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Separation and concentration of ionic liquid aqueous solution by vacuum membrane distillation
Wu, Huanhuan1,2; Shen, Fei1; Wang, Junfeng1; Luo, Jianquan1; Liu, Lixia1,2; Khan, Rashid1,2; Wan, Yinhua1
2016-11-15
发表期刊JOURNAL OF MEMBRANE SCIENCE
ISSN0376-7388
卷号518期号:NOV页码:216-228
摘要

Due to the high cost of ionic liquids (ILs), how to economically recycle them from aqueous solutions is one of the critical issues for their large-scale applications. In this work, vacuum membrane distillation (VMD) technique was proposed to separate and concentrate the 1-butyl-3-methylimidazolium chloride ([13mim]CI) aqueous solutions at high concentration (e.g. >= 20 wt%), where a polyacrylonitrile-based (PAN-based) hydrophobic membrane was prepared and used. The chemical resistance and VMD separation performance of the PAN-based membrane were estimated. The results showed that the homemade membrane possessed good chemical resistance to several kinds of media and favorable VMD flux and rejection. Four different groups of VMD concentration processes with intermittent operation mode were then carried out to separately concentrate a 20 wt% [Bmim]CI solution. The concentration process, membrane fouling and wetting, as well as cleaning strategy were compared and discussed. It was found that for the hydrophobic PAN-based membrane, surface hydrophilization resulted from surface chemistry rearrangement happened especially at high feed temperature, which might aggravate the adsorption of [Bmim]CI on membrane surface. Membrane top layer wetting would occur due to the synergistic effect of surface hydrophilization and deposition of [Bmim]CI, which not only induced the reductions of the membrane flux and rejection, but also further caused internal pore wetting. Therefore, the fouling mechanism during the VMD concentration might be divided into three stages, surface deposition, top layer wetting and internal pore wetting. Timely cleaning (i.e. before surface wetting) could effectively prevent the fouling deterioration (i.e. from surface deposition to surface wetting) and improve the VMD concentration process, resulting in a high flux recovery over 95%. Under the optimal conditions, a final [Bmim]CI concentration as high as 65.5 wt% with a total [Bmim]CI recovery over 99.5% was achieved, indicating that VMD was a promising candidate for concentrating ILs aqueous solutions. (C) 2016 Elsevier Ltd. All rights reserved.

关键词Ionic Liquid Membrane Distillation Concentration Fouling Wetting
文章类型Article
WOS标题词Science & Technology ; Technology ; Physical Sciences
DOI10.1016/j.memsci.2016.07.017
收录类别SCI
语种英语
关键词[WOS]LIGNOCELLULOSIC BIOMASS ; PLASMA POLYMERIZATION ; COMPOSITE MEMBRANES ; SURFACE DYNAMICS ; WATER ; RECOVERY ; TEMPERATURE ; ELECTRODIALYSIS ; NANOFILTRATION ; DISSOLUTION
WOS研究方向Engineering ; Polymer Science
WOS类目Engineering, Chemical ; Polymer Science
项目资助者Solar Energy Initiative of the Chinese Academy of Sciences(KGCX2-YW-380) ; National High-Tech R&D Program of China(2012AA021202 ; 2014AA021005)
WOS记录号WOS:000382254500022
引用统计
被引频次:11[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ipe.ac.cn/handle/122111/21439
专题生化工程国家重点实验室
作者单位1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Biochem Engn, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714
Wu, Huanhuan,Shen, Fei,Wang, Junfeng,et al. Separation and concentration of ionic liquid aqueous solution by vacuum membrane distillation[J]. JOURNAL OF MEMBRANE SCIENCE,2016,518(NOV):216-228.
APA Wu, Huanhuan.,Shen, Fei.,Wang, Junfeng.,Luo, Jianquan.,Liu, Lixia.,...&Wan, Yinhua.(2016).Separation and concentration of ionic liquid aqueous solution by vacuum membrane distillation.JOURNAL OF MEMBRANE SCIENCE,518(NOV),216-228.
MLA Wu, Huanhuan,et al."Separation and concentration of ionic liquid aqueous solution by vacuum membrane distillation".JOURNAL OF MEMBRANE SCIENCE 518.NOV(2016):216-228.
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