SEMIPERMEABLE MEMBRANE FOR SEPARATING ORGANIC MATTER AND ITS PRODUCTION

Japanese Patent JP3218101

B2

PURPOSE: To obtain a high separation performance and to significantly increase the transmitting rate compared with a coating-type composite membrane by filling fine pore parts in the surface of the separation active layer of a semipermeable membrane with a high molecular material different from the material of the semipermeable membrane in a manner that no layer of this polymer material is present on the surface of the semipermeable membrane.
CONSTITUTION: The semipermeable membrane for the separation of org. matter used for pervaporation or vapor transmitting method has such the structure that fine pore parts in the surface of the separation active layer of the simipermeable membrane is filled with a polymer material different from the material of the semipermeable membrane and that no layer of the polymer material is present on the surface of the membrane. Thereby, such a problem of conventional composite membrane is avoided that a polymer coating layer acts as a resistance for transmission and that the transmission rate is largely decreased. Further, since the fine pore parts of the porous membrane are filled with a polymer material, no defect void appears on the membrane surface which occurs in the conventional pervaporation membrane having an asymmetric structure. When a soln. having high concn. of transmitting material is to be pervaporized, the swelling of a coating layer with the transmitting material like a coating composite membrane can be avoided.

Shuji Nakatsuka
Masahiko Sugimoto

JP28679492A

October 15, 2001

October 01, 1992

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Daicel Chemical Industry Co., Ltd.

B01D53/22; B01D67/00; B01D69/00; B01D71/38; B01D71/42; (IPC1-7): B01D69/00; B01D53/22; B01D67/00; B01D71/38; B01D71/42

JP62234523A
JP3193123A
JP398632A
JP3137919A

Kaoru Furuya (3 outside)

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