Process for separating polyvinyl alcohol from its solution

Details Process for separating polyvinyl alcohol from its solution Process for separating polyvinyl alcohol from its solution

C - Chemistry, Metallurgy

08

J

402/496, 362/62

C08J 11/04 (2006.01) C02F 1/24 (2006.01) C02F 1/52 (2006.01) C02F 9/00 (2006.01) C08F 6/12 (2006.01) C08J 11/06 (2006.01)

Patent

CA 1101599

ABSTRACT OF THE DISCLOSURE A process for the separation or extraction of polyvinyl alcohol from its solution which includes adding to an aqueous solution comprising polyvinyl alcohol, a coating agent consisting essentially of a salt of boric acid and a salting agent which is member selected from the group con- sisting of inorganic acid salt of a metal of first or second groups of the periodic table, an inorganic ammonium salt and an inorganic aluminium salt; agitating the resulting mixture to coagulate the polyvinyl alcohol and separ- ating the coagulated polyvinyl alcohol from the mixture in order to minimize the discharge of PVA in waste waters, into the environment.

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