Process for producing glycine byproduct ammonium chloride

Abstract

The invention provides a process for producing glycine byproduct ammonium chloride. The process comprises the following steps: by taking a chloroacetic acid solution as a raw material, carrying out an ammonolysis reaction with ammonia through catalysis of urotropine; performing negative pressure condensation on the reaction solution, cooling and crystallizing to obtain a mixture of glycine and ammonium chloride; and performing gradient cooling on the mixture so as to obtain glycine and high-purity ammonium chloride, and recycling the mother solution. According to the process disclosed by the invention, continuous production of glycine is realized, the production efficiency is improved, the labor intensity is reduced, the equipment input is reduced, and the catalyst, urotropine, can be recycled in the reaction by adopting the recycling process for the alcohol-phase reactive mother solution. Moreover, the ammonium chloride is separated by adopting the concentrating, cooling and crystallizing process, the usage amount of methanol is reduced, the energy consumption is reduced, and residual liquor is avoided.

Description

technical field [0001] The invention belongs to the technical field of chemical production and relates to a production process for co-producing ethyl ammonium chloride from glycine. Background technique [0002] Glycine is an important raw material for products such as glyphosate and glycine ethyl ester hydrochloride, and it can also be refined into food-grade glycine for use. The existing glycine production technology is to produce a mixture of glycine and ammonium chloride through catalyzed ammonium decomposition of chloroacetic acid in the water phase. The mixture solution is separated by methanol alcohol analysis to obtain the finished product of glycine, and the separated mother liquor is obtained by rectification to obtain 92% The methanol is continued to be used for alcohol analysis, and the rectification raffinate is distilled to obtain industrial grade ammonium chloride. [0003] The prior art mainly has the following defects: 1. the prior art is a batch reaction, ...

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Problems solved by technology

[0003] The prior art mainly has the following defects: 1. the prior art is a batch reaction, and the investment in equipment is large, the labor intensity is high, and the production efficiency is low

②The alcohol analysis process will use a large amount of methanol, and methanol recovery requires a lot of energy consumption

③ Catalyst urotropine cannot be recycled, resulting in waste of raw materials

④ The existing process will produce a large amount of residual liquid that cannot be handled

⑤A large amount of wall sticking phenomenon will appear on the contact surface of alcohol phase reaction cooling, which seriously affects the cooling of the system

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