| 摘要 |
<p>PURPOSE:To obtain the title membrane excellent in steam permeation velocity and selective separability by utilizing the membrane of a fluororesin-base copolymer having a hydrophilic functional group such as sulfonic group or sulfonate group or utilizing the composite membrane with a material for supporting this membrane. CONSTITUTION:A porous supporting body is impregnated or laminated with fluororesin having hydrophilic functional group such as sulfonic group or sulfonate group and thereby the porous membrane is made a nonporous material in the thickness direction. Air and hydrocarbon-base gas, etc., are substantially not allowed to permeate therethrough. Steam is adsorbed on the surface of the membrane by the hydrophilic functional group of fluororesin and then diffused into the membrane layer and allowed to rapidly permeate therethrough. This membrane can be easily produced in about 0.1-50mum, suitable for industrial mass-production. It has both steam permeation velocity not smaller than 30Nm<3>/m<2>.hr.arm and such performance that the ratio of permeation velocity of gas to be separated from steam is 10000 or more.</p> |
