Improvement of HI concentration performance for hydrogen production iodine–sulfur process using crosslinked cation-exchange membrane

Tanaka, Nobuyuki; Sawada, Sumiyuki; Yamaki, Tetsuya; Kodaira, Takehide; Kimura, Takehiro; Nomura, Mikihiro

doi:10.1016/j.ces.2021.116575

Cited by 3 publications

(1 citation statement)

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“…In recent years, cation-exchange membranes (CEMs) have received considerable attention from researchers and manufacturers, and have been widely used for various industrial purposes [ 1 ], such as the separation of metal ion pollutants from hard water [ 2 ], chlor-alkali electrolysis [ 3 ], fuel cells [ 4 , 5 , 6 , 7 , 8 , 9 ], electrodialytic concentration or desalination of electrolyte solutions [ 1 , 3 , 10 ], redox flow batteries [ 11 , 12 , 13 ], reverse electrodialysis [ 14 , 15 , 16 ], and hydrogen production [ 17 , 18 , 19 ]. CEMs contain fixed, negatively charged groups that allow cations to pass through the membranes while concurrently rejecting anions.…”

Section: Introductionmentioning

confidence: 99%

Ionic Transport Properties of Cation-Exchange Membranes Prepared from Poly(vinyl alcohol-b-sodium Styrene Sulfonate)

et al. 2021

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Membrane resistance and permselectivity for counter-ions have important roles in determining the performance of cation-exchange membranes (CEMs). In this study, PVA-based polyanions—poly(vinyl alcohol-b-sodium styrene sulfonate)—were synthesized, changing the molar percentages CCEG of the cation-exchange groups with respect to the vinyl alcohol groups. From the block copolymer, poly(vinyl alcohol) (PVA)-based CEMs, hereafter called “B-CEMs”, were prepared by crosslinking the PVA chains with glutaraldehyde (GA) solution at various GA concentrations CGA. The ionic transport properties of the B-CEMs were compared with those previously reported for the CEMs prepared using a random copolymer—poly(vinyl alcohol-co-2-acrylamido-2-methylpropane sulfonic acid)—hereafter called ”R-CEMs”. The B-CEMs had lower water content than the R-CEMs at equal molar percentages of the cation-exchange groups. The charge density of the B-CEMs increased as CCEG increased, and reached a maximum value, which increased with increasing CGA. A maximum charge density of 1.47 mol/dm3 was obtained for a B-CEM with CCEG = 2.9 mol% and CGA = 0.10 vol.%, indicating that the B-CEM had almost two-thirds of the permselectivity of a commercial CEM (CMX: ASTOM Corp. Japan). The dynamic transport number and membrane resistance of a B-CEM with CCEG = 8.3 mol% and CGA = 0.10 vol.% were 0.99 and 1.6 Ωcm2, respectively. The B-CEM showed higher dynamic transport numbers than those of the R-CEMs with similar membrane resistances.

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