利用膜脱水回收离子液体的研究

Study on Ionic Liquid and Water Separation by Membrane

利用膜反应器对比在不同的工况下反渗透膜和渗透气化膜脱水回收[Emim][OAc]离子液体的效果。结果表明,反渗透膜对于低浓度离子液体具有较高的截留效果,而随着离子液体浓度的增加,透过反渗透膜离子液体的浓度增加,脱水效果变差,并且渗透量也从原来浓度为2%(wt)的[Emim][OAc]的9kg/(m^2·h)降低到了8%(wt)时的1.69kg/(m^2·h)。渗透气化膜在温度为100℃、流速为10 mL/min条件下,内循环62小时,通量从最开始的0.434 kg/(m^2·h)到0.302 kg/(m^2·h),保持略微下降的趋势,而离子液体的浓度从初始的20%(wt)上升到50%(wt)。表明了利用渗透气化膜对于IL-H_2O脱水的可行性。对IL离子液体的脱水回收具有一定的指导意义。

The effects of reverse osmosis membrane and pervaporation membrane dehydration and recovery[Emim][OAc]were compared under different working conditions by using a membrane reactor.The results showed that the reverse osmosis membrane had a high retention effect for low-concentration ionic liquid,and the dehydration effect became worse with the increase of ionic liquid concentration through the reverse osmosis membrane,and the permeability decreased from9kg/(m^2·h)of[Emim][OAc]at a concentration of2%(wt)to1.69kg/(m^2·h)at8%(wt).The pervaporation membrane was internally circulated for62hours at a temperature of100℃and a flow rate of10ml/min,flux from the beginning of0.434kg/(m^2·h)to0.302kg/(m^2·h),remained slightly downward trend,and the concentration of the ionic liquids can be increased from the original20%(wt)to50%(wt).It shows the feasibility of using pervaporation membrane for IL-H2O dehydration,which will be of some guiding significance for the recovery of IL.