EP 1101860 A1 20010523 - Method for bleaching pulp with activated ozone
Title (en)
Method for bleaching pulp with activated ozone
Title (de)
Verfahren zum Bleichen von Pulpe mittels aktivem Ozon
Title (fr)
Procédé de blanchiment de pate a papier par ozone activé
Publication
Application
Priority
US 44332399 A 19991119
Abstract (en)
An ozone based bleaching method for bleaching lignocellulosic materials comprising a bleaching sequence of at least four sequential stages, said stages including an oxidative treatment stage, an alkaline extraction stage, an activated ozone bleaching stage, and a final bleaching stage to produce a pulp of desired final brightness. The activated ozone bleaching stage comprises the addition of an ethanol/DMSO mixture to the pulp prior to the ozone reaction.
IPC 1-7
IPC 8 full level
D21C 9/10 (2006.01); D21C 9/153 (2006.01)
CPC (source: EP KR)
D21C 9/1005 (2013.01 - EP); D21C 9/101 (2013.01 - EP); D21C 9/1057 (2013.01 - KR); D21C 9/142 (2013.01 - KR); D21C 9/153 (2013.01 - EP KR); D21C 9/16 (2013.01 - KR)
Citation (search report)
- [A] WO 9823811 A1 19980604 - KESKUSLABORATORIO [FI], et al
- [A] US 5630906 A 19970520 - BOE JEAN-FRANÇOIS [FR], et al
- [A] DE 3227843 A1 19830224 - CHEMIEFASER LENZING AG [AT]
- [A] US 5411635 A 19950502 - FRANCIS RAYMOND C [US], et al
- [AD] US 4959124 A 19900925 - TSAI TED Y [US] & (JUNE 18-21, 1985) PP. 47-53. [ENGL.]. MEETING INFO.: CPPA/TAPPI INT. PULP BLEACHING CONF. (QUEBEC CITY) PROC.. & TAPPI J., VOL. 81, NO. 4, P. 92. 4 REF., 3 TAB..
- [A] DATABASE PAPERCHEM2 [online] ALLISON, R. W.: "Effects of Temperature and Chemical Pretreatment on Pulp Bleaching with Ozone", XP002158244, retrieved from STN Database accession no. 7580
- [A] DATABASE PAPERCHEM2 [online] NI, Y. (UNIVERSITY OF NEW BRUNSWICK) ET AL: "ECF Sequence for the AlcellRG Process Including an Ethanol -Assisted Ozone Stage", XP002158245, retrieved from STN Database accession no. 5423
Designated contracting state (EPC)
DE ES FR GB IT
DOCDB simple family (publication)
EP 1101860 A1 20010523; BR 0005444 A 20010703; CA 2326311 A1 20010519; CN 1297085 A 20010530; KR 20010051774 A 20010625
DOCDB simple family (application)
EP 00125129 A 20001117; BR 0005444 A 20001117; CA 2326311 A 20001117; CN 00128482 A 20001117; KR 20000068431 A 20001117