| 摘要 |
The object of the present invention is to provide a specific process for production of a dialkyl carbonate and diol in industrial scale and, that is of 2 tons or more per hour dialkyl carbonate and 1.3 tons or more per hour of diol, respectively, with high selectivities and high yields for a long period in a reaction distillation plant, using a cyclic carbonate and a monohydric aliphatic alcohol as raw materials, in which the raw materials are fed continuously into a continuous multi-stage distillation column containing a catalyst to achieve both the reaction and the distillation simultaneously in the column. Although various process for production of a dialkyl carbonate and a diol by a reaction distillation method have been proposed, these are all relate to the production at a laboratory level (i.e., a small scale and a short production period). There has been no disclosure about a process or apparatus for the industrial-scale mass production of a dialkyl carbonate and a diol. Thus, disclosed is a process for production of a dialkyl carbonate and a diol which is characterized in that: a continuous multi-stage distillation column is used which has such a specific constitution that the dialkyl carbonate and the diol can be produced stably for a period of 1000 hours or longer, preferably 3000 hours or longer, more preferably 5000 hours or longer, in an industrial scale of 2 tons or more per hour and 1.3 tons or more per hour, respectively; according to the process raw materials are fed into a specific stage of the distillation column; and a monohydric aliphatic alcohol having a specific composition is used as a raw material. As a result, the object of the invention is easily achieved. |
