PROCESS FOR PREPARING A PULP-COOKING SOLUTION

Title:

PROCESS FOR PREPARING A PULP-COOKING SOLUTION

Document Type and Number:

WIPO Patent Application WO/1997/019220

Kind Code:

A2

Abstract:

The invention relates to the paper pulp industry, specifically to a process for preparing a pulp cooking solution used for obtaining a fibrous semi-finished product. This involves saturating a solution of sodium carbonate in waste water obtained from the biological purification of paper industry effluent with a concentration of surplus active sludge of 18-40 g/l, having a sodium carbonate concentration of 1.55-2.5 wt.% in units of Na2O, or an alkaline hydrolysate obtained by treating waste water obtained from the biological purification of paper industry effluent with a concentration of surplus active sludge of 18-40 g/l with a mixed base containing 50-90 wt.% sodium carbonate and 10-50 % calcium oxide, in a quantity of 1.55-2.50 wt.% per unit Na2O at a temperature of 25-40 �C with subsequent removal of the solid precipitate, at a temperature of 35-45 �C until it accounts for 2.5-5.5 wt.% of the cooking mixture. The proposed process significantly increases the yield of fibrous semi-finished product and improves its physical and mechanical indicators. It also permits the use of waste obtained from the biological purification of paper industry effluent and widens the range of raw materials which can be used to produce pulp cooking solutions.

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Inventors:

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

Application Number:

PCT/RU1996/000323

Publication Date:

May 29, 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: