Title (en)

METHOD FOR BLEACHING PULP WITH CHLORINE DIOXIDE

Title (de)

VERFAHREN ZUM BLEICHEN VON PULPE DURCH CHLORDIOXYD

Title (fr)

PROCEDE DE BLANCHIMENT DE LA PATE A PAPIER A L'AIDE DE BIOXYDE DE CHLORE

Publication

EP 1242678 A1 20020925 (EN)

Application

EP 00956547 A 20000825

Priority

• FI 0000724 W 20000825
• FI 991815 A 19990826
• FI 19991816 A 19990826
• FI 19991817 A 19990826

Abstract (en)

[origin: WO0114632A1] A method of treating pulp with chlorine dioxide according to which clorine dioxide is mixed in the pulp and the mixture thus produced is fed into a treatment vessel (42) in which the chlorine dioxide treatment is carried out at a temperature of 40-90 DEG C and at a pH of 1.5-6.5. The pulp is discharged from the treatment vessel in a closed space straight to a chlorine dioxide stage washer (44) ensuring that no detrimental amounts of residual dioxide remain in the pulp flowing to the washer.

IPC 1-7

D21C 9/14

IPC 8 full level

D21C 9/02 (2006.01); D21C 9/14 (2006.01)

CPC (source: EP)

D21C 9/02 (2013.01); D21C 9/14 (2013.01)

Citation (search report)

See references of WO 0114632A1

Designated contracting state (EPC)

ES FI FR PT SE

DOCDB simple family (publication)

WO 0114632 A1 20010301; AU 6844800 A 20010319; BR 0013600 A 20020430; CA 2382866 A1 20010301; CA 2382866 C 20090120; EP 1242678 A1 20020925; EP 1242678 B1 20030917; EP 1242678 B9 20040609; ES 2204676 T3 20040501; PT 1242678 E 20031231

DOCDB simple family (application)

FI 0000724 W 20000825; AU 6844800 A 20000825; BR 0013600 A 20000825; CA 2382866 A 20000825; EP 00956547 A 20000825; ES 00956547 T 20000825; PT 00956547 T 20000825