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 | |
刊名 | JOURNAL OF MEMBRANE SCIENCE
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2016-11-15 | |
卷号 | 518期号:NOV页码:216-228 |
关键词 | Ionic liquid Membrane distillation Concentration Fouling Wetting |
ISSN号 | 0376-7388 |
英文摘要 | 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. |
WOS标题词 | Science & Technology ; Technology ; Physical Sciences |
类目[WOS] | Engineering, Chemical ; Polymer Science |
研究领域[WOS] | Engineering ; Polymer Science |
关键词[WOS] | LIGNOCELLULOSIC BIOMASS ; PLASMA POLYMERIZATION ; COMPOSITE MEMBRANES ; SURFACE DYNAMICS ; WATER ; RECOVERY ; TEMPERATURE ; ELECTRODIALYSIS ; NANOFILTRATION ; DISSOLUTION |
收录类别 | SCI |
语种 | 英语 |
WOS记录号 | WOS:000382254500022 |
内容类型 | 期刊论文 |
源URL | [http://ir.ipe.ac.cn/handle/122111/21439] ![]() |
专题 | 过程工程研究所_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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