渗透汽化脱除碳酸二甲酯中微量水的研究  

Dehydration of low water content in dimethyl carbonate by pervaporation

作　　者：肖通虎[1] 曹义鸣[1] 邓麦村[1] 张瑞丰[2] 

机构地区：[1]中国科学院大连化学物理研究所 [2]宁波大学材化学院,浙江宁波315211

出　　处：《天津工业大学学报》2008年第3期36-39,共4页Journal of Tiangong University

基　　金：国家973计划资助项目:(2003CB615703);浙江省自然科学基金(Y407353)

摘　　要：针对碳酸二甲酯(DMC)用于锂离子电池电解液溶剂时脱除DMC中微量水分的需要,对渗透汽化分离过程中的不同操作条件及膜分离性能下DMC中水能达到的极限最低含量进行了理论估算,并通过改进的热力学关系式判断膜是否适合于该分离过程.度进一步采用壳聚糖膜对渗透汽化脱除DMC中微量水进行了实验探索,理论预测可以较好地解释实验现象.结果表明,在实验操作条件渗透侧压力50 Pa且操作温度60℃时,壳聚糖膜难以将DMC中的水脱除到规定要求的20 mg/kg以下.It is necessary to reduce the water content for dimethyl carbonate （DMC） as a solvent of electrolyte solutions for Li-ion batteries. Dehydration of low water content in DMC was studied by pervaporation. A possible minimum value of water in DMC was estimated under different operation conditions. Thermodynamic prediction relation was developed to judge whether membrane was suitable or not. Furthermore, a chitosan membrane was used for dehydration of DMC by pervaporation. The prediction relation could explain the experimental results. The chitosan membrane was difficult to reduce the water content to lower than 20 mg/kg for DMC when the pressure on the membrane downstream side was 50 Pa and the operating temperature was 60 ℃.

关 键 词：渗透汽化 脱水 碳酸二甲酯 壳聚糖 

分 类 号：TS102.528.1[轻工技术与工程—纺织工程] TQ028.8[轻工技术与工程—纺织科学与工程]