Trimethyl phosphite producing process

Abstract

The trimethyl phosphite producing process with the materials including methanol, phosphorus trichloride, xylene and N, N-dimethyl aniline includes the steps of introducing ammonia to produce synthesis reaction, water washing, laminating, drying and distilling. The present invention has sealed operation, one-step distillation, circular use of the residual liquid and the tail gas after treatment, etc. Trimethyl phosphite is used as important material for medicine, pesticide intermediate, plastic and many other materials.

Description

technical field

[0001] The invention relates to a method for preparing trimethyl phosphite by using phosphorus trichloride and methanol as main raw materials. Background technique

[0002] Enyl phosphate insecticides are widely used in agriculture and forestry in my country, and have good insecticidal effects. Trimethyl phosphite is in great demand as the main raw material of enyl phosphate insecticides, and it is also used in the manufacture of plastics and wood industries. Plasticizers, flame retardants and stabilizers also have good development and application prospects. At present, phosphorus trichloride and methanol are used as the main raw materials at home and abroad, and organic amines or tertiary amines are mostly used as acid-binding agents to synthesize trimethyl phosphite, and then ammonia gas is introduced to decompose the acid-binding agent. After the synthesis reaction The mixed material is filtered, washed and distilled to obtain the product. Since suction f...