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Dimethyl carbonate (DMC) is a rapidly developing environmental harmony green chemical product. It can be used as a basic organic chemical material to replace phosgene, chloromethane, methyl chloroformate and other toxic substances. It is of great significance for environmental protection.In addition, it has been widely used in the production of high-performance resins, solvents, dye intermediates, drugs, flavoring agents, food preservatives and other fields, so dimethyl carbonate is considered as a "new cornerstone" of organic synthesis and has broad prospects for development.
Synthesis of Dimethyl Carbonate by Transesterification
The synthesis of dimethyl carbonate by transesterification of propylene carbonate with methanol is a reversible reaction. Reactive distillation technology is used to promote the reaction and improve the yield of dimethyl carbonate. Reactive distillation integrates reaction and distillation separation, removes reaction products in time, shifts equilibrium to product direction, and maximizes the conversion of raw materials. Sodium methanol as catalyst has strong catalytic activity and high selectivity. It overcomes the drawbacks of low yield of dimethyl carbonate in traditional process, improves the output of products and reduces energy consumption.
Dimethyl Carbonate Replacement
Methyl 2,4-toluene dicarbamate was synthesized from dimethyl carbonate instead of phosgene and then decomposed into toluene diisocyanate. The reaction conditions were mild, the catalyst was cheap, and methanol was the only by-product. If combined with methanol oxidation carbonylation of dimethyl carbonate, it can form a "zero emission" green synthesis process, which is an important development direction of clean chemical industry.
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