Production process of glycine

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...

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

Images