Solvent process for synthesizing cartap

Abstract

The present invention discloses a solvent process for synthesizing cartap, comprising that a monosultap alkaline aqueous solution and sodium cyanide undergo a cyanation reaction in a halohydrocarbon solvent and at a temperature of between 20 DEG C below zero and 80 DEG C to give an intermediate thiocyanide solution; and then, the intermediate thiocyanide solution together with methanol and hydrochloric acid gas undergoes a hydrolysis reaction at a temperature of between 50 DEG C below zero and 100 DEG C, for 2 to 30 hours, to give a crude product of the cartap. The method solves the problems in the production of complex process, serious three wastes, instable product yield and instable quality, etc. The method can be suitable for large-scale industrialized and commercialized production.

Description

technical field [0001] The invention belongs to the field of pesticides, in particular to a preparation method of cartap. Background technique [0002] Cartap is an insecticide derived from nereistoxin, which is more efficient and has a wider spectrum than the previous domestically produced pesticides such as dimehypo, monosultap, and cyclosultap. In the early 1980s, some people tried to In my country's current situation, using the existing equipment and technology of insecticide manufacturers, dimehypo is used as raw material to produce cartap through cyanidation and hydrolysis reactions, but due to the complex composition and many impurities of dimehypo, resulting in cyanidation The reaction yield is high, the quality is poor, and the project investment is large, the operation is complicated, the three wastes are serious, and it cannot be industrialized on a large scale. In the 1990s, some people used aromatic hydrocarbons as solvents and monosultap as raw materials to prod...

AI Technical Summary

Problems solved by technology

[0002] Cartap is an insecticide derived from nereistoxin, which is more efficient and has a wider spectrum than the previous domestically produced pesticides such as dimehypo, monosultap, and cyclosultap. In the early 1980s, some people tried to In my country's current situation, using the existing equipment and technology of insecticide manufacturers, dimehypo is used as raw material to produce cartap through cyanidation and hydrolysis reactions, but due to the complex composition and many impurities of dimehypo, resulting in cyanidation The reaction yield is high, the quality is poor, and the project investment is large, the operation is complicated, the three wastes are serious, and it is impossible to carry out large-scale industrial production

In the 1990s, some people used aromatic hydrocarbons as solvents and monosultap as raw materials to produce cartap through cyanidation and hydrolysis reactions. Some breakthroughs were made, and industrial production was initially realized. However, due to the use of aromatic hydrocarbon solvents, cyanidation, The hydrolysis reaction is difficult to control, the operational flexibility is small, and it is difficult to achieve stable production yield. In addition, due to the unreasonable recovery process of aromatic solvents, there are more three wastes, difficult treatment and high cost.