Pervaporation of water-ethanol mixtures through crosslinked and surface-modified poly(vinyl alcohol) membrane
| Autor: | Wook Lee Sang, Soo Kang Yong, Young Kim Un, Sup Shim Jyong |
|---|---|
| Rok vydání: | 1990 |
| Předmět: |
Vinyl alcohol
Ethanol Chemistry technology industry and agriculture Filtration and Separation Sorption macromolecular substances Permeation Biochemistry chemistry.chemical_compound Adsorption Membrane Chemical engineering Polymer chemistry Surface modification General Materials Science Pervaporation Physical and Theoretical Chemistry |
| Zdroj: | Journal of Membrane Science. 51:215-226 |
| ISSN: | 0376-7388 |
| DOI: | 10.1016/s0376-7388(00)80904-7 |
| Popis: | Pervaporation of water-ethanol mixtures was performed with crosslinked poly (vinyl alcohol) (PVA) membranes. In order to enhance the permselectivity of water through the crosslinked membrane, the surface of the crosslinked PVA membrane was hydrophilically modified by reacting with monochloroacetic acid. The crosslinked and surface-modified membrane exhibited a permselectivity for water enhanced by a factor of nearly 2 compared to that for the only crosslinked membrane, while maintaining the total flux at least unchanged. Thus, it was found that the surface modification technique is a useful means to enhance the permselectivity of water in water-ethanol pervaporation. From the “up” and “down” experimental results, it was concluded that both the preferential sorption at the liquid-membrane interface and the permeability difference at the nearly dry layer of the permeate side of membrane play an important role in determining the permselectivity. |
| Databáze: | OpenAIRE |
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