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Method for preparing chloracetic acid using acetyl chloride as catalyst

A technology of acetyl chloride and catalyst, applied in the field of chloroacetic acid production, can solve the problems of insignificant economic effect, poor quality of by-produced hydrochloric acid, serious environmental pollution, etc., achieve significant economic and social benefits, improve product purity, and reduce dichloride Effect of acetic acid content

Inactive Publication Date: 2009-03-18
邯郸市大用空分设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Sulfur-catalyzed production of chloroacetic acid has low product purity, poor quality by-produced hydrochloric acid, and serious environmental pollution
The acetic anhydride catalytic method produces chloroacetic acid, although the product quality is good and the third-degree pollution is small, but the investment is large, the cost is high, and the economic effect is not significant

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A certain amount of acetic acid, 10% chloroacetyl, 1% concentrated sulfuric acid and 0.1% FeCl are charged into the reactor 3 , into the chlorination reaction. The condenser tube was cooled by -30°C ammonia. After the reaction, analyze the content of chloroacetic acid and dichloroacetic acid in the chlorination liquid and the content of acetyl chloride, chloroacetyl chloride, acetic acid, chloroacetic acid, and dichloroacetyl in the condensate. The analysis results: the chlorination reaction is 8 hours, and the content of chloroacetic acid reaches 88%. , and the content of chloroacetic acid reached 93% in 12h of chlorination reaction.

[0014] The condensate consists of:

[0015] Acetyl chloride Chloroacetyl chloride Acetic acid, chloroacetic acid, dichloroacetic acid, sulfuric acid, etc.

[0016] 35% 5% 60%.

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Abstract

The present invention discloses a method for preparing a chloroactic acid with acetyl chloride as a catalyst. The production of acetyl chloride by the acetic acid chlorination process can be largely improved by adopting an acetyl chloride strong acid catalyst. By using the method, the reaction speed is improved, the reaction time is shortened, the purity of the product is improved, the content of dichloro acetic acid is reduced, the yield is improved and the cost is reduced. Meanwhile, the pollution is largely alleviated, the by-product hydrochloric acid meets the standard of synthetic hydrochloric acid, and the method is expected to create significant economic benefits and social benefits.

Description

technical field [0001] The invention relates to a method for producing chloroacetic acid by using acetyl chloride as a catalyst, belonging to the field of chemical industry. Background technique [0002] At present, acetic acid chlorination is used to produce chloroacetic acid, most of which use sulfur catalysis, and only a few manufacturers use acetic anhydride catalysis. It is known from the reaction mechanism that no matter which catalytic method is used, the real catalyst is acetyl chloride. Sulfur and acetic anhydride are nothing but initiators of acetyl chloride formation, and they are added only to shorten the induction period of acetyl chloride formation. And the whole chlorination reaction is controlled by enolization of acetyl chloride. Strong acid can catalyze the enolization of acetyl chloride, and the strong acid catalyst of acetyl chloride is a better catalyst for the chlorination of acetic acid. Sulfur-catalyzed production of chloroacetic acid has low produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C53/16B01J31/04B01J27/128
Inventor 张天德
Owner 邯郸市大用空分设备有限公司
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