Technology for producing high-purity aminoacetic acid based on urotropine cyclic utilization technology

Abstract

The invention belongs to the technical field of aminoacetic acid production, and provides a technology for producing high-purity aminoacetic acid based on an urotropine cyclic utilization technology. The technology comprises the following steps: 1) adding chloroacetic acid and urotropine to a dissolving kettle, adding methanol for dissolving the materials at the temperature of 38-42 DEG C; 2) moving the materials into a reaction vessel, slowly introducing ammonia gas, wherein the temperature is 38-42 DEG C, when a pH value is 7, stopping introduction of the ammonia gas, heating the materials to the temperature of 58-62 DEG C, insulating the materials for 20 minutes; 3) continuously introducing the ammonia gas and cooling the materials to the temperature of 25 DEG C, separating solid and liquid; 4) adding a solid mixture to a secondary dissolving kettle, heating the mixture to the temperature of 75 DEG C, introducing the mixture into a crystallization kettle, wherein, the temperature is 25 DEG C, adding methanol for crystallization, stirring the materials for 2 hours, and precipitating amino acetic acid crystal; and 5) separating the amino acetic acid crystal by a centrifuge, and drying a solid to obtain the amino acetic acid. According to the invention, problems of appropriate crystallization temperature for producing the amino acetic acid, uncompleted reaction, low yield, low purity, easy fouling and obstruction, unstable technical index control, and easy fluctuation generation of product quality and yield can be solved.

Description

technical field [0001] The invention belongs to the technical field of aminoacetic acid production, and relates to a production process for producing high-purity aminoacetic acid based on urotropine recycling technology. Background technique [0002] Glycine, also known as glycine, is an important fine chemical intermediate, widely used in chemical industry, pesticide, medicine, food and feed and other fields, especially since the advent of the global herbicide glyphosate, glycine has played an important role in the pesticide industry The application is increasing rapidly, and the global demand has exceeded 300,000 tons / year. There are many synthetic process routes of aminoacetic acid, and the production routes that have been industrialized and have industrialization prospects are only chloroacetic acid ammonolysis method, Streck method, radiation synthesis method and biosynthesis method. [0003] The ammonolysis method of chloroacetic acid is mainly prepared by using urotr...

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Problems solved by technology

[0004] The present invention proposes a production process for producing high-purity aminoacetic acid based on urotropine recycling technology, which solves the problem of unsuitable crystallization temperature, insufficient reaction, low yield and high purity in the production of aminoacetic acid by ammonolysis of chloroacetic acid in the prior art. Poor, the equipment is prone to fouling and clogging, the process index control is unstable, and the product quality and yield are prone to fluctuations in technical problems

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