Salt transport in polymeric pervaporation membrane

doi:10.1016/j.cjche.2019.11.009

Chinese Journal of Chemical Engineering ›› 2020, Vol. 28 ›› Issue (3): 758-765.DOI: 10.1016/j.cjche.2019.11.009

• Separation Science and Engineering • Previous Articles Next Articles

Salt transport in polymeric pervaporation membrane

Dihua Wu^1,2, Aoran Gao², Xianshe Feng²

1 College of Materials and Environmental Engineering, Hangzhou Dianzi University, Xiasha Higher Education Zone, Hangzhou 310018, China;
2 Department of Chemical Engineering, University of Waterloo, 200 University Avenue West, Waterloo N2L 3G1, Ontario, Canada

Received:2019-06-24 Revised:2019-11-07 Online:2020-06-11 Published:2020-03-28
Contact: Xianshe Feng
Supported by:
Research support from the Natural Sciences and Engineering Research Council (NSERC) of Canada and Zhejiang Province Natural Science Foundation of China (LQ20B060002) are gratefully acknowledged. We also wish to acknowledge Arkema Inc. for generously supplying the polymer used in making the membranes.

Salt transport in polymeric pervaporation membrane

Dihua Wu^1,2, Aoran Gao², Xianshe Feng²

1 College of Materials and Environmental Engineering, Hangzhou Dianzi University, Xiasha Higher Education Zone, Hangzhou 310018, China;
2 Department of Chemical Engineering, University of Waterloo, 200 University Avenue West, Waterloo N2L 3G1, Ontario, Canada

通讯作者: Xianshe Feng
基金资助:
Research support from the Natural Sciences and Engineering Research Council (NSERC) of Canada and Zhejiang Province Natural Science Foundation of China (LQ20B060002) are gratefully acknowledged. We also wish to acknowledge Arkema Inc. for generously supplying the polymer used in making the membranes.

Abstract

Abstract: The salt transport in a PEBA membrane used in pervaporative desalination was studied. The concentration profile of salt in the membrane during pervaporation was investigated experimentally using a multilayer membrane. The salt was found to be sorbed in the membrane but was not removed during the pervaporative desalination process, and the salt concentration in the membrane varied linearly with position. High purity water was obtained as the permeate as long as the permeate side was kept dry under vacuum. The accumulated salt uptake in the membrane follows the order of MgCl₂ > NaCl > Na₂SO₄. The solubility of salt in the membrane follows the order of MgCl₂ > NaCl > Na₂SO₄. Both the permeability and diffusivity of salt in the membrane follow the order of NaCl > MgCl₂ > Na₂SO₄. The permeability of salt in the membrane is not influenced by the feed salt concentration. It is mainly determined by the diffusion coefficients.

Key words: Concentration profile, Pervaporative desalination, Salt transport

摘要： The salt transport in a PEBA membrane used in pervaporative desalination was studied. The concentration profile of salt in the membrane during pervaporation was investigated experimentally using a multilayer membrane. The salt was found to be sorbed in the membrane but was not removed during the pervaporative desalination process, and the salt concentration in the membrane varied linearly with position. High purity water was obtained as the permeate as long as the permeate side was kept dry under vacuum. The accumulated salt uptake in the membrane follows the order of MgCl₂ > NaCl > Na₂SO₄. The solubility of salt in the membrane follows the order of MgCl₂ > NaCl > Na₂SO₄. Both the permeability and diffusivity of salt in the membrane follow the order of NaCl > MgCl₂ > Na₂SO₄. The permeability of salt in the membrane is not influenced by the feed salt concentration. It is mainly determined by the diffusion coefficients.

关键词: Concentration profile, Pervaporative desalination, Salt transport

Dihua Wu, Aoran Gao, Xianshe Feng. Salt transport in polymeric pervaporation membrane[J]. Chinese Journal of Chemical Engineering, 2020, 28(3): 758-765.

Dihua Wu, Aoran Gao, Xianshe Feng. Salt transport in polymeric pervaporation membrane[J]. 中国化学工程学报, 2020, 28(3): 758-765.

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Salt transport in polymeric pervaporation membrane

Salt transport in polymeric pervaporation membrane

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