NO913639L - PROCEDURE FOR PREPARATION OF POWER MASS. - Google Patents
PROCEDURE FOR PREPARATION OF POWER MASS.Info
- Publication number
- NO913639L NO913639L NO91913639A NO913639A NO913639L NO 913639 L NO913639 L NO 913639L NO 91913639 A NO91913639 A NO 91913639A NO 913639 A NO913639 A NO 913639A NO 913639 L NO913639 L NO 913639L
- Authority
- NO
- Norway
- Prior art keywords
- white liquor
- kraft
- digester
- wash
- central portion
- Prior art date
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
- D21C9/147—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications
-
- 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
-
- 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
- D21C7/00—Digesters
-
- 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
- D21C9/147—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications
- D21C9/153—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications with ozone
-
- 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
- D21C9/16—Bleaching ; Apparatus therefor with per compounds
- D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Paper (AREA)
- Cookers (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Detergent Compositions (AREA)
- Nitrogen Condensed Heterocyclic Rings (AREA)
- Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
Abstract
In the continuous kraft pulping of comminuted cellulosic fibrous material (e.g. wood chips) to produce paper pulp, viscosity for a given Kappa Number is significantly increased (e.g. at least about 20%) by adding kraft white liquor to the wash recirculation loop (38-40) in a continuous digester (19). Optimum results are obtained when kraft white liquor is also added to a recirculation loop (28-30) at a central portion of the digester, so that the majority of the digester has countercurrent flow between white liquor and cellulosic material. About 5-20% of the total white liquor necessary to effect kraft cooking is introduced in the wash circulation, and about 10-20% is introduced into the central portion recirculation. The temperature in the wash zone is maintained at about 140-175 DEG C. <IMAGE>
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US58304390A | 1990-09-17 | 1990-09-17 |
Publications (4)
Publication Number | Publication Date |
---|---|
NO913639D0 NO913639D0 (en) | 1991-09-16 |
NO913639L true NO913639L (en) | 1992-03-18 |
NO179918B NO179918B (en) | 1996-09-30 |
NO179918C NO179918C (en) | 1997-01-08 |
Family
ID=24331461
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NO913639A NO179918C (en) | 1990-09-17 | 1991-09-16 | Process and apparatus for producing power mass |
Country Status (10)
Country | Link |
---|---|
EP (1) | EP0476230B1 (en) |
JP (1) | JP3029492B2 (en) |
AT (1) | ATE146538T1 (en) |
BR (1) | BR9103650A (en) |
CA (1) | CA2037717C (en) |
DE (1) | DE69123670D1 (en) |
FI (1) | FI103815B1 (en) |
NO (1) | NO179918C (en) |
RU (1) | RU2089694C1 (en) |
ZA (1) | ZA912117B (en) |
Families Citing this family (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA2089516A1 (en) * | 1992-02-21 | 1993-08-22 | Kaj Henricson | Chlorine free pulping and bleaching sequence |
US5401361A (en) * | 1992-08-19 | 1995-03-28 | Kamyr, Inc. | Completely coutercurrent cook continuous digester |
SE500455C2 (en) * | 1992-11-18 | 1994-06-27 | Kamyr Ab | Method of continuous cooking under elevated pressure and temperature of fiber material in a vertical digester |
SE501848C2 (en) * | 1992-11-18 | 1995-06-06 | Kvaerner Pulping Tech | Method to cook pulp continuously at constant temperature |
WO1994024362A1 (en) * | 1993-04-20 | 1994-10-27 | Kamyr Ab | Method of continuously cooking pulp |
US5766413A (en) * | 1993-04-23 | 1998-06-16 | Kvaerner Pulping Ab | Process for isothermal cooking pulp in a continuous digester |
US5536366A (en) * | 1993-05-04 | 1996-07-16 | Ahlstrom Machinery Inc. | Digester system for implementing low dissolved solids profiling |
US5489363A (en) | 1993-05-04 | 1996-02-06 | Kamyr, Inc. | Pulping with low dissolved solids for improved pulp strength |
US6132556A (en) * | 1993-05-04 | 2000-10-17 | Andritz-Ahlstrom Inc. | Method of controlling pulp digester pressure via liquor extraction |
US5575890A (en) * | 1993-05-04 | 1996-11-19 | Kamyr, Inc. | Method for selectively increasing the sulfide ion concentration and sulfidity of kraft cooking liquor during kraft cooking of wood |
US5824188A (en) * | 1993-05-04 | 1998-10-20 | Ahlstrom Machinery Inc. | Method of controlling the pressure of a continuous digester using an extraction-dilution |
SE502667C2 (en) * | 1993-07-12 | 1995-12-04 | Kvaerner Pulping Tech | Treatment of fiber material with complexing agents before cooking |
WO1996007786A1 (en) * | 1994-09-02 | 1996-03-14 | Kamyr, Inc. | Continuous kraft cooking with black liquor pretreatment |
SE506458C2 (en) | 1996-02-09 | 1997-12-15 | Kvaerner Pulping Tech | Continuous boiling of cellulosic material with heat exchange between boiler extraction and circulating boiling liquid |
BE1011503A3 (en) * | 1997-10-17 | 1999-10-05 | Solvay Interox | Manufacturing pulp chemicals. |
SE515970C2 (en) * | 2000-11-03 | 2001-11-05 | Kvaerner Pulping Tech | Continuous boiling of pulp less used cooking liquor partly from the digester and partly from a subsequent pressure diffuser |
SE518542C2 (en) * | 2001-03-21 | 2002-10-22 | Kvaerner Pulping Tech | Continuous boiler method for operating a continuous boiler and boiler liquid return system in a continuous boiler |
SE517674E8 (en) * | 2001-05-02 | 2015-10-20 | Metso Paper Sweden Ab | Method of washing liquid supply to boiling process for cellulose pulp |
CA2638196C (en) | 2007-08-07 | 2015-12-15 | Andritz Inc. | Method and system for semi-chemical pulping |
US20090038767A1 (en) * | 2007-08-07 | 2009-02-12 | Andritz Inc. | Method and System for Semi-Chemical Pulping |
SE539706C2 (en) * | 2014-11-07 | 2017-11-07 | Valmet Oy | Method for recovering hydrolysate |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3215588A (en) * | 1963-08-15 | 1965-11-02 | Lummus Co | Continuous impregnation, cooking, and washing of fibrous material |
US3427218A (en) * | 1964-07-10 | 1969-02-11 | Kamyr Ab | Method of performing counter-current continuous cellulose digestion |
US5053108A (en) * | 1989-06-28 | 1991-10-01 | Kamyr Ab | High sulfidity cook for paper pulp using black liquor sulfonization of steamed chips |
-
1991
- 1991-03-07 CA CA002037717A patent/CA2037717C/en not_active Expired - Lifetime
- 1991-03-21 ZA ZA912117A patent/ZA912117B/en unknown
- 1991-05-22 EP EP91108241A patent/EP0476230B1/en not_active Expired - Lifetime
- 1991-05-22 AT AT91108241T patent/ATE146538T1/en not_active IP Right Cessation
- 1991-05-22 DE DE69123670T patent/DE69123670D1/en not_active Expired - Lifetime
- 1991-08-26 BR BR919103650A patent/BR9103650A/en not_active IP Right Cessation
- 1991-09-10 JP JP3230501A patent/JP3029492B2/en not_active Expired - Lifetime
- 1991-09-16 RU SU915001635A patent/RU2089694C1/en active
- 1991-09-16 NO NO913639A patent/NO179918C/en not_active IP Right Cessation
- 1991-09-17 FI FI914353A patent/FI103815B1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
FI103815B (en) | 1999-09-30 |
NO179918C (en) | 1997-01-08 |
DE69123670D1 (en) | 1997-01-30 |
ATE146538T1 (en) | 1997-01-15 |
JPH04300378A (en) | 1992-10-23 |
JP3029492B2 (en) | 2000-04-04 |
RU2089694C1 (en) | 1997-09-10 |
NO913639D0 (en) | 1991-09-16 |
ZA912117B (en) | 1991-11-27 |
EP0476230A3 (en) | 1993-06-09 |
EP0476230B1 (en) | 1996-12-18 |
FI103815B1 (en) | 1999-09-30 |
CA2037717C (en) | 1996-03-05 |
AU7830591A (en) | 1992-03-19 |
NO179918B (en) | 1996-09-30 |
AU647129B2 (en) | 1994-03-17 |
FI914353A0 (en) | 1991-09-17 |
FI914353A (en) | 1992-03-18 |
CA2037717A1 (en) | 1992-03-18 |
BR9103650A (en) | 1992-05-19 |
EP0476230A2 (en) | 1992-03-25 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
MK1K | Patent expired |