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Production process for chloroacetic acid

A production process and technology of chloroacetic acid, which are applied in the preparation of carboxylate, the preparation of organic compounds, chemical instruments and methods, etc., can solve the problems of high consumption of raw materials, low yield and the like, and achieve low consumption, high yield of finished products, good quality effect

Inactive Publication Date: 2005-01-19
DONGFENG CHEM XINHUA MEDICINE GROUP ZIBO CITY SHANDONG PROV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem that this technology exists is, yield is low, and raw material consumption is high
However, the problem with these processes is that the mother liquor is treated as a waste product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 2400kg of acetic acid, 72kg of sulfur, 30kg of zinc chloride, and 400kg of mother liquor (refers to the amount added before the chlorination reaction).

[0015] Press acetic acid into the chlorination tank, add sulfur, chlorine inhibitor zinc chloride, and heat up the mother liquor. When the temperature rises to 70°C, the chlorine flow is increased, when the temperature reaches 80°C, the amount of chlorine flow is increased, and when the specific gravity of the material reaches 1.363 / 80°C, the chlorine flow is stopped to obtain a chlorinated semi-finished product. Put the chlorinated semi-finished product into the stirring tank and cool down slowly; when the material temperature reaches 56°C, crystallization begins to appear, and when the temperature drops to 51°C, it is difficult to stir the feed liquid. At ℃, the crystallized matter is put into a suction filter, and the mother liquor (for next use) is removed with a vacuum to obtain 3433kg of chloroacetic acid finishe...

Embodiment 2

[0023] 2400kg of acetic acid, 72kg of sulfur, 24kg of manganous chloride (also known as manganese chloride), 240kg of mother liquor (refers to the amount added before the chlorination reaction).

[0024] Press acetic acid into the chlorination tank, add sulfur, chlorine inhibitor manganous chloride, and heat up the mother liquor. When the temperature rises to 70°C, the chlorine flow is increased, when the temperature reaches 80°C, the amount of chlorine flow is increased, and when the specific gravity of the material reaches 1.365 / 80°C, the chlorine flow is stopped to obtain a chlorinated semi-finished product. Put the chlorinated semi-finished product into the stirring tank and cool down slowly; when the material temperature reaches 57°C, crystallization begins to appear, and when the temperature drops to 51°C, it is difficult to stir the feed liquid. At ℃, the crystallization is put into a suction filter, and the mother liquor (for next use) is removed with a vacuum to obtai...

Embodiment 3

[0032] Technology is with embodiment one. The catalyst is sulfur, and the chlorine inhibitor is manganese acetate. By weight, acetic acid: sulfur = 1: 0.025; acetic acid: manganese acetate = 1: 0.01; acetic acid: mother liquor = 1: 0.05.

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PUM

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Abstract

The invention discloses a process for preparing chloroacetic acid which comprises, conducting chlorination reaction to the chlorine and acetic acid at the presence of catalyst, adding mother liquid before the chlorination reaction, the weight ratio of acetic acid and mother liquid is 1:0.05-0.2, chlorine resisting agent can also be added before the chlorination reaction.

Description

technical field [0001] The invention relates to a production process of chloroacetic acid. Background technique [0002] Chloroacetic acid, also known as monochloroacetic acid, is mainly used as an intermediate of medicine, pesticide and dye. There are three kinds of production techniques of chloroacetic acid at present, and what the present invention relates to is the acetic acid chlorination method wherein. [0003] The process of producing chloroacetic acid by acetic acid chlorination method is as follows: put acetic acid and catalyst into the chlorination reaction tank, and start to pass chlorine when the temperature rises to 70°C. When the catalyst is sulfur, keep the temperature between 80-95°C. When it is acetic anhydride, keep the temperature between 90-105°C, stop the chlorine flow when the specific gravity of the material reaches 1.360-1.365 / 80°C, press the material into the crystallization tank, and suction filter and centrifuge af...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/363C07C53/16
Inventor 韩祥坤石晶王国亮任君王建华李建军
Owner DONGFENG CHEM XINHUA MEDICINE GROUP ZIBO CITY SHANDONG PROV
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