ATE48291T1 - PROCESS FOR BLEACHING CHEMICAL WOOD PULP. - Google Patents

PROCESS FOR BLEACHING CHEMICAL WOOD PULP.

Info

Publication number
ATE48291T1
ATE48291T1 AT86420266T AT86420266T ATE48291T1 AT E48291 T1 ATE48291 T1 AT E48291T1 AT 86420266 T AT86420266 T AT 86420266T AT 86420266 T AT86420266 T AT 86420266T AT E48291 T1 ATE48291 T1 AT E48291T1
Authority
AT
Austria
Prior art keywords
pulp
alkaline extraction
treatment
wood pulp
bleaching chemical
Prior art date
Application number
AT86420266T
Other languages
German (de)
Inventor
Lucien Bourson
Original Assignee
Atochem
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=9324477&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=ATE48291(T1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Atochem filed Critical Atochem
Application granted granted Critical
Publication of ATE48291T1 publication Critical patent/ATE48291T1/en

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
    • D21C9/1026—Other features in bleaching processes

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
  • Detergent Compositions (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)

Abstract

1. Process for bleaching chemical papermaking pulps in a bleaching sequence including, in succession, a treatment of the pulp by means of chlorine and chlorine dioxide acting in a single bath, a first alkaline extraction by means of sodium hydroxide, a treatment of the pulp by means of chlorine dioxide, a second alkaline extraction by means of sodium hydroxide and again a treatment of the pulp by means of chlorine dioxide, characterized in that the pulp is subjected at the same time to the action of oxygen during the first alkaline extraction and to the action of hydrogen peroxide during the second alkaline extraction.
AT86420266T 1985-10-30 1986-10-28 PROCESS FOR BLEACHING CHEMICAL WOOD PULP. ATE48291T1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8516332A FR2589494B1 (en) 1985-10-30 1985-10-30 PROCESS FOR BLEACHING CHEMICAL PAPER PULP
EP86420266A EP0222674B1 (en) 1985-10-30 1986-10-28 Process for bleaching chemical wood pulps

Publications (1)

Publication Number Publication Date
ATE48291T1 true ATE48291T1 (en) 1989-12-15

Family

ID=9324477

Family Applications (1)

Application Number Title Priority Date Filing Date
AT86420266T ATE48291T1 (en) 1985-10-30 1986-10-28 PROCESS FOR BLEACHING CHEMICAL WOOD PULP.

Country Status (11)

Country Link
EP (1) EP0222674B1 (en)
JP (1) JPS62141188A (en)
AT (1) ATE48291T1 (en)
AU (1) AU603556B2 (en)
DE (2) DE222674T1 (en)
ES (1) ES2000019B3 (en)
FI (1) FI85294B (en)
FR (1) FR2589494B1 (en)
NO (1) NO864319L (en)
PT (1) PT83649B (en)
ZA (1) ZA868275B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4031597A1 (en) * 1990-10-05 1992-04-09 Sueddeutsche Kalkstickstoff METHOD FOR LOW-CHLORINE BLEACHING AND DELIGNIFICATION OF CELLULAR
US6569284B1 (en) * 1996-09-24 2003-05-27 International Paper Company Elemental-chlorine-free bleaching process having an initial Eo or Eop stage
FR3062138B1 (en) 2017-01-23 2019-06-07 Centre Technique De L'industrie Des Papiers, Cartons Et Celluloses PROCESS FOR WHITENING A PAPER PULP

Also Published As

Publication number Publication date
ES2000019A4 (en) 1987-09-16
FI85294B (en) 1991-12-13
DE222674T1 (en) 1987-10-15
ZA868275B (en) 1987-06-24
FI864411A0 (en) 1986-10-29
EP0222674B1 (en) 1989-11-29
FI864411A (en) 1987-05-01
DE3667184D1 (en) 1990-01-04
FR2589494A1 (en) 1987-05-07
ES2000019B3 (en) 1990-03-16
FR2589494B1 (en) 1988-07-29
EP0222674A1 (en) 1987-05-20
JPS62141188A (en) 1987-06-24
AU603556B2 (en) 1990-11-22
JPH0116958B2 (en) 1989-03-28
PT83649A (en) 1986-11-01
NO864319D0 (en) 1986-10-29
NO864319L (en) 1987-05-04
PT83649B (en) 1989-05-31
AU6449286A (en) 1987-05-07

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Legal Events

Date Code Title Description
UEP Publication of translation of european patent specification
RZN Patent revoked