Cleaning production process of glycine

Abstract

The invention relates to a cleaning production process of glycine. According to the method, a mixed solution of glycine and ammonium chloride is produced on the basis of a chloroacetic acid ammonolysis method and glycine and ammonium chloride are separated by an electroosmosis method. The cleaning production process has the following advantages: 1, based on the traditional chloroacetic acid ammonolysis, the electroosmosis technology is carried out without chemical reaction or addition of any raw material, so the prepared product is good in quality and high in yield; 2, no byproduct is generated, no three wastes pollution is caused, the situation that a large quantity of wastewater rich in chlorine formaldehyde is generated in the traditional process can be avoided; and 3, diluted liquid and concentrated liquid can be recycled in the electroosmosis process, thereby saving the production cost of glycine.

Description

technical field [0001] The invention relates to a preparation process of a chemical product glycine, in particular to a clean production process of glycine. Background technique [0002] Glycine (Gly) is an amino acid with the simplest structure in the amino acid series and not necessary for the human body. It has both acidic and basic functional groups in the molecule. It is a strong electrolyte in aqueous solution and has a large solubility in strong polar solvents. It is insoluble in non-polar solvents, and has a relatively high boiling point and melting point. Glycine can exhibit different molecular forms by adjusting the acidity and alkalinity of the aqueous solution. Among them, the industrial grade glycine is mainly used as a pesticide intermediate and the main raw material of the herbicide glyphosate. At present, the technologies for industrialized production of glycine mainly include chloroacetic acid ammonolysis method, Streck method (cstercker method), hydrogen c...

AI Technical Summary

Problems solved by technology

The disadvantage is that the reaction time is long, the by-product ammonium chloride and other inorganic salts are difficult to remove, the product quality is poor, and the refining cost is high; at the same time, the process produces a large amount of waste water rich in inorganic salts (ammonium chloride) and formaldehyde. The cost of environmental protection treatment is relatively high, and urotropine as a catalyst is difficult to recycle and reuse, resulting in a great waste of raw materials and increasing production costs

One ton of product discharges three tons of wastewater that seriously exceeds the national discharge standard. Although there are methods for treating wastewater with patented technologies such as patent 200510069080.7 and patent 200510117616.8, this obviously increases the process and cost of the process

For example, the research on the synthesis process of glycine by ammonolysis of chloroacetic acid (from "Chemical Industry and Engineering Technology", Volume 31, No. 6) has further studied the ammonolysis of chloroacetic acid, although the process efficiency has been further improved. However, it is still necessary to add a large amount of methanol to remove alcohol to precipitate glycine, and the yield of glycine can only be said to be greater than 79%, and the purity can only be said to be greater than 90%.

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