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Citation: Yi Ying, Yu Xianda, Wu Heping, Wang Anlai, Cao Suqin, Liu Huansui, Li Caiyun. GAS PERMEATION OF MOISTENED POLYVINYLACETAL MEMBRANES[J]. Chinese Journal of Applied Chemistry, ;1993, 10(1): 77-79. shu

GAS PERMEATION OF MOISTENED POLYVINYLACETAL MEMBRANES

1.
Lanzhou Institute of Chemical Physics, Academia Sinica, 730000 Lanzhou

Received Date: 10 October 1991
Available Online: 22 July 1992

The permeabilities of O₂,N₂ and CO₂ were measured at 293K and 303K for the moistened membranes made of polyvinyl alcohol(PVA),polyvinyl aoetal (PVAL),polyvinyl butylral(PVB) and polyvinyl octylral (PVO). The apparatus for measuring the gas permeability of water-moistened membrane is described. It was observed that the permeability coefficients of O₂ and N₂ for the moistened PVA membrane are several hundred times as much as that for anhydrous PVA membrane, with slight increase in the permselectivity of O₂ to N₂. The permeabilities,diffusion and solubility coefficients of O₂, N₂ and CO₂ and permselectivities of O₂ to N₂ and of CO₂ to O₂ in the moistened polyvinyl acetals membranes increase with the increase of the alkyl chain.
- polyvinyl alcohol,
- polyvinylacetals,
- moistened membrane,
- gas permeability
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