基于离子液体支撑液膜的苯/环己烷体系分离研究
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摘要
以往通过萃取精馏法实现苯/环己烷的体系分离,没有考虑膜液的流失问题,损失量及物料循环量均较高,耗能较大.提出基于离子液体支撑液膜的苯/环己烷体系分离方法,使用离子液体"充填型"支撑液膜,进行苯/环己烷的体系分离实验,分析了不同离子液体、不同操作温度、不同孔状结构的聚偏二氟乙烯超滤膜和原料侧苯蒸汽压等对分离性能的影响.结果显示,对聚偏氟乙烯支撑液膜离子液体填充后,渗透通量明显提高,分离因子也成倍增长.实验结果可以有效说明,离子液体支撑液膜的分离过程可以作为苯/环己烷体系分离的高效方法.
In the past, the separation of benzene and cyclohexane was realized by extraction distillation without considering the loss of membrane liquid, the loss and circulation of materials were higher, and the energy consumption was higher. The separation method of benzene/cyclohexane system based on ionic liquid supporting liquid membrane was put forward. The separation experiment of benzene/cyclohexane system was carried out by using ionic liquid "filling" supporting liquid membrane, and the separation of benzene and cyclohexane was carried out in different ionic liquids at different operating temperatures. The effects of polyvinylidene fluoride ultrafiltration membrane with different pore structure and benzene vapor pressure on the separation performance were analyzed. The experimental results show that when the ionic liquid is filled, the permeation flux is obviously increased and the separation factor is doubled. The experimental results can effectively explain the separation process of liquid membrane supported by ionic liquids and can be used as an efficient separation method for benzene/cyclohexane system.
In the past, the separation of benzene and cyclohexane was realized by extraction distillation without considering the loss of membrane liquid, the loss and circulation of materials were higher, and the energy consumption was higher. The separation method of benzene/cyclohexane system based on ionic liquid supporting liquid membrane was put forward. The separation experiment of benzene/cyclohexane system was carried out by using ionic liquid "filling" supporting liquid membrane, and the separation of benzene and cyclohexane was carried out in different ionic liquids at different operating temperatures. The effects of polyvinylidene fluoride ultrafiltration membrane with different pore structure and benzene vapor pressure on the separation performance were analyzed. The experimental results show that when the ionic liquid is filled, the permeation flux is obviously increased and the separation factor is doubled. The experimental results can effectively explain the separation process of liquid membrane supported by ionic liquids and can be used as an efficient separation method for benzene/cyclohexane system.
引文
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[15] 刘晓亭,孙晓岩,夏力,等.原油常减压蒸馏装置仿真培训系统设计[J].计算机仿真,2016,33(12):244-248.
[2] 翟建,刘育良,李鲁闽,等.萃取精馏分离苯/环己烷共沸体系模拟与优化[J].化工学报,2015,66(9):3570-3579.
[3] 刘福瑞,崔野,崔海清,等.离子液体分离膜及其在CO2分离的应用研究进展[J].应用化工,2017,46(9):1787-1791.
[4] 李剑,彭黔荣,李阳阳,等.离子液体支撑液膜蒸汽渗透和气体分离的研究进展[J].化工新型材料,2017,45(7):15-17.
[5] 白璐,张香平,邓靓,等.离子液体膜材料分离二氧化碳的研究进展[J].化工学报,2016,67(1):248-257.
[6] 黄禹,王克良,李静,等.以二甘醇为萃取剂萃取精馏分离苯-环己烷共沸体系[J].山东化工,2017,46(7):29-32.
[7] 曾昭容,丁立,彭勇,等.用于芳烃/烷烃体系蒸汽渗透分离的离子液体支撑液膜研究[J].高校化学工程学报,2009,23(5):762-767.
[8] 张良,胡飞付,杨伍,等.苯 - 环己烷共沸体系物性方法与萃取剂的筛选[J].科技广场,2017,(3):115-117.
[9] Martins M A R,Coutinho J A P,Pinho S P,et al.Measurements of activity coefficients at infinite dilution of organic solutes and water on polar imidazolium-based ionic liquids[J].J China Academy Electron Information Technol,2015,91(3):194-203.
[10] 姚路路,叶辉,宋影,等.水性聚氨酯膜渗透蒸发分离苯/环己烷的条件及过程[J].化工学报,2016,67(s1):289-295.
[11] 宋影,姚路路,王泽,等.水性聚氨酯膜的制备及渗透汽化分离苯/环己烷[J].高分子材料科学与工程,2015,31(12):21-26.
[12] Gonfa G,Bustam M A,Muhammad N,et al.Effect of task specific thiocyanate based ionic liquids on relative volatility of cyclohexane and benzene azeotropic mixture[J].J Power Supply,2017,238(8):208-214.
[13] 顾玲,孙晓利,任冬红,等.离子液体/苯并15 - 冠 - 5浸渍XAD - 7树脂萃取分离锂同位素[J].核化学与放射化学,2015,37(6):415-424.
[14] 韩东敏,陈艳红.分隔壁塔萃取精馏分离环己烷 - 苯共沸物的模拟优化[J].炼油技术与工程,2017,47(2):55-59.
[15] 刘晓亭,孙晓岩,夏力,等.原油常减压蒸馏装置仿真培训系统设计[J].计算机仿真,2016,33(12):244-248.