Chinese Journal of Applied Chemistry

Chinese Journal of Applied Chemistry ›› 1993, Vol. 0 ›› Issue (1): 77-79.

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GAS PERMEATION OF MOISTENED POLYVINYLACETAL MEMBRANES

Yi Ying, Yu Xianda, Wu Heping, Wang Anlai, Cao Suqin, Liu Huansui, Li Caiyun   

  1. Lanzhou Institute of Chemical Physics, Academia Sinica, 730000 Lanzhou
  • Received:1991-10-10 Revised:1992-07-22 Published:1993-02-10 Online:1993-02-10

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Abstract: 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.

Key words: polyvinyl alcohol, polyvinylacetals, moistened membrane, gas permeability

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