PT83649A - PROCESS FOR WHITENING CHEMICAL PAPER PULP - Google Patents

PROCESS FOR WHITENING CHEMICAL PAPER PULP

Info

Publication number
PT83649A
PT83649A PT83649A PT8364986A PT83649A PT 83649 A PT83649 A PT 83649A PT 83649 A PT83649 A PT 83649A PT 8364986 A PT8364986 A PT 8364986A PT 83649 A PT83649 A PT 83649A
Authority
PT
Portugal
Prior art keywords
pulp
alkaline extraction
treatment
paper pulp
chlorine dioxide
Prior art date
Application number
PT83649A
Other languages
French (fr)
Portuguese (pt)
Other versions
PT83649B (en
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=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=PT83649(A) "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
Publication of PT83649A publication Critical patent/PT83649A/en
Publication of PT83649B publication Critical patent/PT83649B/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.
PT83649A 1985-10-30 1986-10-29 PROCESS FOR THE WHITING OF QIMICAS PAPER PASTES PT83649B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8516332A FR2589494B1 (en) 1985-10-30 1985-10-30 PROCESS FOR BLEACHING CHEMICAL PAPER PULP

Publications (2)

Publication Number Publication Date
PT83649A true PT83649A (en) 1986-11-01
PT83649B PT83649B (en) 1989-05-31

Family

ID=9324477

Family Applications (1)

Application Number Title Priority Date Filing Date
PT83649A PT83649B (en) 1985-10-30 1986-10-29 PROCESS FOR THE WHITING OF QIMICAS PAPER PASTES

Country Status (11)

Country Link
EP (1) EP0222674B1 (en)
JP (1) JPS62141188A (en)
AT (1) ATE48291T1 (en)
AU (1) AU603556B2 (en)
DE (2) DE3667184D1 (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
EP0222674B1 (en) 1989-11-29
PT83649B (en) 1989-05-31
DE222674T1 (en) 1987-10-15
AU6449286A (en) 1987-05-07
EP0222674A1 (en) 1987-05-20
JPS62141188A (en) 1987-06-24
ES2000019B3 (en) 1990-03-16
NO864319D0 (en) 1986-10-29
FR2589494A1 (en) 1987-05-07
JPH0116958B2 (en) 1989-03-28
FI864411A (en) 1987-05-01
AU603556B2 (en) 1990-11-22
NO864319L (en) 1987-05-04
DE3667184D1 (en) 1990-01-04
FR2589494B1 (en) 1988-07-29
FI864411A0 (en) 1986-10-29
ZA868275B (en) 1987-06-24
ATE48291T1 (en) 1989-12-15
ES2000019A4 (en) 1987-09-16
FI85294B (en) 1991-12-13

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Legal Events

Date Code Title Description
MM3A Annulment or lapse

Free format text: LAPSE DUE TO NON-PAYMENT OF FEES

Effective date: 19940531