Global Patent Index - EP 1101860 A1

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

EP 1101860 A1 20010523 (EN)

Application

EP 00125129 A 20001117

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

D21C 9/10

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