SE9603415D0 - Process for producing high yield cellulose pulp - Google Patents

Process for producing high yield cellulose pulp

Info

Publication number
SE9603415D0
SE9603415D0 SE9603415A SE9603415A SE9603415D0 SE 9603415 D0 SE9603415 D0 SE 9603415D0 SE 9603415 A SE9603415 A SE 9603415A SE 9603415 A SE9603415 A SE 9603415A SE 9603415 D0 SE9603415 D0 SE 9603415D0
Authority
SE
Sweden
Prior art keywords
cooking
flow
zone
counter
cellulose pulp
Prior art date
Application number
SE9603415A
Other languages
Swedish (sv)
Other versions
SE9603415L (en
Inventor
Lars Stigsson
Soeren Gustafsson
Original Assignee
Kvaerner Pulping Tech
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 Kvaerner Pulping Tech filed Critical Kvaerner Pulping Tech
Priority to SE9603415A priority Critical patent/SE9603415L/en
Publication of SE9603415D0 publication Critical patent/SE9603415D0/en
Publication of SE9603415L publication Critical patent/SE9603415L/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
    • D21C1/00—Pretreatment of the finely-divided materials before digesting
    • D21C1/06—Pretreatment of the finely-divided materials before digesting with alkaline reacting compounds
    • 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
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/02—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate 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
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/22—Other features of pulping processes
    • D21C3/24—Continuous processes

Landscapes

  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Paper (AREA)

Abstract

Method for the preparation of cellulose pulp comprises a pre-treatment step with an impregnation liquid containing hydrogen sulphide and/or sodium bisulphide, carried out in an impregnation zone at 100-160 deg. C, pressure greater than 3 atmospheres and a pH of 5-10, followed by an alkali cooking step.The impregnation liquid comprises filtrate from the bleaching plant or leftover acid from chlorine dioxide processing. The cooking step contains a cooking zone with unidirectional flow and at least one cooking zone with a counter-flow. Cooking temperature is 165 deg. C for coniferous wood and 155 deg. C for deciduous wood. The temperature in the final counter-flow cooking zone is the same as the highest temperature in the cooking step. Dwell time in the counter-flow cooking zone is >30 minutes.
SE9603415A 1996-09-19 1996-09-19 Process for producing high yield cellulose pulp SE9603415L (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SE9603415A SE9603415L (en) 1996-09-19 1996-09-19 Process for producing high yield cellulose pulp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9603415A SE9603415L (en) 1996-09-19 1996-09-19 Process for producing high yield cellulose pulp

Publications (2)

Publication Number Publication Date
SE9603415D0 true SE9603415D0 (en) 1996-09-19
SE9603415L SE9603415L (en) 1998-03-20

Family

ID=20403941

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9603415A SE9603415L (en) 1996-09-19 1996-09-19 Process for producing high yield cellulose pulp

Country Status (1)

Country Link
SE (1) SE9603415L (en)

Also Published As

Publication number Publication date
SE9603415L (en) 1998-03-20

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Legal Events

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