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Method for preparing acetic acid mixed butyl ester by continuous reaction and rectification

A technology for the production of mixed butyl acetate, which is applied in the preparation of carboxylic acid esters, chemical instruments and methods, and the preparation of organic compounds, can solve the problems of large amount of waste water and low yield, achieve clean production, and increase product yield. Efficiency and reduction of equipment maintenance costs

Inactive Publication Date: 2012-09-26
谦信化工集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The present invention aims to provide a production method for preparing mixed butyl acetate by continuous reactive distillation, which can avoid the problems of low yield, serious corrosion and large amount of waste water in the traditional batch production process, and realize clean and environmentally friendly production

Method used

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  • Method for preparing acetic acid mixed butyl ester by continuous reaction and rectification
  • Method for preparing acetic acid mixed butyl ester by continuous reaction and rectification

Examples

Experimental program
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Effect test

Embodiment 1

[0025] The raw material mixed butanol and acetic acid enter the reboiler 1 with a molar ratio of 1:1, and the feed rate is 1500L / h. After mixing and preheating, it enters the esterification reaction kettle 2, and is further heated up under the catalysis of p-toluenesulfonic acid catalyst. The kettle temperature is controlled at 110-115°C, and the reaction product enters the esterification tower 3 in the form of an azeotrope. The tower tank of the esterification tower is 113°C, the middle of the tower is 93°C, and the top of the tower is 90°C. After being condensed and cooled by the condenser 4, the overhead distillate enters the phase separator 5, and the lower water phase is refluxed to the esterification tower at a reflux ratio of 1.1. The rest is sent to the recovery system; the upper oil phase material is refluxed to the top of the esterification tower at a reflux ratio of 2.5, and the rest is sent to the rectification tower 6 as crude mixed butyl acetate for further refine...

Embodiment 2

[0027] The raw material mixed butanol and acetic acid enter the reboiler 1 at a molar ratio of 1:1, and the feed rate is 1000L / h. After mixing and preheating, they enter the esterification reactor 2 and are catalyzed by the mixed catalyst of p-toluenesulfonic acid and methanesulfonic acid. Further temperature-raising reaction is carried out, and the temperature of the kettle is controlled at 105-115°C. After the reaction, the product enters the esterification tower 3 in the form of an azeotrope. The tower tank of the esterification tower is 114°C, the middle of the tower is 95°C, and the top of the tower is 91°C. After being condensed and cooled by the condenser 4, the overhead distillate enters the phase separator 5, and the lower water phase is refluxed to the esterification tower at a reflux ratio of 1.2. The rest is sent to the recovery system; the upper oil phase material is refluxed to the top of the esterification tower at a reflux ratio of 2.0, and the rest is sent ...

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Abstract

The invention relates to a method for preparing acetic acid mixed butyl ester by continuous reaction and rectification. The method includes: acetic acid and mixed butanol are mixed and preheated according to molar ratio of 1:1, and temperatures of the mixed and preheated acetic acid and mixed butanol are increased after entering an esterification reactor and are reacted under catalysis of acid catalyst, a reaction product is performed initial gross separation in an esterification column in azeotrope form after being heated, a part of aqueous phase is performed reflux to the esterification column after a distillate at the top of the esterification column is performed condensation and phase separation, another part of the aqueous phase is discharged to a recovery column, a part of oil phase is performed reflux, and another part of the oil phase enters a rectification column as rough product to be further refined; and the rough product enters the rectification column from the middle of the same after being heated, a part of water and light components are removed by a membrane separator after a distillate at the top of the rectification column is condensed, a large part of the material reflows to the rectification column, a small part of the material is extracted to be reacted in the esterification reactor, and high-purity acetic acid mixed butyl ester is obtained at the bottom of the rectification column. Continuous production is achieved, and processes of neutralization, sedimentation and dehydration are omitted.

Description

technical field [0001] The invention relates to a production method for preparing mixed butyl acetate through continuous reactive distillation. Specifically, mixed butanol and acetic acid are used as raw materials to prepare mixed butyl acetate through continuous reactive distillation under the catalysis of an acid catalyst. Background technique [0002] Mixed butyl acetate is a colorless, flammable, commonly used organic solvent with a fruity aroma. Its main uses are as follows: (1) as a spice; (2) as a solvent, mixed butyl acetate has good solubility to many substances, and it can be used as a solvent for the manufacture of nitrocellulose paint, acrylic paint, polyurethane paint, etc. , These paints can be used as aircraft wing coatings, artificial leather coatings, automotive coatings, etc., mixed butyl acetate can also be used in the manufacture of celluloid products, coated paper, patent leather, etc.; (3) can be used as drug absorption promotion components; (4) As a r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/14C07C67/08
Inventor 赵楚榜于冬娥朱宏文何文晖吴长彩
Owner 谦信化工集团有限公司
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