摘要
在101.32 kPa下,用改进的Othmer釜测定了乙醇-水-1,3-二甲基咪唑磷酸二甲酯盐([MMIM]+[DMP]-)物系等压气液平衡数据。实验结果表明,加入[MMIM]+[DMP]-使气液平衡线偏离乙醇-水二组分物系的气液平衡线,[MMIM]+[DMP]-含量越高,偏离程度越大;[MMIM]+[DMP]-表现出盐效应,使乙醇对水的挥发度发生改变,消除了乙醇-水物系的共沸点;并以[MMIM]+[DMP]-作为乙醇-水物系萃取精馏的溶剂,进行了萃取精馏的小型工艺试验,结果塔顶乙醇质量分数达到99.5%,能够满足工业要求。
Isobaric vapor-liquid equilibrium data for ethanol-water-[ MMIM ]^＋ [ DMP]^- ternary systems were measured at 101.32 kPa using modified Othmer still. The experimental results indicate that the vapor-liquid equilibrium curves of the ethanol-water-ionic liquid （IL） systems deviate from that of the IL-free system and the deviation increases with increasing amounts of IL. The ionic liquid shows a salt-out effect, which increases the relative volatility of ethanol to water,and even leads to an elimination of the azeotropic point. [ MMIM] ^＋ [ DMP]^- can be used as the solvent of ethanol-water system for extractive distillation. The small extractive distillation process test was carried out as well. The purity of ethanol at top of the tower reaches 99. 5% ,which can meet the requirement of industry.
出处
《现代化工》
CAS
CSCD
北大核心
2012年第2期69-73,共5页
Modern Chemical Industry
关键词
乙醇
水
1
3-二甲基咪唑磷酸二甲酯盐
气液相平衡
萃取精馏
ethanol
water
1,3-dimethylimidazolium dimethyl phosphate
vapor-liquid equilibrium
extractivedistillation
