Improved process for synthesizing omethoate

Abstract

The invention discloses an improved process for synthesizing omethoate. In the process of preparation of omethoate by using a post aminolysis method, coarse prepared omethoate crude oil is first dried, and then desolvation is conducted so as to obtain omethoate crude oil. Through improvement of multiple processes, improvement of the reaction environment, improvement of the progress of a main reaction and reduction of hydrolysis are achieved to the greatest extent, the reaction yield is improved, and the post-treatment of salt-containing compounds is more convenient. By using the process, the yield of refined ester of oxygen sulfur phosphorus ester can be increased to 86% or above, and the purity is also increased to 90% or above; the purity of ammonium chloride can reach 99% or above, andthe ammonium chloride can be directly sold as a by-product first-grade product; the total yield of the omethoate crude oil can be increased to 79% or above, the purity of the crude oil is also improved, the overall process is greatly improved, and the social and economic benefits are huge.

Description

technical field [0001] The invention relates to an improved process for synthesizing omethoate, which belongs to the technical field of organic compound synthesis. Background technique [0002] Organic synthesis is a common reaction, but due to the self-reaction of organic compound synthesis, some problems will appear in the process of organic synthesis. For example, there are many side reactions in the solid-liquid organic synthesis reaction, the most common of which is the generation of salt-containing by-products, and the occurrence of side reactions has more or less a certain impact on the main reaction, for example: affecting the main reaction The process affects the content, yield and so on of the main product. If the organic compound is hydrolyzed, the content and yield of the product will be adversely affected. [0003] Omethoate is a highly efficient systemic insecticide and acaricide, widely used in rice, cotton, fruit trees, wheat, sorghum, sugar cane and other ...

AI Technical Summary

Problems solved by technology

In the traditional process of this reaction, water needs to be added, and the reaction is carried out at 65°C. The entire process environment is particularly conducive to the dissolution of ammonium chloride in the crude ester system, thus resulting in a large amount of exothermic heat in the system, difficulties for employees to operate the temperature, and increased The progress of the side reaction increases the chance of meeting the main by-products to a greater extent and reduces the yield of this step

For example, Omethoate crude oil needs to be desolventized, and Omethoate will be hydrolyzed in the process, resulting in a reduction in the yield and content of Omethoate crude oil