离子液体萃取剂辅助分离甲醇-乙腈共沸物的研究  

Ionic liquid extractant assisted separation of methanol-acetonitrile azeotrope

作　　者：韩英娜 董雅叻 李文秀 李丽 张弢 HAN Ying-na;DONG Ya-le;LI Wen-xiu;LI Li;ZHANG Tao(Liaoning Provincial Key Laboratory of Chemical Separation Technology,Shenyang University of Chemical Technology,Shenyang 110142,China)

机构地区：[1]沈阳化工大学,辽宁省化工分离技术重点实验室,辽宁沈阳110142

出　　处：《现代化工》2025年第2期109-115,共7页Modern Chemical Industry

基　　金：国家自然科学基金资助项目(22278272)。

摘　　要：为实现甲醇-乙腈共沸体系的高效分离,以离子液体1-己基-3-甲基-咪唑双[(三氟甲基)磺酰基]亚胺盐([HMIM][NTF_(2)])为萃取剂,探究甲醇-乙腈-[HMIM][NTF_(2)]三元物系在101.325 kPa下的等压气液相平衡(VLE)行为。结果表明,当[HMIM][NTF_(2)]的摩尔分数为0.0395时,体系不再共沸,甲醇和乙腈得到有效分离;同时,离子液体摩尔分数的增加可提高甲醇相对于乙腈的相对挥发度。通过NRTL模型进一步验证实验结果的准确性;此外,利用过量焓、高斯和Aspen Plus对分离机理过程进行了分析。In order to achieve efficient separation of methanol-acetonitrile azeotrope system,1-hexyl-3-methyl-imidazole bis[(trifluoromethyl)sulfonyl]([HMIM][NTF_(2)])ionic liquid is used as extractant.The isobaric vapor-liquid equilibrium behavior of methanol-acetonitrile-[HMIM][NTF_(2)]ternary system at 101.325 kPa is studied.Experimental results show that azeotrope no longer appears and methanol effectively separates from acetonitrile when the molar fraction of[HMIM][NTF_(2)]is 0.0395.Meanwhile,the volatility of methanol relative to acetonitrile increases with the increase of ionic liquid dosage.The accuracy of the experimental results is further verified through NRTL model.In addition,excess enthalpy,Gaussian and Aspen Plus are utilized to analyze the separation mechanism.

关 键 词：气液平衡 甲醇 乙腈 离子液体 NRTL Aspen Plus 

分 类 号：TQ028[化学工程]