PURPOSE: To obtain a composite membrane excellent in selectivity and permeability at gas separation, pervaporation and perstruction separation by coating a membrane material of a separation layer on a wet support layer containing a controlled amount of liquid.
CONSTITUTION: Polysulfone hollow fibers as a support layer is saturated with a liquid such as isopropanol aq. soln. to be wet, is partially dried so that controlled amount of liquid in the range of 10 to 90% by weight remains, is then coated with an isopropanol soln. or the like of Ethyl Cellulose and then is dried to form the separation layer on the support layer. In this case, as the liquid is present in the support layer, the coating does not infiltrate into fine holes in the support layer. The composite membrane thus obtained is excellent in selectivity, especially at air separation, and has high oxygen permeability.
BENJIYAMIN BIKUSON
JIYOISU KATSUTSU NERUSON
ROBAATO DAGURASU BAACHIESUKI
| JPS54102292A | 1979-08-11 | |||
| JPS6099314A | 1985-06-03 | |||
| JPS5316373A | 1978-02-15 | |||
| JPS58180206A | 1983-10-21 |
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