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In recent years, China has carried out extensive research and development on dialkyl carbonates, especially the development of dimethyl carbonate is quite extensive, but it is generally based on alkali metal hydroxides, alkaline earth metal carbonates, alkali metal alcohols. Salt is a catalyst. These catalysts are homogeneous catalysts and need to be separated and recovered. When the catalysts are separated, the co-produced alkanediols are affected by alkaline catalysts at high temperatures to remove water, directly affecting the yield and economy of the product.
The patented technology developed by the Research Institute of Jilin Petrochemical Company adopts a special method to stir the clay and metal carbonate with distilled water, and prepare the solid mixed catalyst by granulation, roasting, etc., and use carbonic acid ester and alcohol as The raw materials are catalytically distilled to produce dialkyl carbonates.
Dialkyl carbonate catalyst obtained patent for invention
The solid catalyst and its application for dialkyl carbonate developed by Jilin Petrochemical Research Institute have recently won the national invention patent. The solid catalyst provided by the patented technology has high activity and life, can be continuously operated for more than 1000 hours, the conversion rate of the ene carbonate is more than 80%, and the yield of dialkyl carbonate is more than 75%. Compared with the traditional process, this patented technology shortens the process flow and solves the engineering problems of separating catalysts, making continuous reaction possible.