基于离子液体支撑液膜的苯/环己烷体系分离研究

Separation of benzene/cyclohexane system based on ionic liquid supported liquid membrane

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.