Japan Exlan Company Limited

Jinya Takeuchi

Toshiyuki Kobashi

Hideo Naka

The present invention provides a gel having excellent separation ability, operability and a long life, for separating useful components from a rhodanate-containing detoxication treated liquid. The gel consists of a cross-linked polymer with more than 50 weight % of repeating units which are composed of 2,3-dioxypropyl (meth)acrylate or 2,3-dioxypropyl (meth)allyl ether, and whose average particle diameter is more than 10.mu. and gel water content is from 30 to 150%. The present invention also provides a method of separation using said gel.

Gel for the separation of useful components contained in

Hard polyvinyl alcohol gel is produced by copolymerizing a carboxylic acid vinyl ester monomer with a particular cross-linking agent and then saponifying the copolymer. This hard polyvinyl alcohol gel has excellent mechanical strength and separation ability and has no problem in copolymerizability and polymerization speed. Moreover, it shows no change in cross-linked structure before and after saponification.

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Okayama, Japan

Jinya Takeuchi