EP 1039020 A1 20000927 - Process for bleaching lignocellulosic pulp
Title (en)
Process for bleaching lignocellulosic pulp
Title (de)
Verfahren zum Bleichen von lignocellulosischem Zellstoff
Title (fr)
Procede de blanchiment de pate lignocellulosique
Publication
Application
Priority
- JP 7754999 A 19990323
- JP 22906899 A 19990813
Abstract (en)
Lignocellulose pulp is bleached by bleaching a pulp in aqueous alkali solution with oxygen and treating the pulp with an enzyme, while a liquid fraction delivered from the enzyme treatment step is subjected to a penetration treatment through a separation membrane, for example, reverse osmosis membrane, to separate a permeated fraction from a non-permeated fraction; the permeated fraction is fed to the alkali-oxygen bleaching (oxygen delignification) step and is used as a liquid medium of the bleaching system; and non-permeated fraction is subjected to a xylooligosaccharide-collecting procedure. <IMAGE>
IPC 1-7
IPC 8 full level
D21C 5/00 (2006.01); D21C 9/147 (2006.01); D21C 11/00 (2006.01)
CPC (source: EP)
D21C 5/005 (2013.01); D21C 9/147 (2013.01); D21C 11/0042 (2013.01)
Citation (search report)
- [A] EP 0395792 A2 19901107 - ENSO GUTZEIT OY [FI]
- [A] WO 9815581 A1 19980416 - CYTEL CORP [US], et al
- [A] WO 9102840 A1 19910307 - CULTOR OY [FI]
- [A] WO 9420672 A1 19940915 - UNIV GEORGIA RES FOUND [US]
- [AD] EP 0386888 A2 19900912 - CANADIAN IND [CA]
- [AD] EP 0265970 A2 19880504 - SUNTORY LTD [JP]
Designated contracting state (EPC)
FI SE
DOCDB simple family (publication)
EP 1039020 A1 20000927; EP 1039020 B1 20040218; CA 2301371 A1 20000923; CA 2301371 C 20090901; CA 2627846 A1 20000923; CA 2627846 C 20110104; EP 1304412 A2 20030423; EP 1304412 A3 20030625; EP 1304412 B1 20050914
DOCDB simple family (application)
EP 00302354 A 20000322; CA 2301371 A 20000320; CA 2627846 A 20000320; EP 02028861 A 20000322