EP 1244840 A4 20030416 - BLEACHING PULP WITH HIGH-PRESSURE O 2?
Title (en)
BLEACHING PULP WITH HIGH-PRESSURE O 2?
Title (de)
SAUERSTOFF-HOCHDRUCK-BLEICHUNG EINER PULPE
Title (fr)
BLANCHIMENT D'UNE PULPE A L'OXYGENE SOUS HAUTE PRESSION
Publication
Application
Priority
- US 0015263 W 20000602
- US 13804399 P 19990608
- US 51014000 A 20000222
Abstract (en)
[origin: WO0075420A1] A process for oxygen bleaching pulp in which the pulp is pre-treated prior to oxygen bleaching (52), e.g. to remove the hexeneuroonic acid. Oxygen bleaching (36, 42) is accomplished at high pressure in two stages with a medium consistency pump (32). The wash from the bleaching stage is not recycled into the chemical recovery system. A final whitening sequence includes at least one chlorine dioxide stage followed by an alkaline peroxide stage with no intervening wash is also included.
IPC 1-7
IPC 8 full level
D21C 9/10 (2006.01); D21C 9/147 (2006.01)
CPC (source: EP)
D21C 9/1005 (2013.01); D21C 9/1057 (2013.01); D21C 9/147 (2013.01)
Citation (search report)
- [Y] US 4507172 A 19850326 - STELTENKAMP MICHAEL S [US]
- [Y] US 3725194 A 19730403 - SMITH L, et al
- [Y] US 3652385 A 19720328 - NOREUS STURE ERIK OLOF, et al
- [Y] BE 1005800 A3 19940201 - SOLVAY INTEROX [BE]
- [Y] US 5656130 A 19970812 - ALI OMAR F [US]
- [A] EP 0899374 A1 19990303 - OJI PAPER CO [JP]
- [A] US 5034094 A 19910723 - KURPLE KENNETH R [US]
- [X] EP 0831170 A2 19980325 - CHAMPION INT CORP [US]
- [X] WO 9111554 A1 19910808 - EKA NOBEL AB [SE]
- [X] WO 9821400 A1 19980522 - SUNDS DEFIBRATOR IND AB [SE], et al
- [X] US 3536577 A 19701027 - RAPSON WILLIAM HOWARD
- [A] WO 9612063 A1 19960425 - AHLSTROEM OY [FI], et al
- [X] ROBITAILLE M A: "HYDROGEN PEROXIDE: A VERSATILE BLEACHING AGENT", PULP AND PAPER CANADA, ST LAURENT, CA, vol. 89, no. 12, 1988, pages 167 - 170, XP002930534
- See references of WO 0075420A1
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 0075420 A1 20001214; AU 5317700 A 20001228; CA 2376528 A1 20001214; EP 1244840 A1 20021002; EP 1244840 A4 20030416
DOCDB simple family (application)
US 0015263 W 20000602; AU 5317700 A 20000602; CA 2376528 A 20000602; EP 00938089 A 20000602