Process for the separation of polyvinyl alcohol from aqueous...

Details Process for the separation of polyvinyl alcohol from aqueous... Process for the separation of polyvinyl alcohol from aqueous...

C - Chemistry, Metallurgy

08

F

402/496

C08F 6/12 (2006.01) C02F 9/00 (2006.01) C08F 116/06 (2006.01) C08J 11/06 (2006.01)

Patent

CA 1121549

HOE 77/F 002 PROCESS FOR THE SEPARATION OF POLYVINYL ALCOHOL FROM AQUEOUS SOLUTIONS Abstract of the disclosure: In order to protect the environment from pollution, it is desirable to keep the polyvinyl alcohol content in waste waters as low as possible. Polyvinyl alcohol may be removed from waste waters by means of microorganisms on the one hand, and on the other according to chemical/mechanical methods by salting-out and precipitation and subsequent separation of the solids. Ad- vantageous is the precipitation in the form of a polyvinyl al- cohol/boric acid/oidiol complex, especially by means of alka- line earth metal hydroxides in an alkaline medium. Calcium hy- droxide is a particularly suitable alkaline earth metal hydroxide.

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