PURPOSE: To enlarge gas permeation characteristics and to attempt to improve membrane characteristics by placing a plurality of hollow separation membranes with separation function therein along the longitudinal direction of a fibrous body consisting of a porous layer with reinforcing function and laminating a porous layer with reinforcing function on the inner surface of a separation membrane.
CONSTITUTION: A plurality of hollow separation membranes B with separation function therein along the longitudinal direction of a fibrous body consisting of a porous layer A with reinforcing function exist and a porous layer C with reinforcing function is laminated on the inner surface of a separation membrane. Gas permeation characteristics is made thereby about 3.8 times larger than the conventional composite membrane even when the outer diameters and the fine pore structures of the porous layers A and C and the thickness of the separation membrane B are the same as those for the conventional composite membrane and the membrane characteristics can be improved by increase in the membrane area of the separation membrane B. In addition, it is possible to miniaturize furthermore various membrane modules wherein the conventional composite membranes are used by using this multifilament type hollow fiber composite membrane.
YAMAMOTO NOBUYUKI
HIRAI TAKAYUKI
OKAMOTO MASAJI
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