关键词: 碳酸二甲酯,    , 酯交换,    , 反应精馏塔,    , 塔盘液位高度,    , 回流比

Abstract: Dimethyl carbonate(DMC)was prepared by transesterification of propylene carbonate and methanol with sodium methoxide as catalyst.Based on the traditional process,transformation of floate valve tray was made.The pilot test was carried on the novel reactive distillation column.Effects of tray liquid height,reflux ratio on the product purity were studied.The result shows that the dimethyl carbonate content improved and became stable with the reflux ratio increased;with the tray liquid height increases,the dimethyl carbonate content increased and gradually stable;propylene glycol content decreased as the reflux ratio increased.When the reflux ratio was 0,tray liquid height was 5.2 cm,the content of product can reach 26% or so,content of propylene glycol was less than 0.5%.Comparison of new and traditional process energy consumption was made.The result shows that the new process can save 0.46 t of standard coal per ton of products.

Key words: Dimethyl carbonate,    , Transesterification,    , Reactive distillation column,    , Tray liquid height,    , Reflux ratio