SE9101587L - PREPARATION OF CHEMISTRY MECHANICAL MASS AND IMPROVEMENT SOLUTION CONTAINING BORHYDRIDE AND SULPHITE - Google Patents

PREPARATION OF CHEMISTRY MECHANICAL MASS AND IMPROVEMENT SOLUTION CONTAINING BORHYDRIDE AND SULPHITE

Info

Publication number
SE9101587L
SE9101587L SE9101587A SE9101587A SE9101587L SE 9101587 L SE9101587 L SE 9101587L SE 9101587 A SE9101587 A SE 9101587A SE 9101587 A SE9101587 A SE 9101587A SE 9101587 L SE9101587 L SE 9101587L
Authority
SE
Sweden
Prior art keywords
impregnating
sulphite
borhydride
preparation
solution containing
Prior art date
Application number
SE9101587A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE9101587D0 (en
SE468644B (en
Inventor
B Falk
T Granfeldt
Original Assignee
Sunds Defibrator Ind Ab
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 Sunds Defibrator Ind Ab filed Critical Sunds Defibrator Ind Ab
Priority to SE9101587A priority Critical patent/SE468644B/en
Publication of SE9101587D0 publication Critical patent/SE9101587D0/en
Priority to NZ24286892A priority patent/NZ242868A/en
Priority to CA002109513A priority patent/CA2109513A1/en
Priority to PCT/SE1992/000348 priority patent/WO1992020855A1/en
Priority to AU18824/92A priority patent/AU1882492A/en
Publication of SE9101587L publication Critical patent/SE9101587L/en
Publication of SE468644B publication Critical patent/SE468644B/en
Priority to FI935205A priority patent/FI935205A/en
Priority to NO934229A priority patent/NO934229L/en

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/02—Pretreatment of the raw materials by chemical or physical means
    • D21B1/021—Pretreatment of the raw materials by chemical or physical means by chemical means
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/14—Disintegrating in mills
    • D21B1/16—Disintegrating in mills in the presence of chemical agents

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)

Abstract

A method for producing chemithermomechanical pulp from lignocellulosic material, by preheating and refining the material at an elevated temperature of 160-180 DEG C, subsequent to pre-impregnating the chips with an impregnating liquid that contains borohydride, at least one compound chosen from the group sodium sulphite, sodium hydrosulphite and sodium disulphite, and optionally one or more sequestering agents. The impregnating liquid preferably has a neutral, near neutral or slightly acid pH. The inventive method enables pulp discoloration to be avoided and/or a reduction in pulp brightness to be counteracted in the preheating and refining processes. The invention also relates to an impregnating liquid for impregnating lignocellulosic material in the production of chemithermomechanical pulps.
SE9101587A 1991-05-24 1991-05-24 PREPARATION OF CHEMISTRY MECHANICAL MASS AND IMPROVEMENT SOLUTION CONTAINING BORHYDRIDE AND SULPHITE SE468644B (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
SE9101587A SE468644B (en) 1991-05-24 1991-05-24 PREPARATION OF CHEMISTRY MECHANICAL MASS AND IMPROVEMENT SOLUTION CONTAINING BORHYDRIDE AND SULPHITE
NZ24286892A NZ242868A (en) 1991-05-24 1992-05-22 Production of chemithermomechanical pulp involving a preheating of impregnated chips, the impregnating composition comprising borohydride and sulphite and being slightly acid (ph 5-7); impregnating liquid therefor
CA002109513A CA2109513A1 (en) 1991-05-24 1992-05-22 A method for the manufacture of chemithermomechanical pulp
PCT/SE1992/000348 WO1992020855A1 (en) 1991-05-24 1992-05-22 A method for the manufacture of chemithermomechanical pulp
AU18824/92A AU1882492A (en) 1991-05-24 1992-05-22 A method for the manufacture of chemithermomechanical pulp
FI935205A FI935205A (en) 1991-05-24 1993-11-23 FOERFARANDE FOER FRAMSTAELLNING AV KEMITERMOMEKANISK MASSA
NO934229A NO934229L (en) 1991-05-24 1993-11-23 Procedure for Preparation of Chemical Thermomechanical Pulp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9101587A SE468644B (en) 1991-05-24 1991-05-24 PREPARATION OF CHEMISTRY MECHANICAL MASS AND IMPROVEMENT SOLUTION CONTAINING BORHYDRIDE AND SULPHITE

Publications (3)

Publication Number Publication Date
SE9101587D0 SE9101587D0 (en) 1991-05-24
SE9101587L true SE9101587L (en) 1992-11-25
SE468644B SE468644B (en) 1993-02-22

Family

ID=20382840

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9101587A SE468644B (en) 1991-05-24 1991-05-24 PREPARATION OF CHEMISTRY MECHANICAL MASS AND IMPROVEMENT SOLUTION CONTAINING BORHYDRIDE AND SULPHITE

Country Status (7)

Country Link
AU (1) AU1882492A (en)
CA (1) CA2109513A1 (en)
FI (1) FI935205A (en)
NO (1) NO934229L (en)
NZ (1) NZ242868A (en)
SE (1) SE468644B (en)
WO (1) WO1992020855A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU4271596A (en) * 1995-12-19 1997-07-14 Kvaerner Hymac Inc. Process for treating refiner pulp
SE525872C2 (en) * 2002-09-06 2005-05-17 Stora Enso Ab Method of producing mechanical pulp with reduced energy consumption
FI121114B (en) 2007-05-04 2010-07-15 Kemira Oyj Process for the preparation of dithionite
EP2348154A1 (en) * 2010-01-22 2011-07-27 Andritz AG Method for manufacturing wooden material
EP2924166A1 (en) * 2014-03-25 2015-09-30 Basf Se Method for the manufacture of bleached wood fibre

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2615874B1 (en) * 1987-05-25 1992-02-21 Atochem PROCESS FOR THE PREPARATION OF CHEMICOTHERMOMECHANICAL PASTES

Also Published As

Publication number Publication date
NZ242868A (en) 1994-11-25
NO934229D0 (en) 1993-11-23
NO934229L (en) 1993-11-23
SE9101587D0 (en) 1991-05-24
CA2109513A1 (en) 1992-11-25
SE468644B (en) 1993-02-22
AU1882492A (en) 1992-12-30
WO1992020855A1 (en) 1992-11-26
FI935205A0 (en) 1993-11-23
FI935205A (en) 1993-11-23

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Legal Events

Date Code Title Description
NUG Patent has lapsed