Asahi Kasei Kogyo Kabushiki Kaisha

Tsugio Konno

Yasuo Hashino

Masatsugu Yoshino

Hitoshi Sawabu

Kohichi Matsumoto

Giichi Sayanagi

Shinichi Ohkubo

Kaoru Maeda

Hollow fibers of acrylonitrile polymers having water-permeability greater than 0.2 ml/cm.sup.2.min.atm and useful as an inexpensive superior ultrafilter, comprising

Method for producing hollow fibers of acrylonitrile polymers for

An ultrafiltration apparatus comprising a module in which a number of hollow fibers having semipermeable walls, disposed in approximately parallel and collected orderly to form a bundle and fixed with a cast-molding material at at least one end portion thereof, are used as semipermeable membrane, a back washing means and a control means for controlling said module and said back washing means, is presented. Said apparatus can be used for a long time without accompanying reduction of filtration capacity.

Ultrafiltration apparatus

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Fujishi, Japan

Tsugio Konno