PL309190A1 - Method of bleaching a lignocellulose containing pulp - Google Patents

Method of bleaching a lignocellulose containing pulp

Info

Publication number
PL309190A1
PL309190A1 PL93309190A PL30919093A PL309190A1 PL 309190 A1 PL309190 A1 PL 309190A1 PL 93309190 A PL93309190 A PL 93309190A PL 30919093 A PL30919093 A PL 30919093A PL 309190 A1 PL309190 A1 PL 309190A1
Authority
PL
Poland
Prior art keywords
pulp
bleaching
brightness
stages
lignocellulose
Prior art date
Application number
PL93309190A
Inventor
Magnus Linsten
Jiri Basta
Ann-Sofie Haellstroem
Original Assignee
Eka Nobel Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=26661599&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=PL309190(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from SE9203584A external-priority patent/SE9203584D0/en
Priority claimed from SE9300225A external-priority patent/SE9300225D0/en
Application filed by Eka Nobel Ab filed Critical Eka Nobel Ab
Publication of PL309190A1 publication Critical patent/PL309190A1/en

Links

Classifications

    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21CPRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10Bleaching ; Apparatus therefor
    • D21C9/1026Other features in bleaching processes
    • D21C9/1042Use of chelating agents
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21CPRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10Bleaching ; Apparatus therefor
    • D21C9/16Bleaching ; Apparatus therefor with per compounds
    • D21C9/166Bleaching ; Apparatus therefor with per compounds with peracids

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Micro-Organisms Or Cultivation Processes Thereof (AREA)

Abstract

The present invention relates to a process for bleaching of lignocellulose-containing pulp, where the pulp is first treated with a complexing agent, then delignified with an organic peracid or a salt thereof, and subsequently bleached with a peroxide-containing compound, ozone or sodium dithionite. Before bleaching, the pulp is washed at a pH of at least about 4. Suitably, delignification is performed with the strongly oxidizing peracetic acid, so that a considerable increase in brightness as well as a considerable reduction of the kappa number are obtained after said bleaching. The brightness-increasing effect is very selective, i.e. the viscosity of the pulp is maintained to a relatively great extent. By a suitable choice of pH in all the stages before the chlorine-free bleaching, the advantageous metal ions are retained in the pulp, while at the same time the pH adjustment between the stages is minimized and the resulting spent bleach liquors are advantageously used internally, e.g. for washing the pulp.
PL93309190A 1992-11-27 1993-11-25 Method of bleaching a lignocellulose containing pulp PL309190A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9203584A SE9203584D0 (en) 1992-11-27 1992-11-27 PROCEDURES FOR BLACKING OF LIGNOCELLULOSALLY MACHINE
SE9300225A SE9300225D0 (en) 1993-01-26 1993-01-26 PROCEDURES FOR BLACKING OF LIGNOCELLULOSALLY MACHINE

Publications (1)

Publication Number Publication Date
PL309190A1 true PL309190A1 (en) 1995-09-18

Family

ID=26661599

Family Applications (1)

Application Number Title Priority Date Filing Date
PL93309190A PL309190A1 (en) 1992-11-27 1993-11-25 Method of bleaching a lignocellulose containing pulp

Country Status (16)

Country Link
EP (1) EP0670929B2 (en)
JP (1) JPH08503749A (en)
AT (1) ATE141972T1 (en)
AU (1) AU671337B2 (en)
BR (1) BR9307520A (en)
CA (1) CA2149649C (en)
CZ (1) CZ285246B6 (en)
DE (1) DE69304342T3 (en)
ES (1) ES2091121T3 (en)
FI (1) FI118572B (en)
MX (1) MX9307413A (en)
NO (1) NO306737B1 (en)
NZ (1) NZ258273A (en)
PL (1) PL309190A1 (en)
RU (1) RU2097463C1 (en)
WO (1) WO1994012722A1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1007757A3 (en) * 1993-11-10 1995-10-17 Solvay Interox Method of laundering of chemical pulp.
US5656130A (en) * 1995-04-28 1997-08-12 Union Camp Holding, Inc. Ambient temperature pulp bleaching with peroxyacid salts
USH1690H (en) * 1995-07-20 1997-11-04 Nye; Jeffrey Process for bleaching kraft pulp
SE9503004L (en) * 1995-08-30 1997-03-01 Sunds Defibrator Ind Ab Bleaching of pulp
DE19704054C2 (en) * 1997-02-04 2000-08-10 Stockhausen Chem Fab Gmbh Process for the production of fibrous materials with improved properties
US6702921B2 (en) * 2001-05-01 2004-03-09 Ondeo Nalco Company Methods to enhance pulp bleaching and delignification using an organic sulfide chelating agent
PT1607519E (en) * 2004-06-14 2008-04-16 Warwick Internat Group Ltd Activator for pulp bleaching

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2219505C3 (en) 1972-04-21 1974-10-17 Deutsche Gold- Und Silber-Scheideanstalt Vormals Roessler, 6000 Frankfurt Chlorine-free multi-stage bleaching of cellulose
DE3005947B1 (en) 1980-02-16 1981-01-29 Degussa Process for bleaching pulp using organic peracid
JPS5721591A (en) 1980-07-11 1982-02-04 Mitsubishi Gas Chemical Co Peroxide bleaching of wood pulp
EP0402335B2 (en) * 1989-06-06 2001-03-14 Eka Chemicals AB Process for bleaching lignocellulose-containing pulps
US5091054A (en) * 1989-08-18 1992-02-25 Degussa Corporation Process for bleaching and delignification of lignocellulosic
BE1004674A3 (en) * 1991-03-11 1993-01-12 Interox Internat Sa Method of laundering of chemical pulp and application of the method of laundering pulp kraft.
DE4114135A1 (en) 1991-04-30 1992-11-05 Sueddeutsche Kalkstickstoff Chlorine-free bleaching and delignification of alkali cellulose - by first treating with aq. organic peracid soln. and then with cyanamide (salt) activated hydrogen peroxide soln.
ES2120984T3 (en) * 1991-10-04 1998-11-16 Solvay Interox Inc A PROCEDURE TO IMPROVE THE SELECTIVITY OF THE DELIGNIFICATION OF A CHEMICAL PAPER PASTE.
BE1006057A3 (en) 1992-07-06 1994-05-03 Solvay Interox Method for delignification of chemical pulp.

Also Published As

Publication number Publication date
EP0670929B1 (en) 1996-08-28
NO952074D0 (en) 1995-05-26
ES2091121T3 (en) 1996-10-16
AU5583194A (en) 1994-06-22
WO1994012722A1 (en) 1994-06-09
FI952551A (en) 1995-05-24
RU2097463C1 (en) 1997-11-27
ATE141972T1 (en) 1996-09-15
DE69304342T3 (en) 2004-07-01
EP0670929B2 (en) 2003-10-22
DE69304342D1 (en) 1996-10-02
NZ258273A (en) 1996-08-27
RU95113460A (en) 1996-12-27
EP0670929A1 (en) 1995-09-13
FI952551A0 (en) 1995-05-24
CZ285246B6 (en) 1999-06-16
CZ132895A3 (en) 1996-01-17
NO306737B1 (en) 1999-12-13
NO952074L (en) 1995-07-26
FI118572B (en) 2007-12-31
MX9307413A (en) 1994-07-29
JPH08503749A (en) 1996-04-23
CA2149649C (en) 2000-09-19
AU671337B2 (en) 1996-08-22
BR9307520A (en) 1999-08-31
DE69304342T2 (en) 1997-03-06

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