Patent ID: 8058465
Filing Date: 2011-11-15
Classification: B01D,C07C,Y02P

Abstract:
1. A process for industrially producing a dialkyl carbonate and a diol in which the dialkyl carbonate and the diol are continuously produced through a reactive distillation system of taking a cyclic carbonate and an aliphatic monohydric alcohol as starting materials, comprising the steps of: continuously feeding the starting materials into a continuous multi-stage distillation column in which a catalyst is present; carrying out reaction and distillation simultaneously in said column; continuously withdrawing a low boiling point reaction mixture containing the produced dialkyl carbonate from an upper portion of the column in a gaseous form; and continuously withdrawing a high boiling point reaction mixture containing the diol from a lower portion of the column in a liquid form, wherein (a) said continuous multi-stage distillation column comprises a structure having a cylindrical trunk portion having a length L (cm) and an inside diameter D (cm) and having thereinside an internal with a number of stages n, and comprises a gas outlet having an inside diameter d (1) the length L (cm) satisfies the formula (1); (2) the inside diameter D (cm) of the column satisfies the formula (2); (3) a ratio of the length L (cm) to the inside diameter D (cm) of the column satisfies the formula (3); (4) the number of stages n satisfies the formula (4); (5) a ratio of the inside diameter D (cm) of the column to the inside diameter d (6) a ratio of the inside diameter D (cm) of the column to the inside diameter d