EP 0863250 A4 19981125 - PROCESS FOR PREPARING A PULP-COOKING SOLUTION
Title (en)
PROCESS FOR PREPARING A PULP-COOKING SOLUTION
Title (de)
VERFAHREN ZUR HERSTELLUNG EINER LANGE ZUR ZELLSTOFFKOCHUNG
Title (fr)
PROCEDE DE PREPARATION D'UNE LIQUEUR DE CUISSON PERMETTANT D'OBTENIR UN PRODUIT SEMI-FINI FIBREUX
Publication
Application
Priority
- RU 9600323 W 19961113
- RU 95119640 A 19951121
Abstract (en)
[origin: EP0863250A2] 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.
IPC 1-7
IPC 8 full level
D21C 3/06 (2006.01); D21C 3/02 (2006.01); D21C 3/04 (2006.01); D21C 11/00 (2006.01)
CPC (source: EP KR)
D21C 3/02 (2013.01 - EP KR); D21C 3/06 (2013.01 - EP KR); D21C 11/0021 (2013.01 - EP KR)
Citation (search report)
- [A] US 4155804 A 19790522 - EDGE DEXTER JR [US]
- [A] DATABASE WPI Section Ch Week 8248, Derwent World Patents Index; Class F01, AN 82-04327J, XP002076146
- See references of WO 9719220A2
Designated contracting state (EPC)
AT DE ES FI FR PT SE
DOCDB simple family (publication)
EP 0863250 A2 19980909; EP 0863250 A4 19981125; AU 7713796 A 19970611; BR 9611644 A 19990713; CA 2238100 A1 19970329; CN 1207782 A 19990210; JP 2000500538 A 20000118; KR 19990071498 A 19990927; NO 982293 D0 19980520; NO 982293 L 19980720; RU 2091529 C1 19970927; WO 9719220 A2 19970529; WO 9719220 A3 19970814
DOCDB simple family (application)
EP 96940192 A 19961113; AU 7713796 A 19961113; BR 9611644 A 19961113; CA 2238100 A 19961113; CN 96199607 A 19961113; JP 51963397 A 19961113; KR 19980703770 A 19980520; NO 982293 A 19980520; RU 95119640 A 19951121; RU 9600323 W 19961113