JP5839805B2 - Method for producing sulfolane compound - Google Patents

Description

  The present invention relates to a method for producing a sulfolane compound.

Sulfolane compounds are used in extraction solvents such as benzene, toluene and xylene, solvents for liquid crystal and semiconductor production, reaction solvents for aromatic compounds, and production intermediates for pest control agents.
Examples of the method for producing a sulfolane compound include a method in which a diene compound and sulfur dioxide are reacted to form a sulfolene compound, and then the sulfolene compound is hydrogenated to obtain a sulfolane compound. However, in the hydrogenation reaction of the sulfolene compound, if sulfur dioxide, which is a raw material of the sulfolene compound, remains, the hydrogenation catalyst such as a metal catalyst used in the hydrogenation reaction is poisoned. There were problems such as the need to add a large amount of hydrogenation catalyst. Therefore, as a method for producing a sulfolane compound, a diene compound and sulfur dioxide are reacted to form a sulfolene compound, and then sulfur dioxide remaining in the reaction system is removed by introducing an inert gas before the hydrogenation reaction. A method has been proposed (Patent Document 1).

JP-A-6-321936

  An object of this invention is to provide the manufacturing method of the sulfolane compound which can obtain a sulfolane compound with a high yield by an industrially advantageous method.

The present invention includes a step 1 in which a conjugated diene compound represented by the following formula (1) and sulfur dioxide are reacted to obtain a sulfolene compound represented by the following formula (2), and a liquid temperature of 20 to 150 ° C. Into the sulfolene compound solution represented by the formula (2), 250 to 2500 mL / min of air is introduced for 10 to 360 minutes with respect to 100 g of the sulfolene compound represented by the following formula (2) to remove residual sulfur dioxide. It is a method for producing a sulfolane compound represented by the following formula (3), which comprises the step 2 and the step 3 of hydrogenating the sulfolene compound represented by the following formula (2) in the presence of a hydrogenation catalyst.

In formula (1), R ^{1 to} R ⁶ each independently represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.

In formula (2), R ^{1 to} R ⁶ represent the same groups as R ^{1 to} R ⁶ in formula (1).

In formula (3), R ^{1 to} R ⁶ represent the same groups as R ^{1 to} R ⁶ in formula (1).
The present invention is described in detail below.

Patent Document 1 describes that in order to remove sulfur dioxide, an impurity removing container is installed and pressurized with an inert gas such as nitrogen. In the removal of sulfur dioxide, generally, the reason for using an inert gas is, for example, when air is used instead of an inert gas, and hydrogenation reaction of a sulfolene compound such as sulfuric acid by oxidation of sulfur dioxide. It is conceivable to prevent the formation of a compound that easily inhibits the reaction. However, the method disclosed in Patent Document 1 requires a container for removing impurities that can withstand pressurization and an inert gas supply facility, which is economically burdensome.
By introducing air under specific conditions instead of an inert gas, the present inventors can sufficiently remove sulfur dioxide without the need for an impurity removal container or a gas supply facility. It has been found that sulfolane compounds can be obtained in high yields by an advantageous method, and the present invention has been completed.

  The manufacturing method of the sulfolane compound of this invention has the process 1 which obtains the sulfolene compound represented by the said Formula (2) by making the conjugated diene compound represented by the said Formula (1) and sulfur dioxide react.

Examples of the alkyl group having 1 to 6 carbon atoms represented by R ^{1 to} R ⁶ in the formula (1) include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, and a tert group. -A butyl group, n-hexyl group, etc. are mentioned.
Specific examples of the conjugated diene compound represented by the formula (1) include 1,3-butadiene, 2-methyl-1,3-butadiene, 2-ethyl-1,3-butadiene, and 2-propyl. -1,3-butadiene, 2-butyl-1,3-butadiene, 2-isobutyl-1,3-butadiene, 2-tert-butyl-1,3-butadiene, 2-hexyl-1,3-butadiene, 2 , 3-dimethyl-1,3-butadiene, 2,3-diethyl-1,3-butadiene, 2,3-dibutyl-1,3-butadiene, 2-methyl-3-hexyl-1,3-butadiene, 2, , 4-hexadiene, 3-methyl-2,4-hexadiene, 3-hexyl-2,4-hexadiene, 3,4-dimethyl-2,4-hexadiene, 3,5-octadiene, 3-methyl-3,5 -Ok Diene, 3,6-dimethyl-3,5-octadiene, 4,5-dimethyl-3,5-octadiene, 4,6-decadiene, 5-methyl-4,6-decadiene, 5,6-dimethyl-4, And 6-decadiene.

  In the reaction of the conjugated diene compound and sulfur dioxide in Step 1, the use ratio of sulfur dioxide is not particularly limited, but is preferably 0.5 to 10 moles per mole of the conjugated diene compound. More preferably, the ratio is from 75 to 5 mol. When the use ratio of the sulfur dioxide is less than 0.5 mol, the yield of the sulfolene compound represented by the formula (2) (hereinafter also simply referred to as sulfolene compound) may be reduced. When the use rate of the sulfur dioxide exceeds 10 moles, there is no effect corresponding to the use amount, which is not economical.

  In the reaction of the conjugated diene compound and sulfur dioxide in Step 1, a polymerization inhibitor may be added. Examples of the polymerization inhibitor include t-butyl alcohol and ferrocene.

  Specific examples of the sulfolene compound represented by the formula (2) include, for example, 3-sulfolene, 3-methyl-3-sulfolene, 3-ethyl-3-sulfolene, 3-propyl-3-sulfolene, and 3-butyl. -3-sulfolene, 3-isobutyl-3-sulfolene, 3-tert-butyl-3-sulfolene, 3-hexyl-3-sulfolene, 3,4-dimethyl-3-sulfolene, 3,4-diethyl-3-sulfolene 3,4-dibutyl-3-sulfolene, 3-hexyl-4-methyl-3-sulfolene, 2,5-dimethyl-3-sulfolene, 2,3,5-trimethyl-3-sulfolene, 2,5-dimethyl -3-hexyl-3-sulfolene, 2,3,4,5-tetramethyl-3-sulfolene, 2,5-diethyl-3-sulfone Olene, 2,5-diethyl-2-methyl-3-sulfolene, 2,5-diethyl-2,5-dimethyl-3-sulfolene, 2,5-diethyl-3,4-dimethyl-3-sulfolene, 2, 5-diethyl-3-sulfolene, 2,5-dipropyl-3-sulfolene, 2,5-dipropyl-3-methyl-3-sulfolene, 2,5-dipropyl-3,4-dimethyl-3-sulfolene, etc. It is done.

The method for producing a sulfolane compound according to the present invention comprises 15 to 15 g of a sulfolene compound represented by the above formula (2) in a sulfone compound solution represented by the following formula (2) having a liquid temperature of 20 to 150 ° C. It has the process 2 which introduce | transduces 2500 mL / min air for 10 to 360 minutes, and removes a residual sulfur dioxide.
Nitrogen gas containing 99% or more of N ₂ is not included in “air” in this specification. Further, gas that requires a storage container such as a cylinder is not included in the “air” in this specification.

  In the method for producing a sulfolane compound of the present invention, examples of the solvent used in the sulfone compound solution include alcohols such as methanol, ethanol, isopropanol, propanol, butanol, pentanol, sulfolane, 2-methylsulfolane, 3- Examples include sulfone compounds such as methyl sulfolane and 3-ethyl sulfolane, organic amide compounds such as N-methyl-2-pyrrolidone and N, N-dimethylformamide, and water. Among these, water is preferably used from the viewpoint of price and ease of handling.

  Although the usage-amount of the said solvent is not specifically limited, It is preferable that it is 10-8000 weight part with respect to 100 weight part of sulfone compounds, and it is more preferable that it is 20-4000 weight part. When the amount of the solvent used is less than 10 parts by weight, the reaction may not proceed smoothly due to the precipitation of raw materials, and the yield may decrease. When the amount of the solvent used exceeds 8000 parts by weight, the volumetric efficiency is deteriorated and there is no effect corresponding to the amount used, which is not economical.

  The introduction speed of the air introduced into the sulfolene compound solution is 15 to 2500 mL / min, preferably 500 to 1600 mL / min, with respect to 100 g of the sulfolene compound. When the amount of introduced air is less than 15 mL / min, it takes time to remove sulfur dioxide, or a product such as sulfuric acid that inhibits the reaction of hydrogenating the sulfolene compound is generated. When the amount of air introduced exceeds 2500 ml / min, there is no effect commensurate with the amount used.

  The introduction time of the air is 10 to 360 minutes, preferably 30 to 240 minutes. When the introduction time of the air is less than 10 minutes, sulfur dioxide is not sufficiently removed. When the introduction time of the air exceeds 360 minutes, a product such as sulfuric acid that inhibits the reaction of hydrogenating the sulfolene compound may be generated, and there is no effect corresponding to the introduction time.

  The liquid temperature when air is introduced into the sulfolene compound solution is 20 to 150 ° C, preferably 30 to 50 ° C. When the liquid temperature is lower than 20 ° C., it takes time to remove sulfur dioxide, or a product such as sulfuric acid that inhibits the hydrogenation reaction is generated. When the liquid temperature exceeds 150 ° C., the sulpholene compound may be decomposed, and the side reaction proceeds more rapidly to lower the pH, or sulfuric acid that inhibits the reaction of hydrogenating the sulpholene compound is generated.

  Examples of the method for introducing air into the sulfolene compound solution include a method of introducing air from a cylinder such as a Pasteur pipette into the reaction vessel.

  The manufacturing method of the sulfolane compound of this invention has the process 3 which hydrogenates the sulfolene compound represented by said Formula (2) in presence of a hydrogenation catalyst.

  Examples of the method for hydrogenating the sulfolene compound in the step 3 include a method in which hydrogen gas is introduced into a reaction vessel in the presence of a hydrogenation catalyst and reacted in a hydrogen atmosphere.

  The hydrogenation catalyst is not limited as long as it is generally used for catalytic hydrogenation reaction. For example, metals and metal compounds such as nickel, palladium, rhodium, ruthenium and platinum can be used. Examples of the form include fine powders, activated carbon, aluminum oxide, silica gel, diatomaceous earth, zeolite and other supports, and phosphine, amine complexes and the like. . Specific examples include Raney nickel, nickel carbon, palladium carbon, palladium chloride, palladium acetate, ruthenium carbon, rhodium carbon, and platinum carbon. These hydrogenation catalysts may be used individually by 1 type, and may be used in combination of 2 or more type.

  Although the usage-amount of the said hydrogenation catalyst is not specifically limited, It is preferable that it is 0.1-6.0 weight part with respect to 100 weight part of sulfone compounds, and it is 0.2-3.0 weight part. More preferred. When the usage-amount of the said hydrogenation catalyst is less than 0.1 weight part, there exists a possibility that reaction may not fully complete and the yield of a sulfolane compound may fall. When the usage-amount of the said hydrogenation catalyst exceeds 6.0 weight part, there is no effect corresponding to a usage-amount and it is not economical.

The pressure in the reaction vessel is usually 0.1 to 6 MPa in a hydrogen atmosphere. In the present specification, the pressure in the reaction vessel is represented by a gauge pressure based on the atmospheric pressure (the atmospheric pressure is 0).
The reaction temperature in the reaction for hydrogenating the sulfolene compound is preferably 0 to 150 ° C, and more preferably 15 to 100 ° C. When the reaction temperature in the reaction for hydrogenating the sulfolene compound is less than 0 ° C., the reaction is insufficient and the yield may be reduced. When the reaction temperature in the reaction of hydrogenating the sulfolene compound exceeds 150 ° C., the sulfolene compound is decomposed and a by-product is produced, which may reduce the yield.
The reaction time in the reaction of hydrogenating the sulfolene compound varies depending on the reaction temperature and the like, but is usually 50 to 300 minutes.

  After the reaction for hydrogenating the sulfolene compound, the hydrogen gas remaining in the reaction vessel is purged, the reaction solution is filtered, and the solvent is distilled off under reduced pressure to remove the sulfolane compound represented by the formula (3). Is obtained.

  Examples of the sulfolane compound represented by the formula (3) include sulfolane, 3-methyl sulfolane, 3-ethyl sulfolane, 3-propyl sulfolane, 3-butyl sulfolane, 3-isobutyl sulfolane, 3-tert-butyl. Sulfolane, 3-hexyl sulfolane, 3,4-dimethyl sulfolane, 3,4-diethyl sulfolane, 3,4-dibutyl sulfolane, 3-hexyl-4-methyl sulfolane, 2,5-dimethyl sulfolane 2,3,5-trimethylsulfolane, 2,5-dimethyl-3-hexylsulfolane, 2,3,4,5-tetramethylsulfolane, 2,5-diethylsulfolane, 2,5-diethyl- 2-methylsulfolane, 2,5-diethyl-2,5-dimethylsulfolane, 2,5-diethyl-3 4- dimethyl sulphoxide orchid, 2,5 dipropyl Gandolfo run, 2,5-dipropyl-3-methyl sulfonium orchids, 2,5-dipropyl-3,4-dimethyl sulphoxide run and the like.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the sulfolane compound which can obtain a sulfolane compound with a high yield can be provided by an industrially advantageous method.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to these examples.

(Example 1)
(Preparation of aqueous solution of sulfolene)
A 2 L stainless steel autoclave equipped with a stirrer, thermometer, pressure gauge and heater was charged with 0.744 g (4 mmol) of ferrocene and charged with 308 g of sulfur dioxide. Next, the temperature of the autoclave was raised to 100 ° C., and 216 g (4.0 mol) of 1,3-butadiene was injected at a rate of 1.52 g / min using a pump, followed by stirring at 100 ° C. for 1 hour. During this time, the pressure in the autoclave was 2.7 to 0.7 MPa.
Next, after releasing the pressure in the autoclave, 600 g of water was added as a solvent, cooled to 60 ° C., and the polymer was filtered to obtain an aqueous 3-sulfolene solution. When 3-sulfolene in 1012 g of the obtained 3-sulfolene aqueous solution was quantified by an absolute calibration curve method of high performance liquid chromatography, the content was 412 g (3.48 mol), and the yield was 87%. Moreover, when the residual amount of sulfur dioxide in the obtained 3-sulfolene aqueous solution was quantified by the absolute calibration curve method of ion chromatography, it was 30.74 g and the concentration was 3.04% by weight.

(Removal of residual sulfur dioxide)
Next, 150 g of the obtained 3-sulfolene aqueous solution (3-sulfolene concentration 40.71) was placed in a 500 mL stainless steel autoclave equipped with a stirrer, a pressure gauge, a thermometer, a heater and an air blowing tube having an inner diameter of 1 mm. % By weight). After the liquid temperature was raised to 40 ° C., air blowing was started at an introduction rate of 700 mL / min. Sampling was performed 180 minutes after the start of air blowing, and the residual rate of sulfur dioxide was measured by ion chromatography. As a result, the residual sulfur dioxide was 8 ppm.

(Preparation of sulfolane compound)
Water was added to the 3-sulfolene aqueous solution from which the residual sulfur dioxide had been removed to obtain a 3-sulfolene aqueous solution having a concentration of 32% by weight, and then 0.48 g of Raney nickel catalyst was added as a hydrogenation catalyst. Hydrogen was introduced into the autoclave, pressurized to 1.0 MPa, and stirred at 1000 rpm with a stirrer to initiate a hydrogenation reaction of 3-sulfolene. The reaction temperature was in the range of 30 to 40 ° C. Until the end of the reaction, hydrogen was replenished to maintain the pressure. Sampling was performed every 120 to 30 minutes after the start of the reaction, and the time point at which disappearance of 3-sulfolene was confirmed by gas chromatography was defined as the reaction end point. As a result, the reaction time from the start of the reaction to the end of the reaction was 150 minutes. After the completion of the reaction, the hydrogenation reaction rate was measured by an absolute calibration curve method of gas chromatography and found to be 99.8%.
Thereafter, the metal catalyst in the reaction solution was removed by filtration, and distilled under reduced pressure at 300 mmHg and 160 ° C. to distill off water. Next, the reaction liquid from which water was distilled off was distilled under reduced pressure at 5 mmHg and 135 ° C. to obtain 61.7 g (0.70 mol) of sulfolane.

(Example 2)
Residual sulfur dioxide was removed in the same manner as in Example 1 except that the air introduction rate was 250 mL / min. As a result, the residual sulfur dioxide 180 minutes after the start of air blowing was 56 ppm. Water was added to the 3-sulfolene aqueous solution from which residual sulfur dioxide had been removed to obtain a 3-sulfolene aqueous solution having a concentration of 32% by weight, and then the hydrogenation reaction of 3-sulfolene was carried out in the same manner as in Example 1. As a result, the reaction time was 270 minutes, and when the reaction rate of hydrogenation was measured by the absolute calibration curve method of gas chromatography after completion of the reaction, it was 99.7%.
In addition, vacuum distillation was performed in the same manner as in Example 1 to obtain 61.1 g (0.69 mol) of sulfolane.

(Comparative Example 1)
Residual sulfur dioxide was removed in the same manner as in Example 1 except that the introduced gas was changed from air to nitrogen gas (N ₂ content 99% or more). As a result, the residual sulfur dioxide after 180 minutes from the start of air blowing was 5 ppm. Water was added to the 3-sulfolene aqueous solution from which residual sulfur dioxide had been removed to obtain a 3-sulfolene aqueous solution having a concentration of 32% by weight, and then the hydrogenation reaction of 3-sulfolene was carried out in the same manner as in Example 1. As a result, the reaction time was 150 minutes, and when the reaction rate of hydrogenation was measured by the absolute calibration curve method of gas chromatography after completion of the reaction, it was 99.5%.
Further, vacuum distillation was performed in the same manner as in Example 1 to obtain 61.2 g (0.69 mol) of sulfolane.

(Comparative Example 2)
Residual sulfur dioxide was removed in the same manner as in Example 2 except that the introduced gas was changed from air to nitrogen gas (N ₂ content 99% or more). As a result, the residual sulfur dioxide after 180 minutes from the start of air blowing was 45 ppm. Water was added to the 3-sulfolene aqueous solution from which residual sulfur dioxide had been removed to obtain a 3-sulfolene aqueous solution having a concentration of 32% by weight, and then the hydrogenation reaction of 3-sulfolene was carried out in the same manner as in Example 1. As a result, the reaction time was 240 minutes, and after completion of the reaction, the hydrogenation reaction rate was measured by an absolute calibration curve method of gas chromatography. As a result, it was 99.5%.
In addition, vacuum distillation was performed in the same manner as in Example 1 to obtain 61.4 g (0.70 mol) of sulfolane.

(Comparative Example 3)
Residual sulfur dioxide was removed in the same manner as in Example 1 except that the air introduction rate was 10 mL / min. As a result, the residual sulfur dioxide after 180 minutes from the start of air blowing was 2140 ppm. After adding water to the obtained 3-sulfolene aqueous solution to obtain a 3-sulfolene aqueous solution having a concentration of 32% by weight, a hydrogenation reaction of 3-sulfolene was carried out in the same manner as in Example 1. As a result, the reaction was not completed, and the hydrogenation reaction rate 360 minutes after the start of the reaction was 13%.

(Comparative Example 4)
Residual sulfur dioxide was removed in the same manner as in Example 1 except that the air introduction rate was 2500 mL / min and the air introduction time was 5 minutes. As a result, the residual sulfur dioxide was 1570 ppm. After adding water to the obtained 3-sulfolene aqueous solution to obtain a 3-sulfolene aqueous solution having a concentration of 32% by weight, a hydrogenation reaction of 3-sulfolene was carried out in the same manner as in Example 1. As a result, the reaction was not completed, and the hydrogenation reaction rate 360 minutes after the start of the reaction was 17%.

(Comparative Example 5)
Residual sulfur dioxide was removed in the same manner as in Example 1 except that the air introduction time was 450 minutes and the blowing rate was 280 mL / min. As a result, the residual sulfur dioxide was 2 ppm. Water was added to the 3-sulfolene aqueous solution from which residual sulfur dioxide had been removed to obtain a 3-sulfolene aqueous solution having a concentration of 32% by weight, and then the hydrogenation reaction of 3-sulfolene was carried out in the same manner as in Example 1. As a result, the reaction was not completed, and the hydrogenation reaction rate 360 minutes after the start of the reaction was 12%.

(Comparative Example 6)
Residual sulfur dioxide was removed in the same manner as in Example 1 except that the liquid temperature was 18 ° C. As a result, the residual sulfur dioxide was 996 ppm. Water was added to the 3-sulfolene aqueous solution from which residual sulfur dioxide had been removed to obtain a 3-sulfolene aqueous solution having a concentration of 32% by weight, and then the hydrogenation reaction of 3-sulfolene was carried out in the same manner as in Example 1. As a result, the reaction was not completed, and the hydrogenation reaction rate 360 minutes after the start of the reaction was 33%.

(Comparative Example 7)
The removal operation of residual sulfur dioxide was performed in the same manner as in Example 1 except that the liquid temperature was changed to 160 ° C. As a result, the residual sulfur dioxide was 76 ppm. Water was added to the 3-sulfolene aqueous solution from which residual sulfur dioxide had been removed to obtain a 3-sulfolene aqueous solution having a concentration of 32% by weight, and then the hydrogenation reaction of 3-sulfolene was carried out in the same manner as in Example 1. As a result, the reaction was not completed, and the hydrogenation reaction rate 360 minutes after the start of the reaction was 62%.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the sulfolane compound which can obtain a sulfolane compound with a high yield can be provided by an industrially advantageous method.

Claims (2)

A step 1 of reacting a conjugated diene compound represented by the following formula (1) with sulfur dioxide to obtain a sulfolene compound represented by the following formula (2);
In a sulfolene compound solution represented by the following formula (2) having a liquid temperature of 20 to 150 ° C., 250 to 2500 mL / min of air is added for 10 to 360 minutes with respect to 100 g of the sulfolene compound represented by the following formula (2). Introducing 2 to remove residual sulfur dioxide; and
And a step 3 of hydrogenating a sulfolene compound represented by the following formula (2) in the presence of a hydrogenation catalyst. A method for producing a sulfolane compound represented by the following formula (3).

In formula (1), R ^{1 to} R ⁶ each independently represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.

In formula (2), R ^{1 to} R ⁶ represent the same groups as R ^{1 to} R ⁶ in formula (1).

In formula (3), R ^{1 to} R ⁶ represent the same groups as R ^{1 to} R ⁶ in formula (1). R < ¹ > -R < ⁶ > in Formula (1) is a hydrogen atom, The manufacturing method of the sulfolane compound of Claim 1 characterized by the above-mentioned.