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2 092 493

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IPC

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Application

93056101/04, 1993-12-20

(22)

Actual filing date

1993-12-20

(45)

Published

1997-10-10

(72)

Inventor

Kostochko A.V.Krasnov I.N.Petrov A.I.Vasil'Ev V.F.Kolesov B.S.Il'In V.V.Safina Z.M.

(73)

Holder

Proizvodstvennoe Ob"Edinenie Khimicheskij Kombinat Im.A.A.Kosjakova"

METHOD OF PREPARING COMPLEX CELLULOSE ACETONITRATE Russian patent published in 1997 - IPC

Abstract RU 2092493 C1

FIELD: chemical industry. SUBSTANCE: preground and diphenyl-amine-free pyroxyline powder is transesterified with acylating mixture of acetic anhydride, methylene chloride and catalyst in 30-60:53-132:0.18-2.0. Pyroxyline powder crumb is first dehydrated with aliphatic alcohol and then extracted with methylene chloride. EFFECT: more efficient preparation method. 2 cl, 1 tbl

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RU 2 092 493 C1

Authors

Kostochko A.V.

Krasnov I.N.

Petrov A.I.

Vasil'Ev V.F.

Kolesov B.S.

Il'In V.V.

Safina Z.M.

Dates

1997-10-10—Published

1993-12-20—Filed

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