EP 1244840 A1 20021002 - 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)
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