METHOD FOR PURIFICATION OF SOLUTIONS OF POLYVINYLPYRROLIDONE Russian patent published in 1996 - IPC

Abstract RU 2057144 C1

FIELD: chemical technology. SUBSTANCE: method involves passing of aqueous solution of polyvinylpyrrolidone through cross-linked cation-exchange macroporous resins on the base of styrene and divinylbenzene copolymers and through cross-linked macroporous anionites, said process being carried out step by step. Mentioned above cation-exchange resins contain sulfo-groups in Na⁺ form, mentioned above anionites contain benzyltrimethyl ammonium groups in OH^- form. The former process is carried out at pH 6.0-7.5, the latter at pH 8.5-9.5. EFFECT: improves efficiency of method.

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RU 2 057 144 C1

Authors

Donetskij I.A.

Guljaev V.A.

Persanova L.V.

Krjukova G.N.

Khljabich G.N.

Dates

1996-03-27—Published

1992-05-12—Filed