The Recycled Process Of Methychloride From The By-Product Of Glyphosate

This article is on the process development of recovering MeCl, a byproduct during the manufacturing of glyphosate, as a result of the study on the optimization of glyphosate synthesis process.There are many synthesis methods of glyphosate. In China, the mostly used process is the alkylphosphite route, which will produce large amount of residual gas. After laboratory research and pilot production, we are successful in separating MeCl of commercial value. As a result, we have designed an advanced recovering process which is very successful for commercial production.In the laboratory research, we find the composition of residual gas as 60-70% of MeCl, 25% of air , 1-5% of MeOH, 2-8% of dimethoxymethane, 4% of HCl and small amount of water,, dimethylether , EtCl , CO2 and etc.The pilot research is aimed at the separation of impurities such as MeOH, dimethoxymethane, HCl and water. After separation, we obtain MeCl with more than 99.5% purity. We can recover 610kg of MeCl per ton of glyphosate, which is the foundation for recovering on commercial scale.The recovering process includes washing with water, washing with alkaline and drying, Automatic feed of air is used to stabilize air supply and keep the reaction condition of glyphosate unchanged.We use this process in a 30kt/a glyphosate facility and obtain MeCl with purity of more than 99.5% and water of 50PPM and a yield of 95%. We use the recovered MeCl for the synthesis of methylchlorosilane(MCS) and find the quality up to standard. With this process, we also make the production of glyphosate in a moreclean way.