EP 3380667 A4 20190417 - METHOD AND SYSTEM FOR OXYGEN DELIGNIFICATION OF CELLULOSE PULP
Title (en)
METHOD AND SYSTEM FOR OXYGEN DELIGNIFICATION OF CELLULOSE PULP
Title (de)
VERFAHREN UND VORRICHTUNG ZUR SAUERSTOFFDELIGNIFIZIERUNG VON ZELLSTOFF
Title (fr)
PROCÉDÉ ET SYSTÈME DE DÉLIGNIFICATION À L'OXYGÈNE DE PÂTE CELLULOSIQUE
Publication
Application
Priority
- SE 1551539 A 20151127
- SE 2016051128 W 20161116
Abstract (en)
[origin: WO2017091129A1] The invention relates to an improved oxygen delignification stage located between 2 wash positions (W1, W2) in a fiberline producing bleached qualities of cellulose pulp. The inventive method and system divide the oxygen stage into at least 2 phases, and after the first phase is the pulp suspension effectively depressurized and vented to atmosphere in order to vent away the bulk volume of inert gases formed during the first phase. The partial pressure of oxygen added to final phase may thus be increased and the amount of oxygen dissolved in the liquid phase is increased enabling better delignification of the cellulose pulp in the final phase.
IPC 8 full level
D21C 9/147 (2006.01)
CPC (source: EP SE)
D21C 9/147 (2013.01 - EP SE); D21C 9/1005 (2013.01 - SE)
Citation (search report)
- [A] US 6514380 B1 20030204 - LAINE ANTERO [FI], et al
- [A] EP 1061173 A1 20001220 - PRAXAIR TECHNOLOGY INC [US]
- [A] US 2005061460 A1 20050324 - RAGNAR MARTIN [SE]
- [A] US 2001050152 A1 20011213 - FORSLUND KJELL [SE], et al
- [A] US 5916415 A 19990629 - MILLER WILLIAM J [US]
- [AD] US 6391152 B1 20020521 - DAHLLOF HAKAN [SE], et al
- [A] WO 2006071163 A1 20060706 - KVAERNER PULPING TECH [SE], et al
- [A] US 4946555 A 19900807 - LEE ROBERT G H [CA], et al
- See references of WO 2017091129A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
WO 2017091129 A1 20170601; BR 112018005525 A2 20181009; BR 112018005525 B1 20220329; EP 3380667 A1 20181003; EP 3380667 A4 20190417; EP 3380667 B1 20200108; SE 1551539 A1 20170528; SE 540043 C2 20180306
DOCDB simple family (application)
SE 2016051128 W 20161116; BR 112018005525 A 20161116; EP 16868982 A 20161116; SE 1551539 A 20151127