EP0844328A3 - Process for improving the selectivity in the delignification of a chemical pulp - Google Patents

Process for improving the selectivity in the delignification of a chemical pulp Download PDF

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Publication number
EP0844328A3
EP0844328A3 EP97122629A EP97122629A EP0844328A3 EP 0844328 A3 EP0844328 A3 EP 0844328A3 EP 97122629 A EP97122629 A EP 97122629A EP 97122629 A EP97122629 A EP 97122629A EP 0844328 A3 EP0844328 A3 EP 0844328A3
Authority
EP
European Patent Office
Prior art keywords
delignification
selectivity
improving
chemical pulp
pulp
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP97122629A
Other languages
German (de)
French (fr)
Other versions
EP0844328A2 (en
Inventor
Roy T. Hill
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Solvay Interox Inc
Original Assignee
Solvay Interox Inc
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=27118364&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0844328(A3) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Solvay Interox Inc filed Critical Solvay Interox Inc
Publication of EP0844328A2 publication Critical patent/EP0844328A2/en
Publication of EP0844328A3 publication Critical patent/EP0844328A3/en
Withdrawn legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-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
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/16—Bleaching ; Apparatus therefor with per compounds
    • D21C9/166—Bleaching ; Apparatus therefor with per compounds with peracids
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-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
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/1005—Pretreatment of the pulp, e.g. degassing the pulp

Abstract

A process for improving the selectivity of delignification of a chemical paper pulp, in which the pulp is treated with an aqueous solution of an organic peroxy acid at 2 - 47 degrees C., followed by a water wash and a supplementary stage of alkaline extraction in the presence of hydrogen peroxide.
EP97122629A 1991-10-04 1992-09-25 Process for improving the selectivity in the delignification of a chemical pulp Withdrawn EP0844328A3 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US77085991A 1991-10-04 1991-10-04
US770859 1991-10-04
US94283892A 1992-09-10 1992-09-10
US942838 1992-09-10
EP92202952A EP0535741B1 (en) 1991-10-04 1992-09-25 Process for improving the selectivity in the delignification of a chemical pulp

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP92202952A Division EP0535741B1 (en) 1991-10-04 1992-09-25 Process for improving the selectivity in the delignification of a chemical pulp

Publications (2)

Publication Number Publication Date
EP0844328A2 EP0844328A2 (en) 1998-05-27
EP0844328A3 true EP0844328A3 (en) 1998-07-15

Family

ID=27118364

Family Applications (2)

Application Number Title Priority Date Filing Date
EP97122629A Withdrawn EP0844328A3 (en) 1991-10-04 1992-09-25 Process for improving the selectivity in the delignification of a chemical pulp
EP92202952A Revoked EP0535741B1 (en) 1991-10-04 1992-09-25 Process for improving the selectivity in the delignification of a chemical pulp

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP92202952A Revoked EP0535741B1 (en) 1991-10-04 1992-09-25 Process for improving the selectivity in the delignification of a chemical pulp

Country Status (9)

Country Link
EP (2) EP0844328A3 (en)
JP (1) JPH05195467A (en)
AT (1) ATE168149T1 (en)
AU (1) AU660326B2 (en)
DE (1) DE69226143T2 (en)
ES (1) ES2120984T3 (en)
FI (1) FI924448A (en)
NZ (1) NZ244592A (en)
PL (1) PL171990B1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2269191A (en) * 1992-07-29 1994-02-02 Solvay Interox Ltd Method of treating aqueous process liquors
NZ258273A (en) * 1992-11-27 1996-08-27 Eka Nobel Ab Bleaching lignocellulose pulp using a complexing agent followed by a peracid
WO1994012721A1 (en) * 1992-11-27 1994-06-09 Eka Nobel Ab Process for delignification of lignocellulose-containing pulp
US6007678A (en) * 1992-11-27 1999-12-28 Eka Nobel Ab Process for delignification of lignocellulose-containing pulp with an organic peracid or salts thereof
DE19516151A1 (en) 1995-05-03 1996-11-07 Sven Siegle Process for the production of a pulp from cellulosic material, the pulp itself and its use
EP0794245B1 (en) * 1996-03-04 2003-07-09 The Procter & Gamble Company Laundry pretreatment process and bleaching compositions

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1014536A (en) * 1940-04-01 1952-08-18 Du Pont Wood pulp bleaching improvements
WO1979000637A1 (en) * 1978-02-17 1979-09-06 Mo Och Domsjoe Ab Bleaching lignocellulose material with bleaching agents containing peroxide

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1014536A (en) * 1910-05-24 1912-01-09 Minosaku Takahashi Vessel-closure.
DE3005947B1 (en) * 1980-02-16 1981-01-29 Degussa Process for bleaching pulp using organic peracid
US4793898A (en) * 1985-02-22 1988-12-27 Oy Keskuslaboratorio - Centrallaboratorium Ab Process for bleaching organic peroxyacid cooked material with an alkaline solution of hydrogen peroxide

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1014536A (en) * 1940-04-01 1952-08-18 Du Pont Wood pulp bleaching improvements
WO1979000637A1 (en) * 1978-02-17 1979-09-06 Mo Och Domsjoe Ab Bleaching lignocellulose material with bleaching agents containing peroxide

Also Published As

Publication number Publication date
NZ244592A (en) 1994-02-25
DE69226143D1 (en) 1998-08-13
EP0535741A1 (en) 1993-04-07
ES2120984T3 (en) 1998-11-16
FI924448A (en) 1993-04-05
AU2538292A (en) 1993-04-22
DE69226143T2 (en) 1999-02-25
PL296122A1 (en) 1993-06-28
PL171990B1 (en) 1997-07-31
AU660326B2 (en) 1995-06-22
EP0844328A2 (en) 1998-05-27
JPH05195467A (en) 1993-08-03
EP0535741B1 (en) 1998-07-08
FI924448A0 (en) 1992-10-02
ATE168149T1 (en) 1998-07-15

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