DE3563548D1 - Process for preparing chemical wood pulps with a view to bleaching - Google Patents

Process for preparing chemical wood pulps with a view to bleaching

Info

Publication number
DE3563548D1
DE3563548D1 DE8585420187T DE3563548T DE3563548D1 DE 3563548 D1 DE3563548 D1 DE 3563548D1 DE 8585420187 T DE8585420187 T DE 8585420187T DE 3563548 T DE3563548 T DE 3563548T DE 3563548 D1 DE3563548 D1 DE 3563548D1
Authority
DE
Germany
Prior art keywords
bleaching
view
preparing chemical
wood pulps
chemical wood
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.)
Expired
Application number
DE8585420187T
Other languages
German (de)
Inventor
Dominique Lachenal
Choudens Christian De
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.)
Arkema France SA
Centre Technique de lIndustrie des Papiers Cartons et Celluloses
Original Assignee
Atochem SA
Centre Technique de lIndustrie des Papiers Cartons et Celluloses
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=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=DE3563548(D1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Atochem SA, Centre Technique de lIndustrie des Papiers Cartons et Celluloses filed Critical Atochem SA
Application granted granted Critical
Publication of DE3563548D1 publication Critical patent/DE3563548D1/en
Expired 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
    • D21C9/12—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)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Nitrogen Condensed Heterocyclic Rings (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (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.
DE8585420187T 1984-10-25 1985-10-22 Process for preparing chemical wood pulps with a view to bleaching Expired DE3563548D1 (en)

Applications Claiming Priority (1)

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.

Publications (1)

Publication Number Publication Date
DE3563548D1 true DE3563548D1 (en) 1988-08-04

Family

ID=9309092

Family Applications (2)

Application Number Title Priority Date Filing Date
DE198585420187T Pending DE180529T1 (en) 1984-10-25 1985-10-22 METHOD FOR PROVIDING CHEMICAL WOOD PULPS WITH REGARD TO THE BLEACHES.
DE8585420187T Expired DE3563548D1 (en) 1984-10-25 1985-10-22 Process for preparing chemical wood pulps with a view to bleaching

Family Applications Before (1)

Application Number Title Priority Date Filing Date
DE198585420187T Pending DE180529T1 (en) 1984-10-25 1985-10-22 METHOD FOR PROVIDING CHEMICAL WOOD PULPS WITH REGARD TO THE BLEACHES.

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
EP0180529B2 (en) 1992-04-08
ES8606557A1 (en) 1986-04-01
ES548166A0 (en) 1986-04-01
FI854148A0 (en) 1985-10-23
EP0180529B1 (en) 1988-06-29
FR2572431A1 (en) 1986-05-02
FI854148L (en) 1986-04-26
EP0180529A1 (en) 1986-05-07
DE180529T1 (en) 1986-12-18
CA1273755A (en) 1990-09-11
FI82726B (en) 1990-12-31
AU576394B2 (en) 1988-08-25
ATE35433T1 (en) 1988-07-15
FR2572431B1 (en) 1987-12-04
JPS61102495A (en) 1986-05-21
AU4910885A (en) 1986-05-29
FI82726C (en) 1991-04-10

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DE3563548D1 (en) Process for preparing chemical wood pulps with a view to bleaching
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Legal Events

Date Code Title Description
8363 Opposition against the patent
8366 Restricted maintained after opposition proceedings
8339 Ceased/non-payment of the annual fee