Production process of glycine

A technology for the production of aminoacetic acid, applied in the field of aminoacetic acid production technology, can solve the problems of increased consumption of sulfur and acetic acid raw materials, increased relative load of the concentration section, and large output of ammonium chloride solution, so as to save steam energy Low energy consumption, low raw material consumption and fast speed

Pending Publication Date: 2022-06-28
闫三朋
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AI Technical Summary

Problems solved by technology

Due to the low concentration of hydrochloric acid solution and the large water volume, the water volume of the mother liquor increases, which increases the rectification load and consumes steam, which in turn causes a large amount of ammonium chloride solution to be recovered, which increases the relative load of the concentration section and increases the water volume of the evaporation effect.
[0004] The current process does not remove S, CI 2 equipment, so that there is no recovery of sulfuryl chloride, resulting in increased consumption of sulfur and acetic acid raw materials

Method used

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  • Production process of glycine
  • Production process of glycine
  • Production process of glycine

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Embodiment Construction

[0035] The technical solution of the present patent will be described in further detail below in conjunction with specific embodiments.

[0036] Depend on figure 2 As can be seen, the present invention comprises the following steps:

[0037] (1) Add acetic acid and chlorine gas into the chlorination reactor to react to generate chloroacetic acid and generate tail gas;

[0038] (2) The chloroacetic acid obtained by the reaction in step (1), ammonia gas and hexamethylenetetramine are added to the ammoniation reactor for reaction to generate an ammoniated solution, and the ammoniated solution is added to a methanol alcohol precipitation kettle for extraction with methanol solution, and the extraction is completed. Then carry out centrifugation to obtain glycine product and methanol mother liquor;

[0039] (3) The tail gas produced in the step (1) enters the cooler for cooling, so that the acetic acid and acetyl chloride in the tail gas are condensed and recycled for the chlori...

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Abstract

The invention discloses a production process of glycine, and belongs to the technical field of glycine production. Comprising the following steps: (1) adding acetic acid and chlorine into a chlorination reactor to react to generate chloroacetic acid and generate tail gas; (2) adding chloroacetic acid into an ammoniation reactor for reaction to generate ammoniation liquid, and purifying to obtain a glycine product and methanol mother liquor; (3) enabling the tail gas generated in the step (1) to pass through a cooler, so that acetic acid and acetyl chloride in the tail gas are condensed and recycled for chlorination reaction; (4) the uncondensed tail gas enters a desulfurization and dechlorination device to generate sulfuryl chloride, and the sulfuryl chloride is condensed and reused for chlorination reaction; meanwhile, recovering hydrogen chloride gas; and (5) the hydrogen chloride gas enters a hydrochloric acid absorption device to prepare a hydrochloric acid solution, and the hydrogen chloride gas which is not absorbed is mixed with the methanol mother liquor for neutralization reaction. The method has the characteristics of safety, reliability, energy conservation, emission reduction, low consumption of sulfur and acetic acid raw materials, high product quality and the like.

Description

technical field [0001] The present invention relates to the present invention relates to the technical field of glycine production, in particular to a production process of glycine. Background technique [0002] At present, domestic industrial aminoacetic acid is generally equipped with chloroacetic acid production equipment. The chloroacetic acid product is produced by acetic acid, liquid chlorine and sulfur as a catalyst, and reacts at a certain temperature to generate chloroacetic acid. At the same time, it produces mainly hydrogen chloride gas, a small amount of chlorine gas, sulfur dioxide and sulfur trioxide. The formed tail gas is recovered to obtain a hydrochloric acid solution. Glycolic acid process uses chlorination method to produce chloroacetic acid as raw material. Chloroacetic acid is aminated with ammonia gas and hexamethylenetetramine at low temperature to generate aminoacetic acid reaction solution. The ammoniated reaction solution is crystallized by droppin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C227/08C01B17/45C01B7/07C01B7/01C01C1/16C07C229/08
CPCC07C227/08C01B17/4592C01B7/01C01B7/0725C01C1/164C07C229/08
Inventor 闫三朋张军贤
Owner 闫三朋
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