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  • Alkali recovery using PVA/SiO2 cation exchange membranes with different -COOH contents.

Alkali recovery using PVA/SiO2 cation exchange membranes with different -COOH contents.

Journal of hazardous materials (2012-12-29)
Jianwen Hao, Ming Gong, Yonghui Wu, Cuiming Wu, Jingyi Luo, Tongwen Xu
ABSTRACT

By changing -COOH content in poly(acrylic acid-co-methacryloxypropyl trimethoxy silane (poly(AA-co-γ-MPS)), a series of PVA/SiO(2) cation exchange membranes are prepared from sol-gel process of poly(AA-co-γ-MPS) in presence of poly(vinyl alcohol) (PVA). The membranes have the initial decomposition temperature (IDT) values of 236-274 °C. The tensile strength (TS) ranges from 17.4 MPa to 44.4 MPa. The dimensional stability in length (DS-length) is in the range of 10%-25%, and the DS-area is in the range of 21%-56% in 65 °C water. The water content (W(R)) ranges from 61.2% to 81.7%, the ion exchange capacity (IEC) ranges from 1.69 mmol/g to 1.90 mmol/g. Effects of -COOH content on diffusion dialysis (DD) performance also are investigated for their potential applications. The membranes are tested for recovering NaOH from the mixture of NaOH/Na(2)WO(4) at 25 - 45 °C. The dialysis coefficients of NaOH (U(OH)) are in the range of 0.006-0.032 m/h, which are higher than those of the previous membranes (U(OH): 0.0015 m/h, at 25 °C). The selectivity (S) can reach up to 36.2. The DD performances have been correlated with the membrane structure, especially the continuous arrangement of -COOH in poly(AA-co-γ-MPS) chain.

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Poly(vinyl alcohol), SAJ first grade, degree of polymerization 500
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Poly(vinyl alcohol), 87-90% hydrolyzed, average mol wt 30,000-70,000
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$66.30
$47.74
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$196.00
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100 mL
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$263.00
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$51.40
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$151.00
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$243.00
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Poly(vinyl alcohol), Mw 146,000-186,000, 99+% hydrolyzed
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$61.30
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$163.00
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$276.00
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Poly(vinyl alcohol), average Mw 31,000-50,000, 87-89% hydrolyzed
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$52.80
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$140.00
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$228.00
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$57.30
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$124.00
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$199.00
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$266.00
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Poly(vinyl alcohol), average Mw 146,000-186,000, 87-89% hydrolyzed
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$146.00
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$260.00
$236.60
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Mowiol® 10-98, Mw ~61,000
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Poly(vinyl alcohol), average Mw 13,000-23,000, 98% hydrolyzed
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$59.80
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$160.00
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$80.09
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Poly(acrylic acid, sodium salt) solution, average Mw ~1,200, 45 wt. % in H2O
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$247.00
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