PROCESS FOR PREPARING A PULP-COOKING SOLUTION

Title:

PROCESS FOR PREPARING A PULP-COOKING SOLUTION

Document Type and Number:

WIPO Patent Application WO1997019220

Kind Code:

A3

Abstract:

The proposed invention deals with pulp and paper production, in particular, with the process for preparing pulp cooking liquors to manufacture a fibrous semifabricate. A cooking liquor is proposed to be prepared by saturation of a water medium with sulfurous anhydride provided that this water medium is in fact either a pulp and paper mill waste water with activated sludge (18-40g/l) and soda ash (1,55-2,50% by weight) in it or alkali hydrolyzate produced in treatment of the same waste water by a mixture of base salts containing sodium carbonate (50-90% by weight based on Na2O) at the temperature 25-40 DEG C followed up with a solid sediment removal and the saturation goes on until sulfurous anhydride concentration in the liquor is 2,5-5,5% by weight. The proposed method allows to increase considerably the output of a fibrous semi-fabricate and improve its mechanical characteristics not to speak of utilizing waste water generated at a waste water treatment plant of a pulp and paper mill and expanding a sources of raw materials needed for cooking liquors preparation.

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Inventors:

GRUDININ VLADIMIR PAVLOVICH (RU)
GRUDININ ALEXANDR VLADIMIROVIC (RU)

Application Number:

PCT/RU1996/000323

Publication Date:

August 14, 1997

Filing Date:

November 13, 1996

Export Citation:

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Assignee:

PUKANOV VITALY VALERIEVICH (RU)
GRUDININ VLADIMIR PAVLOVICH (RU)
GRUDININ ALEXANDR VLADIMIROVIC (RU)

International Classes:

D21C3/02; D21C3/06; D21C3/04; D21C11/00; (IPC1-7): D21C/

Foreign References:

SU783386A1	1980-11-30
SU746002A1	1980-07-07
SU1074929A1	1984-02-23
SU1608274A1	1990-11-23
SU1164347A1	1985-06-30
SU896125A1	1982-01-07
GB1432245A	1976-04-14
GB1433307A	1976-04-28
DE2320812C2	1982-06-16
DE2640885B2	1978-06-15
DE3142787A1	1982-07-15

Other References: