分子筛循环脱水合成碳酸亚乙烯酯工艺研究

Synthesis of Vinylidene Carbonate by Circulating Dehydration Process with Molecular Sieve

以一氯碳酸乙烯酯和碳酸氢钠为原料,采用分子筛循环脱水工艺合成碳酸亚乙烯酯。优化合成工艺条件后,碳酸亚乙烯酯收率为81.24%,气相色谱法测定含量约为96%。该合成工艺与传统工艺相比,无三乙胺盐酸盐副产物,无需压滤,溶剂用量少;副产物CO_(2)、NaCl和H_(2)O可分别通过放空、沉降和分子筛吸附脱除;并且,外循环吸附脱水工艺,不受溶剂沸点限制,粗反应液组分少、收率高、易分离、能耗低。

Vinylene carbonate was synthesized using vinyl chloride carbonate and sodium bicarbonate as raw materials by a molecular sieve circulating dehydration process.After optimizing the synthesis process conditions,the purity of vinylene carbonate reached up about 96%by the analysis method of gas chromatography,and its purity yield is 81.24%.Compared with traditional processes,this synthesis process has no by-products of triethylamine hydrochloride,no need for pressure filtration,and less solvent usage;The byproducts CO_(2),NaCl,and H_(2)O could be removed through venting,sedimentation,and molecular sieve adsorption,respectively.Moreover,the external circulation adsorption dehydration process was not limited by the solvent boiling point,had fewer components in the crude reaction solution,high yield,easy separation,and low energy consumption.