EP0524127A3 - Improvements in a process for delignifying lignocellulosic pulp by means of oxygen - Google Patents

Improvements in a process for delignifying lignocellulosic pulp by means of oxygen Download PDF

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Publication number
EP0524127A3
EP0524127A3 EP19920500075 EP92500075A EP0524127A3 EP 0524127 A3 EP0524127 A3 EP 0524127A3 EP 19920500075 EP19920500075 EP 19920500075 EP 92500075 A EP92500075 A EP 92500075A EP 0524127 A3 EP0524127 A3 EP 0524127A3
Authority
EP
European Patent Office
Prior art keywords
pulp
oxygen
lignocellulosic pulp
delignifying
present
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.)
Granted
Application number
EP19920500075
Other languages
German (de)
French (fr)
Other versions
EP0524127A2 (en
EP0524127B1 (en
Inventor
Jorge Luiz Colodette
Ana Sabina Santos De Campos
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.)
Sa White Martins
Original Assignee
Sa White Martins
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
Application filed by Sa White Martins filed Critical Sa White Martins
Publication of EP0524127A2 publication Critical patent/EP0524127A2/en
Publication of EP0524127A3 publication Critical patent/EP0524127A3/en
Application granted granted Critical
Publication of EP0524127B1 publication Critical patent/EP0524127B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • D21C9/1005—Pretreatment of the pulp, e.g. degassing the pulp
    • 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
    • D21C9/1026—Other features in bleaching processes
    • D21C9/1036—Use of compounds accelerating or improving the efficiency of the processes
    • 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
    • D21C9/147—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)

Abstract

The present invention refers to an improvement for delignifying a lignocellulosic pulp by means of oxygen wherein ethanol is used as an additive and the process is carried out at high temperature thereby obtaining a higher reduction of lignin content of the lignocellulosic pulp, that is, a higher reduction of the Kappa Number in comparison with conventional processes without, however, prejudicing the pulp quality. The use of the present invention provides a pulp which, when subjected to subsequent bleaching sequences, will require a lower amount of chloro compounds in order to achieve the desired whiteness and will also exhibit a high viscosity thus rendering a product with good resistance properties.
EP19920500075 1991-06-14 1992-06-12 Improvements in a process for delignifying lignocellulosic pulp by means of oxygen Expired - Lifetime EP0524127B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BR9102464 1991-06-14
BR9102464A BR9102464A (en) 1991-06-14 1991-06-14 IMPROVEMENT IN THE DESIGNIFICATION PROCESS WITH LIGNOCELLULOSIC PULP OXYGEN

Publications (3)

Publication Number Publication Date
EP0524127A2 EP0524127A2 (en) 1993-01-20
EP0524127A3 true EP0524127A3 (en) 1993-02-03
EP0524127B1 EP0524127B1 (en) 1996-08-14

Family

ID=4052110

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920500075 Expired - Lifetime EP0524127B1 (en) 1991-06-14 1992-06-12 Improvements in a process for delignifying lignocellulosic pulp by means of oxygen

Country Status (3)

Country Link
EP (1) EP0524127B1 (en)
BR (1) BR9102464A (en)
MX (1) MX9202832A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69503238D1 (en) * 1994-04-28 1998-08-06 Mac Millan Bloedel Ltd BLEACHING OF CELLULAR WITH OXYGEN
AR091998A1 (en) 2012-05-03 2015-03-18 Annikki Gmbh CELLULOSE PREPARATION PROCEDURE WITH LIGNIN LOW CONCENTRATION
CN114908598B (en) * 2022-02-26 2022-12-09 北京林业大学 Oxygen bleaching method for paper pulp

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2189572A1 (en) * 1972-06-22 1974-01-25 Billeruds Ab Bleaching alkaline cellulosic pulp with oxygen - in presence of formaldehyde, (m)ethanol isopropanol, glycerol, sorbitol etc, to ensure slow disintegration of cellulose

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1440995A1 (en) * 1987-01-04 1988-11-30 Ленинградская лесотехническая академия им.С.М.Кирова Method of producing semifinished pulp product

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2189572A1 (en) * 1972-06-22 1974-01-25 Billeruds Ab Bleaching alkaline cellulosic pulp with oxygen - in presence of formaldehyde, (m)ethanol isopropanol, glycerol, sorbitol etc, to ensure slow disintegration of cellulose

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
ABSTRACT BULLETIN OF THE INSTITUTE OF PAPER CHEMISTRY vol. 59, no. 3, September 1988, APPLETON US page 308 REGLA, H. ET AL. 'Effect of methanol in oxygen bleaching.' *
DATABASE WPIL Section Ch, Week 8936, Derwent Publications Ltd., London, GB; Class E36, AN 89-261684 & SU-A-1 440 995 (LENINGRAD FORESTRY ACAD.) 30 November 1988 *

Also Published As

Publication number Publication date
EP0524127A2 (en) 1993-01-20
EP0524127B1 (en) 1996-08-14
MX9202832A (en) 1993-02-01
BR9102464A (en) 1993-01-12

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