EP 1834034 A4 20121219 - METHOD FOR OXYGEN DELIGNIFICATION OF CELLULOSE PULP BY MIXING OF CHEMICALS
Title (en)
METHOD FOR OXYGEN DELIGNIFICATION OF CELLULOSE PULP BY MIXING OF CHEMICALS
Title (de)
VERFAHREN ZUR SAUERSTOFFDELIGNIFIZIERUNG VON CELLULOSEPULPE MITTELS VERMISCHUNG VON CHEMIKALIEN
Title (fr)
PROCEDE DE DELIGNIFICATION A L'OXYGENE DE LA PATE A PAPIER PAR MELANGE DE SUBSTANCES CHIMIQUES
Publication
Application
Priority
- SE 2005001274 W 20050905
- SE 0403202 A 20041230
Abstract (en)
[origin: WO2006071163A1] The invention relates to a method for the improved oxygen delignification of cellulose pulp with a medium consistency of 8-16 %. The fraction of dissolved oxygen can be maintained at a high level throughout the process by the use of high pressure, greater than 15.0 bar, and by repeated agitative mixing while maintaining the high pressure, such that as large a fraction as just over 20% of the total oxygen added is dissolved in the fluid phase, and such that the amount of oxygen in the fluid phase is maintained at a high level throughout the complete high pressure section. This means that the amount of oxygen that is dissolved in the fluid phase and that penetrates the cellulose fibres can be maintained at an optimal high level throughout the process for improved delignification of the cellulose.
IPC 8 full level
D21C 9/147 (2006.01)
IPC 8 main group level
D21C (2006.01)
CPC (source: EP SE US)
D21C 9/147 (2013.01 - EP SE US)
Citation (search report)
- [XY] WO 9823810 A1 19980604 - SUNDS DEFIBRATOR IND AB [SE], et al
- [Y] WO 9717489 A1 19970515 - STORA KOPPARBERGS BERGSLAGS AB [SE], et al
- [A] US 6221206 B1 20010424 - BOKSTROEM MONICA [SE], et al
- [A] EP 1067237 A1 20010110 - KVAERNER PULPING TECH [SE]
- [A] US 2001035272 A1 20011101 - BOKSTROM MONICA [SE], et al
- [A] US 6162324 A 20001219 - MILLER WILLIAM J [US]
- [A] EP 0030158 A1 19810610 - BLACK CLAWSON CO [US], et al
- See also references of WO 2006071163A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2006071163 A1 20060706; BR PI0506424 A 20061226; CA 2559362 A1 20060706; EP 1834034 A1 20070919; EP 1834034 A4 20121219; JP 2008527183 A 20080724; SE 0403202 D0 20041230; SE 0403202 L 20051025; SE 526707 C2 20051025; US 2008271861 A1 20081106
DOCDB simple family (application)
SE 2005001274 W 20050905; BR PI0506424 A 20050905; CA 2559362 A 20050905; EP 05777705 A 20050905; JP 2007549311 A 20050905; SE 0403202 A 20041230; US 59583905 A 20050905