Global patent index - EP 1040222 A1

EP 1040222 A1 2000-10-04 - BLEACHING OF CHEMICAL PULP WITH PERACID

Title (en)

BLEACHING OF CHEMICAL PULP WITH PERACID

Title (de)

BLEICHEN VON ZELLSTOFF MITTELS PERSÄURE

Title (fr)

BLANCHIMENT DE PATE CHIMIQUE AVEC DU PERACIDE

Publication

EP 1040222 A1 (EN)

Application

EP 98961279 A

Priority

  • FI 9800993 W
  • FI 974575 A

Abstract (en)

[origin: WO9932710A1] The invention relates to a process for the bleaching of chemical pulp and the use of a bleaching solution. According to the invention the pulp is treated in a plurality of different steps by using at least in one step a bleaching solution which contains a peracid, and the essential idea of the invention is that the peracid is used in a post-bleaching which is the last step of the bleaching process, the post-bleaching being carried out in the presence of one or more earth-alkali metal compounds. By using a peracid the pulp is brought to its final brightness, and the purpose of the earth-alkali metal added is to combat the lowering of the viscosity of the pulp. According to the invention the post-bleaching can be carried out after the bleach plant steps in a pulp flow pipe, a storage tower or in the paper machine at a paper mill.

IPC 1-7 (main, further and additional classification)

D21C 9/16; D21H 21/32

IPC 8 full level (invention and additional information)

D21C 9/10 (2006.01); D21C 9/16 (2006.01); D21H 21/32 (2006.01)

CPC (invention and additional information)

D21H 21/32 (2013.01); D21C 9/166 (2013.01)

Citation (search report)

See references of WO 9932710A1

Designated contracting state (EPC)

AT BE CH CY DE DK ES FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

WO 9932710 A1 19990701; AT 385526 T 20080215; AU 1674399 A 19990712; BR 9813747 A 20001017; BR 9813747 B1 20090113; CA 2315063 A1 19990701; CA 2315063 C 20081118; DE 69839097 D1 20080320; DE 69839097 T2 20090129; EP 1040222 A1 20001004; EP 1040222 B1 20080206; ES 2302362 T3 20080701; FI 112958 B 20040213; FI 974575 A0 19971219; FI 974575 A 19990620; JP 2001527168 A 20011225; JP 4499280 B2 20100707; PT 1040222 E 20080505

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