| 摘要 |
Disclosed is a process for ethylene carbonate production which comprises steps of reacting carbon dioxide with ethylene oxide in the presence of a catalyst to obtain a liquid reaction mixture that contains ethylene carbonate and purifying the generated ethylene carbonate by crystallization. In the process, a catalyst-containing liquid is withdrawn from the liquid reaction mixture, and water is added thereto in an amount at least 20 times by weight the amount of the catalyst dissolved in the withdrawn liquid. Insolubles are thereby precipitated. The precipitated insolubes are removed, and the residual liquid is circulated to the liquid reaction mixture. Thus, ethylene carbonate from which coloring matter has been removed can be efficiently produced. In addition, in a process for producing ethylene glycol, clogging is prevented and the system can be stably operated over a long period. |
