Concentration of ionic liquids by nanofiltration for recycling: Filtration behavior and modeling

Concentration of ionic liquids by nanofiltration for recycling: Filtration behavior and modeling
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通过纳滤浓缩离子液体以进行回收:过滤行为和建模

DOI:
10.1016/j.seppur.2016.03.042
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发表时间:
2016-06
影响因子:
8.6
通讯作者:
Yinhua Wan
Yinhua Wan
中科院分区:
工程技术1区
文献类型:
--
作者:
Junfeng Wang;Jianquan Luo;Xiangping Zhang;Yinhua Wan

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研究纳滤膜对离子液体(IL)浓度的过滤行为,对从天然聚合物和原料生物质溶解得到的溶液中回收离子液体具有重要意义。首先,采用终端过滤池对1-烯丙基-3-甲基咪唑氯([AMIM]Cl) - H2O、1-丁基-3-甲基咪唑氯([BMIM]Cl) - H2O和1-丁基-3-甲基咪唑四氟硼酸盐([BMIM]BF4) - H2O二元体系在6.64 ~ 132.74 L m−2h−1通量范围内的跨膜压力进行了测试。然后,根据文献中IL中阴离子和正离子的半径,采用溶液-扩散输运模型计算IL的渗透通量。在渗透通量为53.10 L m−2h−1时,NF270对[BMIM]Cl IL的截留率为96%左右,NF90对[BMIM]Cl IL的截留率低于NF90。在两种膜中,[BMIM]Cl的保留率均高于[BMIM] bf4,尽管[BMIM] bf4的半径略大。最后,在最佳实验参数下,[BMIM]Cl- h2o二元体系中的[BMIM]Cl可浓缩至约20%重量% (wt%)。这些都将为NF技术在IL- h2o体系中的应用提供必要的基础数据。
The study of filtration behavior in the concentration of ionic liquids (ILs) using nanofiltration (NF) membranes is of significance to recycle IL from the solution obtained by the dissolution of natural polymer and raw biomass. Firstly, the transmembrane pressure for the binary 1-allyl-3-methylimidazolium chloride ([AMIM]Cl) - H2O, 1-butyl-3-methylimidazolium chloride ([BMIM]Cl) - H2O and 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM]BF4) - H2O systems over the flux range from 6.64 to 132.74 L m−2h−1was examined using the dead-end filtration cell. Then, the solution-diffusion transport model was used to calculate the permeate flux of IL on the basis of radii of anion and cation in IL taken from literature. The real IL retention with NF270 was lower than that with NF90 which attained around 96% for [BMIM]Cl IL at a permeate flux of 53.10 L m−2h−1. For the two membranes, the retention of [BMIM]Cl was higher than that of [BMIM]BF4even if the radius of [BMIM]BF4was slightly larger. Finally, under the optimal experimental parameters, [BMIM]Cl in the binary system of [BMIM]Cl-H2O can be concentrated to approximately 20 weight percent (wt%). All of these will provide necessary fundamental data for the application of NF technology to concentrate IL in the IL-H2O system.
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