Methyl carbamate refining method

Abstract

According to the methyl carbamate refining method, methyl carbamate is subjected to recrystallization separation and vacuum drying treatment through methylbenzene under nitrogen protection, ethyl carbamate is separated out, and a refined methyl carbamate product is obtained. The methyl carbamate is recrystallized and purified for multiple times by adopting methylbenzene, so that the ethyl carbamate in the methyl carbamate is separated out, the impurity of the ethyl carbamate is reduced to a level which cannot be detected, and the method has the advantages of reasonable process, convenience in operation and high purity.

Description

technical field

[0001] The invention relates to the technical field of organic synthesis intermediate processing, in particular to a method for purifying methyl carbamate. Background technique

[0002] Methyl carbamate is an important organic synthesis intermediate, which can be used as an organic synthesis intermediate in medicine, pesticide and other industries. It has the characteristics of low toxicity, strong poisoning specificity, easy to be degraded by various factors, low residue, and small side effects on the environment, so it has become a new type of insecticide, herbicide, and mosquito and fly control in the world in recent years. agent, and its application field is expanding rapidly. Methyl carbamate products in the existing process contain trace amounts of urethane. Ethyl carbamate is a carcinogen that can cause lung tumors, lymphoma, liver cancer, skin cancer, etc. How to remove carbamate from methyl carbamate products? The separation of ethyl ester impuriti...