EP 1322814 B1 20110309 - METHOD FOR BLEACHING PAPER PULP
Title (en)
METHOD FOR BLEACHING PAPER PULP
Title (de)
VERFAHREN ZUM BLEICHEN VON ZELLSTOFF
Title (fr)
PROCEDE DE BLANCHIMENT DE PATES A PAPIER
Publication
Application
Priority
- FR 0102867 W 20010914
- FR 0011831 A 20000918
Abstract (en)
[origin: US6866749B2] The invention concerns a method for bleaching different types of paper pulp in two steps at atmospheric pressure and at a temperature not higher than 100 DEG C. The first step consists in contacting the unbleached paste with a mixture of paracetic acid and performic acid. The second step consists in treating the bleached pulp derived from the first step, with a solution of soda and hydrogen peroxide. The resulting pulps exhibit a high index of whiteness and a degree of polymerisation close to unbleached pulps. The method is environmentally safe and non-polluting.
IPC 8 full level
CPC (source: EP US)
D21C 9/101 (2013.01 - EP US); D21C 9/1057 (2013.01 - EP US); D21C 9/163 (2013.01 - EP US); D21C 9/166 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
DOCDB simple family (publication)
WO 0222945 A1 20020321; AT E501305 T1 20110315; AU 2001290028 B2 20051201; AU 9002801 A 20020326; BR 0113955 A 20030722; CA 2422610 A1 20020321; CA 2422610 C 20091201; CN 1231634 C 20051214; CN 1458996 A 20031126; DE 60144190 D1 20110421; DK 1322814 T3 20110614; EA 005240 B1 20041230; EA 200300383 A1 20030828; EP 1322814 A1 20030702; EP 1322814 B1 20110309; EP 1322814 B8 20110525; ES 2360503 T3 20110606; FR 2814180 A1 20020322; FR 2814180 B1 20031205; PT 1322814 E 20110502; US 2004035537 A1 20040226; US 6866749 B2 20050315
DOCDB simple family (application)
FR 0102867 W 20010914; AT 01969897 T 20010914; AU 2001290028 A 20010914; AU 9002801 A 20010914; BR 0113955 A 20010914; CA 2422610 A 20010914; CN 01815858 A 20010914; DE 60144190 T 20010914; DK 01969897 T 20010914; EA 200300383 A 20010914; EP 01969897 A 20010914; ES 01969897 T 20010914; FR 0011831 A 20000918; PT 01969897 T 20010914; US 38006603 A 20030813