title: Pervaporation dehydration of ethanol by hyaluronic acid/sodium alginate two-active-layer composite membranes.
abstract: The composite membranes with two-active-layer (a capping layer and an inner layer) were prepared by sequential spin-coatings of hyaluronic acid (HA) and sodium alginate (NaAlg) on the polyacrylonitrile (PAN) support layer. The SEM showed a mutilayer structure and a distinct interface between the HA layer and the NaAlg layer. The coating sequence of two-active-layer had an obvious influence on the pervaporation dehydration performance of membranes. When the operation temperature was 80 °C and water concentration in feed was 10 wt.%, the permeate fluxes of HA/Alg/PAN membrane and Alg/HA/PAN membrane were similar, whereas the separation factor were 1130 and 527, respectively. It was found that the capping layer with higher hydrophilicity and water retention capacity, and the inner layer with higher permselectivity could increase the separation performance of the composite membranes. Meanwhile, effects of operation temperature and water concentration in feed on pervaporation performance as well as membrane properties were studied.
authors.affiliation: Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, 92 Weijin Road, Nankai District, Tianjin 300072, China; Key Laboratory for Green Technology of Ministry of Education, R & D Center for Petrochemical Technology, Tianjin University, Tianjin 300072, China.
authors.forename: Chengyun
authors.initials: C
authors.lastname: Gao
authors.forename: Minhua
authors.initials: M
authors.lastname: Zhang
authors.forename: Jianwu
authors.initials: J
authors.lastname: Ding
authors.forename: Fusheng
authors.initials: F
authors.lastname: Pan
authors.forename: Zhongyi
authors.initials: Z
authors.lastname: Jiang
authors.forename: Yifan
authors.initials: Y
authors.lastname: Li
authors.forename: Jing
authors.initials: J
authors.lastname: Zhao
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry; D000464:Alginates / Q000737:chemistry*; D003890:Desiccation; D000431:Ethanol / Q000737:chemistry*; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D006820:Hyaluronic Acid / Q000737:chemistry*; D008567:Membranes, Artificial; D008855:Microscopy, Electron, Scanning; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D014867:Water / Q000737:chemistry
chemical_list: D000180:Acrylic Resins; D000464:Alginates; D006603:Hexuronic Acids; D008567:Membranes, Artificial; D014867:Water; C010504:polyacrylonitrile; D000431:Ethanol; D020723:Glucuronic Acid; D006820:Hyaluronic Acid
keywords: Ethanol dehydration; Hyaluronic acid; Pervaporation; Sodium alginate; Two-active-layer composite membrane