SE9101587D0 - PROCEDURES FOR PREPARING CHEMICAL MECHANICAL MASS - Google Patents
PROCEDURES FOR PREPARING CHEMICAL MECHANICAL MASSInfo
- Publication number
- SE9101587D0 SE9101587D0 SE9101587A SE9101587A SE9101587D0 SE 9101587 D0 SE9101587 D0 SE 9101587D0 SE 9101587 A SE9101587 A SE 9101587A SE 9101587 A SE9101587 A SE 9101587A SE 9101587 D0 SE9101587 D0 SE 9101587D0
- Authority
- SE
- Sweden
- Prior art keywords
- impregnating
- pulp
- procedures
- chemical mechanical
- preheating
- Prior art date
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
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.
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 |
CA002109513A CA2109513A1 (en) | 1991-05-24 | 1992-05-22 | A method for the manufacture of chemithermomechanical pulp |
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 |
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 |
NO934229A NO934229L (en) | 1991-05-24 | 1993-11-23 | Procedure for Preparation of Chemical Thermomechanical Pulp |
FI935205A FI935205A (en) | 1991-05-24 | 1993-11-23 | FOERFARANDE FOER FRAMSTAELLNING AV KEMITERMOMEKANISK MASSA |
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 true SE9101587D0 (en) | 1991-05-24 |
SE9101587L 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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997022749A1 (en) * | 1995-12-19 | 1997-06-26 | 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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2615874B1 (en) * | 1987-05-25 | 1992-02-21 | Atochem | PROCESS FOR THE PREPARATION OF CHEMICOTHERMOMECHANICAL PASTES |
-
1991
- 1991-05-24 SE SE9101587A patent/SE468644B/en not_active IP Right Cessation
-
1992
- 1992-05-22 AU AU18824/92A patent/AU1882492A/en not_active Abandoned
- 1992-05-22 CA CA002109513A patent/CA2109513A1/en not_active Abandoned
- 1992-05-22 WO PCT/SE1992/000348 patent/WO1992020855A1/en active Application Filing
- 1992-05-22 NZ NZ24286892A patent/NZ242868A/en unknown
-
1993
- 1993-11-23 NO NO934229A patent/NO934229L/en unknown
- 1993-11-23 FI FI935205A patent/FI935205A/en unknown
Also Published As
Publication number | Publication date |
---|---|
FI935205A0 (en) | 1993-11-23 |
CA2109513A1 (en) | 1992-11-25 |
WO1992020855A1 (en) | 1992-11-26 |
NO934229D0 (en) | 1993-11-23 |
AU1882492A (en) | 1992-12-30 |
SE468644B (en) | 1993-02-22 |
NO934229L (en) | 1993-11-23 |
NZ242868A (en) | 1994-11-25 |
SE9101587L (en) | 1992-11-25 |
FI935205A (en) | 1993-11-23 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
NUG | Patent has lapsed |