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Method and system for preparing trifluoroacetic acid by hydrolyzing trifluoroacetyl chloride

A technology of trifluoroacetyl chloride and trifluoroacetic acid is applied in the preparation of acyl halide, separation/purification of carboxylic acid compounds, organic chemistry and other directions, which can solve the problems of high production cost, small production capacity, low hydrolysis efficiency, etc., and achieve energy saving , The effect of reducing equipment investment and improving hydrolysis efficiency

Inactive Publication Date: 2020-10-13
ZIBO FEIYUAN CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of low hydrolysis efficiency, high production cost and low production capacity in the process of hydrolyzing trifluoroacetyl chloride to produce trifluoroacetic acid, the present invention provides a method that can improve the hydrolysis efficiency of trifluoroacetyl chloride, reduce production cost and is suitable for large-scale industrial production. Methods and systems for trifluoroacetic acid

Method used

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  • Method and system for preparing trifluoroacetic acid by hydrolyzing trifluoroacetyl chloride
  • Method and system for preparing trifluoroacetic acid by hydrolyzing trifluoroacetyl chloride

Examples

Experimental program
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Effect test

Embodiment 1

[0052] 1325kg / h of trifluoroacetyl chloride enters from the bottom of the packed hydrolysis tower, and 190kg / h of 5% trifluoroacetic acid aqueous solution is preheated to 30°C and then enters from the top of the packed hydrolysis tower, both of which are carried out in the packed hydrolysis tower Fully contacted, the hydrogen chloride gas produced by the hydrolysis reaction is discharged from the top of the packed hydrolysis tower, and the crude trifluoroacetic acid produced by the hydrolysis reaction enters the rectification tower 5 for distillation and purification. The temperature at the top of rectification tower 5 is 70°C to 90°C, and the pure product of trifluoroacetic acid with a purity >99.5% is obtained at the top of rectification tower 5, and the temperature at the bottom of rectification tower 5 is 100°C to 120°C, and the bottom of rectification tower 5 is obtained The azeotrope of trifluoroacetic acid and water enters the pervaporation membrane water removal device ...

Embodiment 2

[0054] 1325kg / h of trifluoroacetyl chloride enters from the bottom of the packed hydrolysis tower, and 380kg / h of 5% trifluoroacetic acid aqueous solution is preheated to 50°C and then enters from the top of the packed hydrolysis tower, both of which are carried out in the packed hydrolysis tower Full contact, the hydrogen chloride gas produced by the hydrolysis reaction is discharged from the top of the packed hydrolysis tower, and the crude trifluoroacetic acid produced by the hydrolysis reaction enters the rectification tower 5 for distillation and purification. Pure trifluoroacetic acid with a purity >99.5% is obtained at the top, the temperature at the bottom of rectification tower 5 is 100°C to 120°C, and the azeotrope of trifluoroacetic acid and water obtained at the bottom of rectification tower 5 enters the pervaporation membrane water removal device 6 , the pervaporation membrane removes the moisture in the azeotrope of trifluoroacetic acid and water to obtain pure tr...

Embodiment 3

[0056] 1325kg / h of trifluoroacetyl chloride enters from the bottom of the plate hydrolysis tower, and 380kg / h of 5% trifluoroacetic acid aqueous solution is preheated to 60°C and enters from the top of the plate hydrolysis tower. The two are carried out in the plate hydrolysis tower Fully contact, the hydrogen chloride gas produced by the hydrolysis reaction is discharged from the top of the plate hydrolysis tower, and the crude product of trifluoroacetic acid enters the rectification tower 5 for distillation and purification. >99.5% pure trifluoroacetic acid, the temperature at the bottom of the rectification tower 5 is 100°C to 120°C, and the azeotrope of trifluoroacetic acid and water obtained at the bottom of the rectification tower 5 enters the pervaporation membrane water removal device 6 for pervaporation The membrane removes the moisture in the azeotrope of trifluoroacetic acid and water to obtain pure trifluoroacetic acid with a purity >99.5%, and the yield of trifluor...

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Abstract

The invention provides a method for preparing trifluoroacetic acid by hydrolyzing trifluoroacetyl chloride. A packed tower or a plate tower is used as a hydrolysis tower to hydrolyze trifluoroacetyl chloride, the contact area between gas and liquid is increased, the hydrolysis efficiency is improved, the production cost of equipment investment and the like is reduced, and large-scale production can be realized, so that the problems of low hydrolysis efficiency, high production cost and low productivity of the existing process for producing trifluoroacetic acid by hydrolyzing trifluoroacetyl chloride are solved. An azeotrope of trifluoroacetic acid and water is separated by adopting a pervaporation membrane, and alkali washing and acidification processes are replaced, so that the energy issaved, and the environmental risk and the production cost are reduced. The invention further provides a system for preparing trifluoroacetic acid by hydrolyzing trifluoroacetyl chloride.

Description

technical field [0001] The invention relates to the technical field of fluorine chemical industry, in particular to a method and system for preparing trifluoroacetic acid by hydrolysis of trifluoroacetyl chloride. Background technique [0002] Trifluoroacetic acid is an important fluorine-containing intermediate, which contains a special structure of trifluoromethyl group, and can participate in various organic synthesis reactions, making it have excellent performance, especially for the synthesis of fluorine-containing medicines, pesticides and dyes, etc. In the field of fluorine-containing fine chemicals, the demand at home and abroad is increasing, and it has become one of the important intermediates of fluorine-containing fine chemicals. [0003] About the preparation method and the system of trifluoroacetic acid, prior art report has: (1) gaseous trifluoroacetyl chloride is passed into reactor, and the method that hydrolysis generates trifluoroacetic acid and hydrogench...

Claims

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Application Information

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IPC IPC(8): C07C53/18C07C51/04C07C51/44C07C51/43
CPCC07C51/04C07C51/43C07C51/44C07C53/18
Inventor 蔡连国窦志群苗佩利高攀金帅于艳美段飞飞
Owner ZIBO FEIYUAN CHEM CO LTD
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