Dimethyl maleate

Dimethyl maleate is an important organic chemical raw material used as plasticizer, preservative of fatty oil and raw material of organic synthesis. Dimethyl maleate is used in various catalytic hydrogenation processes to produce 1,4-Butanediol, oxolane, γ-butyrolactone, dimethyl succinate, etc. , 4-butanediol and dimethyl succinate can continue to be used to produce fully biodegradable plastic Polybutylene succinate (PBS) . The mixture gas containing maleic anhydride after initial cooling by heat exchange enters the bottom of the absorption tower and contacts with dimethyl maleate sprayed on the top of the tower countercurrent to obtain the absorption liquid. The esterification column was filled with solid acid esterification catalyst packing, and the absorption liquid was pumped from the top of the esterification column into the methanol vapor contact Chemicalbook reaction with the bottom of the esterification column, and the crude dimethyl maleate was obtained from the bottom of the column, the dimethyl maleate product is obtained by distillation and partially returned for spray absorption of maleic anhydride. Methanol and water were separated by steam distillation with water at the top of the column, and methanol was returned for esterification. The mixed gas containing maleic anhydride after primary cooling by heat exchange has a temperature of 130 ° C-170 ° C and a maleic anhydride content of 0.4 mol%-0.7 mol% . The solid acid esterification catalyst comprises a solid acid esterification catalyst which is one of 732 strong acid Ion-exchange resin, D001 large pore strong acid Ion-exchange resin and HZSM-5 molecular sieve. The esterification reaction conditions are as follows: temperature 50 ° C ~ 90 ° C, residence time 2H ~ 6h.

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Hebei Mojin Biotechnology Co., Ltd, Our company is a professional in 4'-Methylacetophenone,Levamisole hydrochloride ,N-Methylformamide and other chemical reagents research and development production enterprises. Our business covers more than 30 countries, most of the big customers come from Europe, America and other countries in the world, we can guarantee the quality and price. In recent decades, with the efforts of all employees, we have established many cooperative companies in shandong, henan, guangdong and other places. Our corporate purpose is based on the market, enhance the strength, take the road of scientific and environmental sustainable development, relying on the country. Technology r & d center, increase the investment in r & d, based on the domestic market, expand the international market, manufacturing quality products, sincere service to the society, into a modern, ecological, scientific and technological enterprise world.

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