Concentration of aqueous hydrogen peroxide solution by pervaporation

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• 作者：Sagar Roy ; Atsawin Thongsukmak ; John Tang ; Kamalesh K. Sirkar ; ^{kamalesh.k.sirkar@njit.edu} ; ^{sirkar@adm.njit.edu}
• 关键词：Hydrogen peroxide concentration ; Pervaporation ; PDD&ndash ; TFE copolymer membranes ; Membrane selectivity ; Stability
• 刊名：Journal of Membrane Science
• 出版年：2012
• 出版时间：1 February, 2012
• 年：2012
• 卷：389
• 期：Complete
• 页码：17-24
• 全文大小：557 K

文摘

Pervaporative separation of corrosive liquids is always challenging in terms of finding a suitable polymeric membrane that can withstand the harsh environment especially when concentrating an aqueous solution of a highly oxidizing liquid such as hydrogen peroxide (H₂O₂). H₂O₂ is one of the most powerful oxidizers known and is a stronger oxidant than chlorine, chlorine dioxide and potassium permanganate; hydroxyl radical (OH) generated from H₂O₂ has a very high reactivity. The choice of membrane material is potentially limited to fluoro polymers and perfluoro polymers considering membrane stability in such a harsh system. Perfluorodimethyldioxole-tetrafluoroethylene (PDD-TFE) copolymer membranes (CMS-3 and CMS-7) were used to concentrate hydrogen peroxide from its aqueous solutions. The feed solution composition was varied between 4 and ?0 wt % H₂O₂; the process was studied at 25 ¡ãC, 30 ¡ãC and 35 ¡ãC. CMS-7 displayed a higher flux than CMS-3; a reverse trend was observed for water-H₂O₂ selectivity for the same feed concentration. The highest water-H₂O₂ selectivity of ?2 was observed in CMS-3 membrane at an H₂O₂ concentration of 43 wt % with a total flux of 6.15 ¡Á 10^? g/h cm²; for CMS-7, values of 9.2 and 9.6 ¡Á 10^? g/h cm² were found for water-H₂O₂ selectivity and total flux, respectively, at the same H₂O₂ concentration. The total permeated flux increased with temperature at the cost of selectivity for both membranes. Extended-term behaviors of CMS-3 and CMS-7 membranes studied at 35 wt % H₂O₂ concentration indicated that both are quite stable for tests carried out over periods of 162 and 145 days respectively.