Modeling and simulation of continuous electrodialysis metathesis process for conversion of Na2SO4 to K2SO4

Wang, Xu; Du, Yawei; Liu, Jie; Xu, Fan; Ji, Zhiyong; Guo, Xiaofu; Li, Fēi; Yuan, Junsheng

doi:10.1016/j.desal.2022.115605

Cited by 10 publications

(3 citation statements)

References 31 publications

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“…Therefore, with increasing WU of the membranes, the t − values also increased for ions having a higher hydration energy. Therefore, with the incorporation of higher alkyl groups, the t Cl − /t SOd 4 2− value increases due to a greater decrease in the t − value for SO 4 2− compared to that for Cl − ion. Uncrosslinked membranes (Q18) show higher t − values for both Cl − and SO 4 2− ions, which results in a lower t Cl − /t SOd 4 2− than that of MQ18, presumably due to the easy transport of hydrated ions through the membrane with higher absorption of water in the matrix.…”

Section: Surface Morphology and Phase Separationmentioning

confidence: 98%

“…IEMs play a prominent role in ED due to their selectivity toward ions. IEMs are also used extensively in diffusion dialysis (DD) for acid recovery, , water desalination, metathesis electrodialysis, and fuel cell applications . The separation of monovalent anions from their mixture with multivalent anions present in an aqueous solution is essential to maintain product purity.…”

Section: Introductionmentioning

confidence: 99%

“…because the C18 chain may lead to steric hindrance for the transportation of sulfate ions, which enhanced the permselectivity (P SOd 4…”

mentioning

confidence: 99%

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Preparation of a Monovalent-Selective Anion-Exchange Membrane: Effect of Alkyl Chain Length and Crystallinity

Mondal

Sarkar

Patnaik

et al. 2023

ACS Appl. Polym. Mater.

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Crosslinked anion-exchange membranes (AEMs) with reasonable water uptake are used for the separation of monovalent anions from their mixture with bivalent anions by electrodialysis (ED). Herein, we report the preparation of a series of monovalent-selective crosslinked AEMs containing imidazole rings from the polyacrylonitrile-co-poly(vinylimidazole) (PAN-co-PVIm) copolymer (AN/VIm ratio = 75:25 mol/mol), followed by N-alkylation with alkyl halide of different chain lengths (carbon number: 1,6,10,18), followed by reaction with 1,6-diamino hexane. The difference in the obtained permselectivity (P SO4 2– Cl– ) was compared with those of un-crosslinked and commercial Ionsep membranes. The effects of crosslinking, the chain length of the alkyl spacer attached to imidazolium nitrogen of the membrane matrix, and the partial crystallinity occurring due to the arrangement of long alkyl chains on P SO4 2– Cl– were investigated. A representative crosslinked membrane (MQ18) with an octadecyl alkyl chain length (C18) attached to the imidazole moiety exhibited moderate water uptake (22%), high fixed charge density (0.037 meq/cm3), and high P SO4 2– Cl– (6.4) during the separation of a mixture of 0.01 M sodium chloride and 0.01 M sodium sulfate (2000 mg/L) by the ED process. The P SO4 2– Cl– value is further increased from 6.4 to 16.7 by increasing the electrolyte concentration to 0.05 M sodium chloride and 0.05 M sodium sulfate. The rigid imidazolium structure, locally organized higher chain length of the alkylating group, and the crosslinked network structure provide steric hindrance for the passage of more hydrophilic sulfate anions, which facilitates higher selectivity.

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Section: Surface Morphology and Phase Separationmentioning

confidence: 98%