Abstract: A preparation membrane for pervaporation which comprises a crosslinked reaction mixture of a polyvinyl alcohol or polyvinyl alcohol copolymer and a polystyrene sulfonic acid or polystyrene sulfonic acid copolymer. A method for separating a mixture of water and an organic compound by using the membrane is also disclosed.

Abstract: Acrylic fibers consisting of not more than 90 weight % of an acrylonitrile polymer and less than 10 weight % of a water-absorbing resin having a particular cross-linking density, particle diameter and degree of water-swellability, which are excellent in practical properties such as strength, elongation, color fastness, spinnability and water-absorption.

Abstract: The invention provides an adsorbent suitable for column packing which is composed of a granular material obtained by subjecting a mixture of an activated sludge-containing material and a primary condensate of a formaldehyde type resin and/or a dialdehyde compound to heat-curing and granulating. The adsorbent can advantageously be used to treat industrial waste water containing ionic or nonionic water pollutants such as heavy metal ions, dyes, surfactants, high molecular weight coagulants and mineral oils.

Abstract: The present invention relates to a process for producing an adsorbent for the treatment of waste water, suitable for column packing, which is composed of a granular material obtained by subjecting an aqueous mixture of an activated sludge-containing material and the water-soluble primary condensate of a formaldehyde-type resin and/or an aldehyde compound to a curing treatment with an acid catalyst and a granulating operation. The adsorbent can advantageously be used in disposing of industrial waste water containing ionic or nonionic water pollutants such as heavy metal ions, dyes, surfactants, high molecular weight coagulants and mineral oils.