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Coupling production process for preparing methyl acetate and butyl acetate

A technology of methyl acetate and butyl acetate, which is applied in the field of coupling production process for the preparation of methyl acetate and butyl acetate, can solve the problems of high energy consumption and material consumption, azeotropic carry-over, etc., to improve production efficiency and reduce heating The effect of reducing product energy consumption

Active Publication Date: 2014-06-04
JINJIANG TAIXING CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] (1) Since the water generated in the methyl acetate esterification reaction cannot be taken away azeotropically with methyl acetate, there will be a large amount of water remaining in the system, and a large amount of methyl ester must be replenished through the top reflux to carry water, and energy consumption high material consumption
[0017] (2) In the esterification reaction of butyl acetate, since the butyl acetate produced cannot be taken away azeotropically with water, a large amount of butyl acetate will remain in the system, and a large amount of water must be replenished through the top reflux to carry out the esterification. High consumption and material consumption

Method used

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  • Coupling production process for preparing methyl acetate and butyl acetate
  • Coupling production process for preparing methyl acetate and butyl acetate
  • Coupling production process for preparing methyl acetate and butyl acetate

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Such as figure 1 As shown, the raw material methanol and acetic acid enter the methyl acetate reboiler 1 at a molar ratio of 1:1.6, and the feed rate is 1800L / h. After mixing and preheating, they enter the methyl acetate esterification reactor 2 for esterification reaction. The product enters the methyl acetate esterification tower 3 in the form of an azeotrope, and then enters the methyl acetate overhead condenser 4 and the methyl acetate phase separator 5 for processing and then enters the rectifying tower. Methyl acetate is esterified at 95°C in the bottom of the tower, 68°C in the tower, and 56.3°C at the top of the tower, and the acid in the still is controlled at 65%~66%. Simultaneously extract a part of the still liquid and enter the flash tower 6 for processing, the flow of extracting the still liquid is 645L / h, and the low boiler methyl acetate and water are steamed from the top of the flash tower, which is connected to the plug behind the methyl acetate reboil...

Embodiment 2

[0033] Such as figure 1As shown, the raw material methanol and acetic acid enter the methyl acetate reboiler 1 at a molar ratio of 1:1.7, and the feed rate is 2000L / h. After mixing and preheating, they enter the methyl acetate esterification reactor 2, and then further heat up for reaction. The reaction product enters the methyl acetate esterification tower 3 in the form of an azeotrope, and then enters the methyl acetate overhead condenser 4 and the methyl acetate phase separator 5 for processing and then enters the rectifying tower. Methyl acetate is esterified at 98°C in the bottom of the tower, 70°C in the tower, and 56.5°C at the top of the tower, and the acid in the still is controlled at 70%~71%. Simultaneously extract a part of the still liquid and enter the flash tower 6 for processing. The flow of extracting the still liquid is 750L / h. The temperature of the tube and the bottom of the tower is controlled at 106°C~108°C, and the temperature at the top of the tower is...

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Abstract

The invention discloses a coupling production process for preparing methyl acetate and butyl acetate, which comprises a methyl acetate reaction section, a flash zone and a butyl acetate esterification reaction distillation working section, wherein in the methyl acetate reaction section, acetic acid and methanol are introduced into a methyl esterification kettle for an esterification reaction, and after the reaction, a part of esterification kettle liquid is extracted to enter the flash zone for separation; distilled materials from the top of a flash tower are methyl acetate and a small amount of water, and are introduced into an inserting tube at the back of a methyl reboiler, and an extracted material at the bottom of the flash tower is a mixed material of acetic acid containing or non-containing a small amount of methyl acetate; and the mixed material and the raw material butanol are heated and introduced into a butyl acetate esterification kettle for a butyl acetate esterification reaction. Thereby the coupling production of methyl acetate and butyl acetate is realized, the methyl esterification reaction is enhanced, and the energy consumption of products is reduced.

Description

technical field [0001] The present invention relates to the coupled production process of methyl acetate and butyl acetate in the field of chemical industry, specifically, its technical process comprises methyl acetate esterification reaction rectification section, flash section and butyl acetate esterification reaction rectification section. In the present invention, the acetic acid rich in water after reactive distillation in the methyl acetate esterification kettle is used for the reactive distillation of butyl acetate, so as to realize the coupled production of methyl acetate and butyl acetate, and achieve the purpose of strengthening the esterification reaction of methyl acetate, The purpose of reducing product energy consumption. Background technique [0002] Methyl acetate is a class of excellent solvents, miscible with alcohols, ethers, hydrocarbons, etc. It is an excellent solvent for cellulose esters, urea resins, etc. It is used as a quick-drying solvent for nitr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C69/14C07C67/08
Inventor 赵楚榜朱宏文叶四华汪尚飞张浩宁
Owner JINJIANG TAIXING CHEM IND CO LTD
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