ATE35433T1 - METHODS OF PREPARING CHEMICAL WOOD PULP FOR BLEACHING. - Google Patents

METHODS OF PREPARING CHEMICAL WOOD PULP FOR BLEACHING.

Info

Publication number
ATE35433T1
ATE35433T1 AT85420187T AT85420187T ATE35433T1 AT E35433 T1 ATE35433 T1 AT E35433T1 AT 85420187 T AT85420187 T AT 85420187T AT 85420187 T AT85420187 T AT 85420187T AT E35433 T1 ATE35433 T1 AT E35433T1
Authority
AT
Austria
Prior art keywords
bleaching
methods
wood pulp
preparing chemical
chemical wood
Prior art date
Application number
AT85420187T
Other languages
German (de)
Inventor
Dominique Lachenal
Choudens Christian De
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=9309092&utm_source=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=ATE35433(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 ATE35433T1 publication Critical patent/ATE35433T1/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
    • D21C9/12—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds
    • D21C9/14—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites
    • D21C9/144—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites with ClO2/Cl2 and other bleaching agents in a multistage process

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Nitrogen Condensed Heterocyclic Rings (AREA)

Abstract

1. Process for preparing chemical paper pulps in order to bleach them, of the type in which the said pulp is treated with chlorine, then with at least one oxygen compound, characterized in that the pretreatment with chlorine is performed with a pulp having a consistency between 5 % and 15 %, at a temperature between 70 degrees C and 90 degrees C, with a chlorine concentration between 0.8 % and 1.5 % by weight with respect to the weight of the pulp.
AT85420187T 1984-10-25 1985-10-22 METHODS OF PREPARING CHEMICAL WOOD PULP FOR BLEACHING. ATE35433T1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8416518A FR2572431B1 (en) 1984-10-25 1984-10-25 PROCESS FOR THE PREPARATION OF CHEMICAL PAPER PULP FOR BLEACHING.
EP85420187A EP0180529B2 (en) 1984-10-25 1985-10-22 Process for preparing chemical wood pulps with a view to bleaching

Publications (1)

Publication Number Publication Date
ATE35433T1 true ATE35433T1 (en) 1988-07-15

Family

ID=9309092

Family Applications (1)

Application Number Title Priority Date Filing Date
AT85420187T ATE35433T1 (en) 1984-10-25 1985-10-22 METHODS OF PREPARING CHEMICAL WOOD PULP FOR BLEACHING.

Country Status (9)

Country Link
EP (1) EP0180529B2 (en)
JP (1) JPS61102495A (en)
AT (1) ATE35433T1 (en)
AU (1) AU576394B2 (en)
CA (1) CA1273755A (en)
DE (2) DE180529T1 (en)
ES (1) ES8606557A1 (en)
FI (1) FI82726C (en)
FR (1) FR2572431B1 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1544216A (en) * 1921-08-11 1925-06-30 Donald J Campbell Molding apparatus
GB1262655A (en) * 1968-09-20 1972-02-02 Canadian Ind Bleaching of wood pulp
JPS51102103A (en) * 1975-03-05 1976-09-09 Nippon Parupu Kogyo Kk Ryusanenhoparupuno hyohakuhoho
DE2538673C2 (en) * 1975-08-30 1986-01-16 Degussa Ag, 6000 Frankfurt Bleaching of cellulose with considerably reduced use of chlorine
US4402788A (en) * 1982-04-26 1983-09-06 Champion International Corporation Process for bleaching wood pulp with hydrogen peroxide

Also Published As

Publication number Publication date
FI82726C (en) 1991-04-10
ES548166A0 (en) 1986-04-01
EP0180529A1 (en) 1986-05-07
DE3563548D1 (en) 1988-08-04
EP0180529B2 (en) 1992-04-08
FI854148A0 (en) 1985-10-23
DE180529T1 (en) 1986-12-18
AU4910885A (en) 1986-05-29
FR2572431A1 (en) 1986-05-02
FR2572431B1 (en) 1987-12-04
JPS61102495A (en) 1986-05-21
FI82726B (en) 1990-12-31
ES8606557A1 (en) 1986-04-01
AU576394B2 (en) 1988-08-25
EP0180529B1 (en) 1988-06-29
CA1273755A (en) 1990-09-11
FI854148L (en) 1986-04-26

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Legal Events

Date Code Title Description
UEP Publication of translation of european patent specification
UEP Publication of translation of european patent specification
REN Ceased due to non-payment of the annual fee