Method for producing high-purity diphenyl carbonate on an industrial scale

摘要

The problem to be solved by the present invention is that industrially large amounts of high-purity diphenyl carbonate required for producing high-quality and high-performance aromatic polycarbonates from cyclic carbonate and phenol (for example, 1 ton or more per hour) ) For a long period of time (for example, 1000 hours or longer, preferably 3000 hours or longer, more preferably 5000 hours or longer). A process for producing dialkyl carbonates and diols using a reactive distillation column with a specific structure to produce high-purity diphenyl carbonate required for producing high-quality and high-performance aromatic polycarbonate from cyclic carbonate and phenol (I) Step (II) for producing diphenyl carbonate using two reactive distillation towers having a specific structure, and using this high-boiling substance separation tower A and diphenyl carbonate purification tower B, The said subject can be achieved by implementing the method of this invention including process (III) to acquire.