丁二烯抽提工艺中离子液体添加剂的筛选及分离性能  

Selection and separation performance of ionic liquid as additive in butadiene extraction with ACN

作　　者：曾少娟[1,2] 田肖[1] 董海峰[1] 张香平[1] 张锁江[3] 

机构地区：[1]中国科学院过程工程研究所,多相复杂系统国家重点实验室,离子液体清洁过程北京市重点实验室,北京100190 [2]中国科学院大学,北京100049 [3]中国科学院过程工程研究所,相复杂系统国家重点实验室,离子液体清洁过程北京市重点实验室,北京100190

出　　处：《化工学报》2014年第6期2120-2129,共10页CIESC Journal

基　　金：国家自然科学基金项目(U1162105);国家重点基础研究发展计划项目(2013CB733506)~~

摘　　要：提出以离子液体为第三组分的丁二烯抽提新工艺,通过考察不同结构的离子液体对C4组分在复合萃取剂中相对挥发度的影响,并结合量化计算的方法,研究了该工艺中萃取剂和第三组分与C4组分的相互作用机理,从而优选出适用于该工艺的离子液体添加剂[Emim][PF6]。另外研究了该离子液体在工业条件下对C4组分分离性能的影响,并对改进前后的工艺进行全流程模拟计算。结果表明:与现有乙腈法相比,离子液体的加入有利于提高C4在新型萃取剂中的相对挥发度,具有很好的分离效果。含离子液体的新工艺可使能耗降低约6.62%,乙腈消耗量降低约24%,而且离子液体能够回收利用,回收率高达98%(质量分数)以上,因此基于离子液体的乙腈法抽提丁二烯新技术具有很好的工业应用前景。A new separation process of C4 mixture with ionic liquid as additive was proposed. The influence of ionic liquid on the relative volatility of C4 mixtures in acetonitrile （ACN） solvent system was investigated. The interaction mechanisms between ACN, ionic liquid and C4 were analyzed by quantum chemistry calculations. In addition, two flowsheets of ACN butadiene extraction process with or without ionic liquid were simulated. Ionic liquids were proved to be effective additives for C4 separation, and the appropriate ionic liquid [Emim][PF6] for ACN butadiene extraction process was chosen and confirmed by the simulation results. In the practical process, the mixed solvent of ACN with ionic liquids showed better separation performance than that of ACN solvent, and the new technology could recover more than 98%（mass） ionic liquids after the distillation process. Moreover, separating C4 with ionic liquid could decrease energy consumption by about 24%. Therefore, the proposed new process technology with ionic liquid as additive is a perspective C4 mixture separation process.

关 键 词：离子液体 C4 乙腈法 相对挥发度 分离 丁二烯 

分 类 号：TQ028[化学工程]