Global Patent Index - EP 1161593 A1

EP 1161593 A1 2001-12-12 - 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

EP 1161593 A1 (EN)

Application

EP 00908150 A

Priority

  • SE 0000172 W
  • SE 9900425 A

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 (main, further and additional classification)

D21C 9/147

IPC 8 full level (invention and additional information)

D21C 9/147 (2006.01)

IPC 8 main group level (invention and additional information)

D21C (2006.01)

CPC (invention and additional information)

D21C 1/00 (2013.01); D21C 9/147 (2013.01)

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

EPO simple patent family

WO 0047813 A1 20000817; AU 2952400 A 20000829; EP 1161593 A1 20011212; SE 9900425 D0 19990209; SE 9900425 L 20000904

INPADOC legal status


2008-12-17 [18D] APPLICATION DEEMED TO BE WITHDRAWN

- Effective date: 20080624

2008-03-19 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20080213

2001-12-12 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20010720

2001-12-12 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE