is determined and defined as follows.
- ICP-AES Inductively coupled plasma emission spectrometry
- a sample containing ethylene glycol and bis-i3-hydroxyethyl terephthalate was heated to about 80 ° C to make a homogeneous solution. Then, about 11 g of this solution was refined and transferred to a conical beaker. After heating to 220 ° C to remove ethylene glycol, 20 ml of sulfuric acid was added and heated, and nitric acid was added in lm1 units until nitrogen oxides were no longer generated, thereby decomposing organic substances.
- the sample was cooled to room temperature, 5 ml of hydrochloric acid was added, and the weight of the cation was measured by the ICS-AES method using a solution made up to 100 ml with ultrapure water as a test solution.
- the cations to be measured were Na, Mg, Ca, Fe, Co, Zn, Ti, Sn, Sb, Ge and P, and the total weight of them was defined as the cation content.
- the moisture content was measured with a Karl Fischer moisture meter manufactured by Kyoto Electronics Industry.
- the ICS-AES was conducted with an ICAP-5575 made by Nippon Jarel Ash.
- a sample containing ethylene glycol and bis-i3-hydroxyethyl terephthalate was heated to about 80 ° C to obtain a homogeneous solution. Then, about 11 g of this solution was precisely weighed, and 100 ml of ultrapure water was added. Was added and shaken to extract the ionic components into the aqueous phase.
- the extracted aqueous phase was filtered through a 0.2-m medium filter, and the weight of anion was measured by ion chromatography.
- Anion intended for measurement is C 1, B r, F, N0 2, N0 3, P0 4 and S_ ⁇ 4 and their total weight and Anion content.
- the ion chromatograph used was an IC-7000 S type manufactured by Yokogawa Electric Corporation. Measurements column Daionekusu Co. I onP ac AS 4A- SC in N_ ⁇ 2, NO 3, P0 4, C l, the B r was measured, measured F in Daionekusu Co. I on P ac AS 1 2 A did.
- the mixture containing bis- (1-hydroxyethyl terephthalate) to be distilled and purified has a total content of cation and anion of 50 ppm or less and a content of ethylene glycol of 10 ppm or less. It also contains more than 20% by weight and compounds having a lower boiling point than bis / 3-hydroxyethyl terephthalate.
- a bis-1-hydroxyethyl terephthalate-containing mixture can be prepared by performing the second method of the present invention.
- the measuring method and definition of the cations and anions and their contents in the third method of the present invention are the same as those described above for the second method.
- the total ion content is preferably 40 ppm or less, more preferably 30 ppm or less.
- the total content of anion is suitably 1 Ppm or less.
- an ion exchanger particularly an ion exchange resin.
- the composition containing bis- (3-hydroxyethyl terephthalate) is substantially dissolved in a solution containing ethylene glycol as a main solvent and bis- (3-hydroxyethyl terephthalate as a main solute. It is practical to treat the weakened thione and Z or deanioned steel. At that time, the weakening thione treatment and / or The order does not matter, whichever comes first or after. Also, they may be performed simultaneously.
- Examples of the ion exchange resin for weakening thione suitable for such an embodiment include the same Amberlite cation exchange resin (manufactured by Rohm and Haas Japan KK) as exemplified for the second method, and ion exchange resin for deanion.
- Examples of the resin include Amberlite anion exchange resin (manufactured by Rohm and Haas Japan KK). The process using such an ion exchange resin can be performed by applying a method known per se, but when performing the weakening thione and / or the deanioning operation, ethylene glycol is used as a main solvent.
- the mixture containing crude bis / 3-hydroxyethyl terephthalate contains ethylene glycol in an amount of more than 10% by weight, preferably 30% by weight. It is advantageous to contain more than that.
- the content of ethylene glycol in the deionization treatment keeps the solution state without depositing bis- / 3-hydroxyethyl terephthalate, achieves the deionization effect, and stabilizes the deionization operation. It is desirable to implement.
- a decolorization treatment before or after, preferably before the deionization treatment.
- an adsorbent treatment such as an activated carbon treatment is advantageous.
- the crude bis-i3-hydroxyethyl terephthalate-containing mixture obtained by the deionization treatment contains ethylene dalicol in the above range, but the total content of the cation and anion is 50 ppm or less. Has been reduced to
- a compound having a boiling point lower than that of bis-3-hydroxyethyl terephthalate is distilled off by subjecting the mixture to initial evaporation or distillation.
- a temperature of 170 ° C or less As the temperature and the pressure, conditions for distilling off ethylene dalicol and compounds having a boiling point lower than that in the mixture are selected. Specifically, a temperature of 170 ° C or less, The temperature is preferably 100 to 150 ° C, and the pressure is preferably 40,000 Pa (30 OmmHg), more preferably 20,000 Pa (15 OmmHg) or less, and particularly preferably 130 P or less as absolute pressure. a (ImmHg) to 13,300 Pa (10 OmmHg) is desirable.
- This initial evaporation or distillation is preferably carried out such that the ethylene glycol content in the mixture is not more than 10% by weight, more preferably not more than 5% by weight, particularly preferably not more than 2% by weight.
- ethylene glycol content in the mixture is not more than 10% by weight, more preferably not more than 5% by weight, particularly preferably not more than 2% by weight.
- the component copolymerized with the polyester is removed.
- the third component include those listed in the various components described below, and among them, isofluoric acid, 1,4-cyclohexanedimethanol and the like are substantially used. Elimination can be of great benefit.
- the evaporation or distillation residue obtained in the initial evaporation or distillation obtained as described above is further subjected to evaporation or distillation under reduced pressure to purify the purified bis- (3-hydroxyethyl tereph). Get the evening rate.
- the crude bis / 1 / 3-hydroxyethyl terephthalate, which is the evaporation or distillation residue contains less than 50 ppm, preferably less than 4 Oppm, more preferably less than 30 ppm of cations and Z or anion in total. It is contained below pm.
- the mixture having a cation and anion content of 50 ppm or less is directly subjected to evaporation or distillation under reduced pressure without subjecting to the above-mentioned initial evaporation or distillation, the evaporation or distillation operation under reduced pressure can be efficiently performed. It is difficult to proceed, and it is not advantageous for obtaining high-quality objects.
- the evaporation or distillation temperature under reduced pressure is preferably in the range of 130 to 250 ° C, 1 60 to 220.
- the range of C is more preferred.
- the pressure is preferably a reduced pressure of 300 Pa (2.25 mmHg) (absolute pressure) or less, and a pressure range of 70 Pa (0.5 mmHg) (absolute pressure) or less. Is more advantageous.
- the average residence time of bis-hydroxyethyl terephthalate in the evaporator or the evaporator is advantageously less than 2 hours, preferably less than 1.5 hours.
- Purified bis-1-hydroxysylterephthalate recovered by evaporation or distillation purification under reduced pressure is of extremely high quality, and the total content of the cation and anion is 15 ppm or less, preferably 5 ppm or less. . Further, the content of bis-) 3-hydroxyethyl terephthalate is 97% by weight or more, preferably 98% by weight or more.
- the purified bis- (3-hydroxyethyl terephthalate) thus obtained is used for the production of polyethylene terephthalate or its copolymerized polyester.
- the purified bis-3-hydroxyethyl terephthalate obtained by the third method of the present invention is suitable for being used as at least a part of a raw material of a polyester widely used in various applications as described above.
- purified bis-13-hydroxide xishethyl terephthalate can be polymerized as it is in the presence of a polymerization catalyst, or can be polymerized together with terephthalic acid in the presence of a polymerization catalyst.
- the polymerization catalyst those known per se can be used. For example, antimony compounds, titanium compounds and germanium compounds can be used.
- Such polyesters are those having ethylene terephthalate as a main constituent unit, and include those obtained by copolymerizing a small proportion of one or more other constituent components.
- the allowable range of the copolymer component is, for example, usually 40 mol% or less, preferably 30 mol% or less, more preferably 20 mol% or less, based on all constitutional units.
- components that can be copolymerized include: dicarboxylic acid components such as isofluoric acid, diphenyldicarbonic acid, diphenylsulfonedicarboxylic acid, diphenylesterdicarboxylic acid, naphthalenedicarboxylic acid, and diphenoxenedicarboxylic acid.
- Acids aromatic dicarboxylic acids such as sodium sulfoisophthalic acid; Sebacic acid, adipic acid Aliphatic dicarboxylic acids; examples thereof include alicyclic dicarboxylic acids such as hexahydroterephthalic acid.
- diols such as trimethylene glycol, tetramethylene glycol, hexamethylene glycol, cyclohexane dimethanol, bis_i3-hydroxyethylbisphenol A, and bis-one) 3-hydroxyethoxydiphenylsulfone And bis-1 / 3-hydroxyethoxydiphenyl ether, diethylene glycol, polyethylene glycol and the like.
- hydroxycarboxylic acids such as p-hydroxyethoxyphenylcarboxylic acid can also be mentioned as examples.
- a combination of a trifunctional or higher functional polyfunctional compound and Z or a monofunctional compound as long as the polyester maintains the linear shape.
- trifunctional or higher-functional polyfunctional compounds include trimesic acid, glycerin, and pen-erythritol
- monofunctional compounds include diphenyl monocarboxylic acid, diphenyl ether monocarboxylic acid, and phenoxy polyethylene glycol. And the like.
- These various copolymer components can be used as functional derivatives, for example, in the form of an ester, and they may be used alone or in combination of two or more.
- polyesters obtained by using the purified bis / 1 / 3-hydroxyethyl terephthalate obtained by the third method of the present invention as at least a part of the raw materials for the production thereof include fibers and films. It can be used very advantageously as various molded articles such as bottles and bottles.
- the fourth method of the present invention will be understood from the description of the third method of evaporation or distillation under reduced pressure.
- the purified and high-purity bis-i3-hydroxyethylteref having a total content of cations and anions of 15 ppm or less as described above.
- a sauce is advantageously provided.
- This purified bis_i3-hydroxyethyl terephthalate preferably has a total content of cation and anion of 5 ppm or less. Further, the content of the bis / 1-hydroxyethyl terephthalate is preferably 97% by weight or more.
- the purified bis-1 / 3-hydroxyethyl terephthalate of the present invention is polyethylene Can be used for the manufacture of terephthalate rates. That is, polyethylene terephthalate can be produced by polymerizing the purified bis- (3-hydroxyethyl terephthalate) of the present invention in the presence of a polycondensation catalyst. Hydroxyethyl terephthalate and terephthalic acid can be polymerized in the presence of a polycondensation catalyst to produce polyethylene terephthalate.
- the oligomer was depolymerized by stirring.
- undecomposed polyethylene terephthalate was not visually observed, and the depolymerized solution was transparent.
- the temperature was further lowered to 55 ° C, and ethylene glycol was used as a main solvent, and bis-0-hydroxyethyl terephthalate was used as a main solute.
- the entire amount of this solution was decolorized with activated carbon at a temperature of 55 ° C, and further deionized with a thion exchange resin (Amberlite IR120-B manufactured by Rohm and Haas Japan KK), followed by anion exchange.
- a thion exchange resin Amberlite IR120-B manufactured by Rohm and Haas Japan KK
- the optical density in Table 1 is a method for evaluating the quality of bis-3-hydroxyethyl terephthalate, and is an amount proportional to the content of coloring matter.
- the absorbance of a 10% methanol solution was measured at a wavelength of 380 xm and a cell length of 1 Omm.
- the whiteness was measured with a colorimeter and expressed as L (brightness), a (redness), and b (yellowness) values according to the Han-Yuichi method.
- 500 g of the obtained room temperature powder of the purified bis- ⁇ -hydroxyethyl terephthalate was put into a l, 000 cc glass polymerization apparatus equipped with a stirrer, and was sufficiently replaced with nitrogen gas.
- the hexagonal ethylene glycol 2.7 g of a solution of 0.2 parts by weight of germanium dioxide in which crystalline germanium dioxide was completely dissolved was added as a polymerization catalyst in a nitrogen gas atmosphere, and the mixture was stirred for 20 minutes and stirred for 20 minutes to obtain the boiling point of ethylene glycol (197 ° C).
- the mixture was heated and stirred at normal pressure and at 197 ° C for 45 minutes to obtain an oligomer of polyethylene terephthalate.
- this oligomer was polycondensed at 280 ° (: 90 Pa (0.7 mmHg)) for 2 hours to obtain polyethylene terephthalate.
- the quality analysis value of the obtained polyethylene terephthalate is shown in Table 1. It is described in 2. Purified bis-) 3-hydroxyethyl terephthalate and polyethylene terephthalate both had extremely high quality levels in practical use. Table 2
- the intrinsic viscosities in Table 2 were measured in orthochlorophenol at 30 ° C.
- the whiteness was measured with a colorimeter and expressed as L (brightness), a (redness), and b (yellowness) values according to the Han-Yuichi method.
- the temperature of the depolymerized solution was lowered to 55 ° C, and the entire amount was decolorized with activated carbon at a temperature of 55 ° C.
- Desaturation was carried out using Amberlite IR 120-B manufactured by M & H Haas Japan Co., Ltd., followed by deanioning using an anion exchange resin (Amberlite manufactured by Rohm and Haas Japan K.K.). Undecomposed products were instantaneously blocked by the ion exchange resin, and stable operation was impossible.
- ethylene glycol was distilled off until the residual weight of ethylene glycol in the solution became 20% by weight. Thereafter, conditions bis heat transfer area 0. 5 m 2 by a vacuum thin-film evaporator 1 50 ° C, 2 OOP a (1. 5mmH) - 3-hydroxybutyric E substance content of lower boiling point than the boiling point of the chill terephthalate It was concentrated to 5.0% by weight to obtain 31.6 kg of a composition containing bis-i3-hydroxyethyl terephthalate.
- the optical density in Table 4 is a method for evaluating the quality of bis-i3-hydroxyethyl terephthalate, and is an amount proportional to the content of coloring matter.
- the absorbance of a 10% methanol solution was measured at a wavelength of 380 xm and a cell length of 10 mm.
- the whiteness was measured with a colorimeter and expressed as the L (brightness), a (redness), and b (yellowness) values of the eight-point method.
- the intrinsic viscosities in Table 5 were measured in orthochlorophenol at 30 ° C.
- the whiteness was measured with a colorimeter and expressed as L (brightness), a (redness), and b (yellowness) values according to the Yan-Yuichi method.
- Example 2 100 kg of the stock solution decolorized in Example 2 was subjected to the same operation as in Example 2 without deanioning only by deionizing thione. Table 6 shows the operation results at this time. Table 6 Amount of liquid treated by molecular distillation machine (kg) 21
- Example 7 The same operation as in Example 2 was performed without de-ionizing and de-ionizing 100 kg of the stock solution decolorized in Example 2. Table 7 shows the operation results at this time. Table 7 Treatment volume in molecular distillation machine (kg) 21
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Polyesters Or Polycarbonates (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Description
Claims
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/622,518 US6630601B1 (en) | 1999-08-04 | 1999-12-24 | Methods for the preparation or purification of bis-β-hydroxyethyl terephthalate |
DE69920025T DE69920025T2 (de) | 1999-08-04 | 1999-12-24 | Verfahren zur herstellung oder reinigung von bis-(beta)-hydroxyethylterephthalat |
AT99961372T ATE275538T1 (de) | 1999-08-04 | 1999-12-24 | Verfahren zur herstellung oder reinigung von bis- (beta)-hydroxyethylterephthalat |
AU18005/00A AU764053B2 (en) | 1999-08-04 | 1999-12-24 | Methods for the preparation or purification of bis-beta-hydroxyethyl terephthalate |
EP99961372A EP1120394B1 (en) | 1999-08-04 | 1999-12-24 | Methods for the preparation or purification of bis-(beta)-hydroxyethyl terephthalate |
CA002318761A CA2318761A1 (en) | 1999-08-04 | 1999-12-24 | Bis-beta-hydroxyethyl terephthalate production process and purification process |
HK02101199.5A HK1040236A1 (zh) | 1999-08-04 | 2002-02-19 | 雙-β-羥乙基對苯二甲酸酯的製造方法及精製方法 |
US10/623,002 US7193104B2 (en) | 1999-08-04 | 2003-07-18 | Bis-β-hydroxyethyl terephthalate production process and purification process |
Applications Claiming Priority (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22080499A JP2001048837A (ja) | 1999-08-04 | 1999-08-04 | イオン含有量の少ないビス−β−ヒドロキシエチルテレフタレートの製造法 |
JP11/220804 | 1999-08-04 | ||
JP11/222664 | 1999-08-05 | ||
JP11/222663 | 1999-08-05 | ||
JP22266499A JP3782906B2 (ja) | 1999-08-05 | 1999-08-05 | 粗ビス−β−ヒドロキシエチルテレフタレート精製方法 |
JP22266399A JP3782905B2 (ja) | 1999-08-05 | 1999-08-05 | 粗ビス−β−ヒドロキシエチルテレフタレートの精製方法および精製ビス−β−ヒドロキシエチルテレフタレート |
JP11/226033 | 1999-08-10 | ||
JP22603399A JP3782907B2 (ja) | 1999-08-10 | 1999-08-10 | ビス−β−ヒドロキシエチルテレフタレートおよび/またはその低縮合物の製造法 |
Related Child Applications (3)
Application Number | Title | Priority Date | Filing Date |
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US09622518 A-371-Of-International | 1999-12-24 | ||
US09/622,518 A-371-Of-International US6630601B1 (en) | 1999-08-04 | 1999-12-24 | Methods for the preparation or purification of bis-β-hydroxyethyl terephthalate |
US10/623,002 Division US7193104B2 (en) | 1999-08-04 | 2003-07-18 | Bis-β-hydroxyethyl terephthalate production process and purification process |
Publications (2)
Publication Number | Publication Date |
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WO2001010812A1 true WO2001010812A1 (fr) | 2001-02-15 |
WO2001010812A9 WO2001010812A9 (fr) | 2001-04-26 |
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Application Number | Title | Priority Date | Filing Date |
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PCT/JP1999/007284 WO2001010812A1 (fr) | 1999-08-04 | 1999-12-24 | PREPARATION OU PURIFICATION DE BIS-β-HYDROXYETHYL TEREPHTALATE |
Country Status (13)
Country | Link |
---|---|
US (2) | US6630601B1 (ja) |
EP (1) | EP1120394B1 (ja) |
KR (3) | KR100740060B1 (ja) |
CN (3) | CN1511823A (ja) |
AT (1) | ATE275538T1 (ja) |
AU (1) | AU764053B2 (ja) |
CA (1) | CA2318761A1 (ja) |
DE (1) | DE69920025T2 (ja) |
ES (1) | ES2228142T3 (ja) |
HK (1) | HK1040236A1 (ja) |
ID (1) | ID26736A (ja) |
TW (1) | TW506968B (ja) |
WO (1) | WO2001010812A1 (ja) |
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WO2003101929A1 (fr) * | 2002-06-04 | 2003-12-11 | Aies Co., Ltd. | Procedes de purification de bis(2-hydroxyethyl)terephtalate |
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FR3130278A1 (fr) | 2021-12-10 | 2023-06-16 | IFP Energies Nouvelles | Procede de production d’un polyester ayant une temperature de cristallisation reduite |
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KR20230149644A (ko) | 2022-04-20 | 2023-10-27 | 에스케이케미칼 주식회사 | 재생 비스(2-히드록시에틸)테레프탈레이트를 포함하는 폴리에스테르 수지 및 이를 이용한 필름 |
EP4276131A1 (en) | 2022-05-10 | 2023-11-15 | Polymetrix AG | Method for the preparation of a polyester |
WO2023217707A1 (en) | 2022-05-10 | 2023-11-16 | Polymetrix Ag | Method for the preparation of a polyester |
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- 1999-12-24 ID IDW20001563A patent/ID26736A/id unknown
- 1999-12-24 CN CNA2004100013328A patent/CN1511823A/zh active Pending
- 1999-12-24 DE DE69920025T patent/DE69920025T2/de not_active Expired - Lifetime
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- 1999-12-24 KR KR1020007009039A patent/KR100701842B1/ko active IP Right Grant
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- 1999-12-24 AT AT99961372T patent/ATE275538T1/de not_active IP Right Cessation
- 1999-12-24 CN CNA2004100013313A patent/CN1511821A/zh active Pending
- 1999-12-24 AU AU18005/00A patent/AU764053B2/en not_active Expired
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- 1999-12-24 EP EP99961372A patent/EP1120394B1/en not_active Expired - Lifetime
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US3884850A (en) * | 1970-02-13 | 1975-05-20 | Fiber Industries Inc | Continuous atmospheric depolymerization of polyester |
JPS4915255B1 (ja) * | 1970-07-23 | 1974-04-13 | ||
JPS4936646A (ja) * | 1972-08-10 | 1974-04-05 | ||
US4078143A (en) * | 1976-01-09 | 1978-03-07 | E. I. Du Pont De Nemours And Company | Process for depolymerizing waste ethylene terephthalate polyester |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7306738B2 (en) | 2001-12-18 | 2007-12-11 | Aies Co., Ltd. | Method of deionizing solution yielded by polyester decomposition with ethylene glycol |
US7235622B2 (en) | 2003-10-08 | 2007-06-26 | Pet Rebirth Co., Ltd. | Polyethylene terephthalate for molding and production the same |
WO2020156966A1 (fr) | 2019-02-01 | 2020-08-06 | IFP Energies Nouvelles | Procédé de production d'un polyester téréphtalate à partir d'un mélange monomérique comprenant un diester |
FR3092323A1 (fr) | 2019-02-01 | 2020-08-07 | IFP Energies Nouvelles | Procédé de production d’un polyester téréphtalate à partir d’un mélange monomérique comprenant un diester |
Also Published As
Publication number | Publication date |
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ID26736A (id) | 2001-02-08 |
KR20010086254A (ko) | 2001-09-10 |
CN1320113A (zh) | 2001-10-31 |
KR100701842B1 (ko) | 2007-04-02 |
DE69920025T2 (de) | 2005-09-08 |
TW506968B (en) | 2002-10-21 |
CN1511821A (zh) | 2004-07-14 |
ES2228142T3 (es) | 2005-04-01 |
KR100740059B1 (ko) | 2007-07-16 |
US20040019234A1 (en) | 2004-01-29 |
EP1120394B1 (en) | 2004-09-08 |
HK1040236A1 (zh) | 2002-05-31 |
CA2318761A1 (en) | 2001-02-04 |
KR100740060B1 (ko) | 2007-07-16 |
AU1800500A (en) | 2001-03-05 |
EP1120394A4 (en) | 2002-07-24 |
US7193104B2 (en) | 2007-03-20 |
KR20060107858A (ko) | 2006-10-16 |
US6630601B1 (en) | 2003-10-07 |
CN1511823A (zh) | 2004-07-14 |
CN1195727C (zh) | 2005-04-06 |
AU764053B2 (en) | 2003-08-07 |
KR20060107859A (ko) | 2006-10-16 |
ATE275538T1 (de) | 2004-09-15 |
DE69920025D1 (de) | 2004-10-14 |
EP1120394A1 (en) | 2001-08-01 |
WO2001010812A9 (fr) | 2001-04-26 |
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