EP 1161593 A1 20011212 - OXYGEN DELIGNIFICATION OF PULP IN THE PRESENCE OF CARBONATES AS ALKALI
Title (en)
OXYGEN DELIGNIFICATION OF PULP IN THE PRESENCE OF CARBONATES AS ALKALI
Title (de)
SAUERSTOFFDELIGNIFIZIERUNG VON ZELLSTOFF IN GEGENWART VON CARBONAT ALS ALKALI
Title (fr)
DELIGNIFICATION A L'OXYGENE DE LA PATE A PAPIER EN PRESENCE DE CARBONATES COMME ALCALI
Publication
Application
Priority
- SE 0000172 W 20000128
- SE 9900425 A 19990209
Abstract (en)
[origin: WO0047813A1] A process for oxygen delignification of chemical pulp comprising an oxygen treatment unit operation stage in which the pulp is treated while suspended in an aqueous solution with oxygen in the presence of alkali, whereby the pulp consistency is less than 20%; more than 50 percentage by weight of the alkali consist of one or more carbonates; and the pH of the aqueous solution during the process is adapted to provide for the essential absence of bicarbonate in said solution during the treatment. Furthermore a process for the bleaching of chemical pulp comprising a peroxide bleaching unit operation stage and an oxygen delignification process of said kind.
IPC 1-7
IPC 8 full level
D21C 9/147 (2006.01)
IPC 8 main group level
D21C (2006.01)
CPC (source: EP SE)
D21C 9/147 (2013.01 - EP SE)
Citation (search report)
See references of WO 0047813A1
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 0047813 A1 20000817; AU 2952400 A 20000829; EP 1161593 A1 20011212; SE 9900425 D0 19990209; SE 9900425 L 20000904
DOCDB simple family (application)
SE 0000172 W 20000128; AU 2952400 A 20000128; EP 00908150 A 20000128; SE 9900425 A 19990209