基于离子液体的丁二烯抽提新工艺的研究.pdfVIP

基于离子液体的丁二烯抽提新工艺的研究 1 1 1 1 1* 2 曾少娟 ，田肖 ，张香平 ，赵立冬 ，张锁江 孙保德 （1. 中国科学院过程工程研究所 绿色过程与工程重点实验室 北京 100190 ； 2. 中国石化北京燕山石化公司 合成橡胶事业部 北京 102503 ） 摘要：提出以离子液体为第三组分的丁二烯抽提新工艺，通过考察不同种类的离子液体和咪 唑类离子液体的阴、阳离子对C4组份在复合萃取剂中的相对挥发度的影响，优选出适用于乙 腈法抽提丁二烯工艺的离子液体添加剂。研究了离子液体在工业条件下对C4组分相对挥发度 的影响，并对改进前后的两个工艺进行全流程模拟计算。结果表明：与现有乙腈法溶液体系 相比，离子液体有利于提高C4在新型复合萃取剂的相对挥发度，具有良好的萃取效果和分离 能力。含离子液体的新工艺相对现有工艺可降低能耗 20%左右。基于离子液体的乙腈法抽 提丁二烯新技术具有良好的工业应用前景。 关键词：离子液体；C4 ；乙腈法；相对挥发度 Research on new separation process of C mixture with ionic 4 liquid as additive 1 1 1 1 1* Shaojuan Zeng , Xiangping Zhang , Xiao Tian , Lidong Zhao , Suojiang Zhang , Baode Sun2 （1. Key Laboratory of Green Process Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; 2. Synthetic Rubber Business Division, Beijing Yanshan Petrochemical Company, SINOPEC, Beijing 102503, China） Abstract: A new separation process of C mixture with ionic liquid as additive is proposed in this 4 work. The influence of different kinds of ionic liquids and the anion and cation of ionic liquids on the relative volatility of C4 mixtures in acetonitrile (ACN) solvent system has been investigated. Based on the results, the appropriate ionic liquid additive for ACN extraction butadiene process has been designed and synthesized. Two flowsheets with or without ionic liquid additive have been simulated. The results show that ionic liquids have been proved to be an effective additive for C4 separation. T