Global Patent Index - EP 0408803 A1

EP 0408803 A1 19910123 - Procedure for the bleaching of sulphate pulp.

Title (en)

Procedure for the bleaching of sulphate pulp.

Title (de)

Verfahren zum Bleichen von Sulfatzellstoff.

Title (fr)

Procédé de blanchiment de pâte au sulfate.

Publication

EP 0408803 A1 19910123 (EN)

Application

EP 89117234 A 19890918

Priority

FI 893338 A 19890710

Abstract (en)

The invention concerns a procedure for the bleaching of pulp, in which procedure an oxidating bleaching chemical containing chlorine is used. The essential feature of the invention is that the pulp is treated, either in conjunction with or before oxidation, with a lignin-modifying oxidation-reduction enzyme, such as the lactase produced by the white-rot fungus. The oxidating bleaching chemical used in the procedure may be chlorine dioxide or a mixture of chlorine dioxide and chlorine gas. The use of said enzyme reduces the amount of chlorophenols and other forms of organically bound chlorine in the spent bleach liquor, simultaneously lowering its chemical oxygen demand.

IPC 1-7

D21C 9/10; D21C 9/14

IPC 8 full level

C12S 3/08 (2006.01); D21C 5/00 (2006.01); D21C 9/10 (2006.01); D21C 9/12 (2006.01); D21C 9/14 (2006.01)

CPC (source: EP)

D21C 5/005 (2013.01); D21C 9/1057 (2013.01)

Citation (search report)

  • [A] DE 3636208 A1 19880505 - CALL HANS PETER [DE]
  • [A] TAPPI, vol. 67, no. 10, October 1984, pages 31-33; R. FARRELL: "Biocatalysts hold promise of better pulp quality"

Designated contracting state (EPC)

AT BE CH DE ES FR GB GR IT LI NL SE

DOCDB simple family (publication)

EP 0408803 A1 19910123; EP 0408803 B1 19940112; AT E100157 T1 19940115; CA 1335184 C 19950411; DE 68912322 D1 19940224; ES 2061857 T3 19941216; FI 88316 B 19930115; FI 88316 C 19930426; FI 893338 A0 19890710; FI 893338 A 19910111; JP 2831048 B2 19981202; JP H03130485 A 19910604; NO 175105 B 19940524; NO 175105 C 19940831; NO 893715 D0 19890918; NO 893715 L 19910111

DOCDB simple family (application)

EP 89117234 A 19890918; AT 89117234 T 19890918; CA 611772 A 19890918; DE 68912322 T 19890918; ES 89117234 T 19890918; FI 893338 A 19890710; JP 24166589 A 19890918; NO 893715 A 19890918