ZA912117B - Extended kraft cooking with white liquor added to wash circulation - Google Patents

Extended kraft cooking with white liquor added to wash circulation

Info

Publication number
ZA912117B
ZA912117B ZA912117A ZA912117A ZA912117B ZA 912117 B ZA912117 B ZA 912117B ZA 912117 A ZA912117 A ZA 912117A ZA 912117 A ZA912117 A ZA 912117A ZA 912117 B ZA912117 B ZA 912117B
Authority
ZA
South Africa
Prior art keywords
white liquor
kraft
wash
digester
kraft cooking
Prior art date
Application number
ZA912117A
Inventor
Bertil Stromberg
Stromberg Bertil
Richard Laakso
Laakso Richard
Brian Greenwood
Greenwood Brian
Jian Jiang
Jiang Jian
Joseph Phillips
Phillips Joseph
James Robert Prough
Robert Prough James
Original Assignee
Kamyr Inc
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 Kamyr Inc filed Critical Kamyr Inc
Publication of ZA912117B publication Critical patent/ZA912117B/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
    • 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

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>
ZA912117A 1990-09-17 1991-03-21 Extended kraft cooking with white liquor added to wash circulation ZA912117B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US58304390A 1990-09-17 1990-09-17

Publications (1)

Publication Number Publication Date
ZA912117B true ZA912117B (en) 1991-11-27

Family

ID=24331461

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA912117A ZA912117B (en) 1990-09-17 1991-03-21 Extended kraft cooking with white liquor added to wash circulation

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) FI103815B (en)
NO (1) NO179918C (en)
RU (1) RU2089694C1 (en)
ZA (1) ZA912117B (en)

Families Citing this family (21)

* Cited by examiner, † Cited by third party
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
US5824188A (en) * 1993-05-04 1998-10-20 Ahlstrom Machinery Inc. Method of controlling the pressure of a continuous digester using an extraction-dilution
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
US6132556A (en) * 1993-05-04 2000-10-17 Andritz-Ahlstrom Inc. Method of controlling pulp digester pressure via liquor extraction
SE502667C2 (en) * 1993-07-12 1995-12-04 Kvaerner Pulping Tech Treatment of fiber material with complexing agents before cooking
AU2697295A (en) * 1994-09-02 1996-03-27 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.
SE0004049L (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
US20090038767A1 (en) * 2007-08-07 2009-02-12 Andritz Inc. Method and System for Semi-Chemical Pulping
CA2638196C (en) 2007-08-07 2015-12-15 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)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
JP3029492B2 (en) 2000-04-04
ATE146538T1 (en) 1997-01-15
EP0476230A3 (en) 1993-06-09
NO179918B (en) 1996-09-30
JPH04300378A (en) 1992-10-23
EP0476230A2 (en) 1992-03-25
CA2037717C (en) 1996-03-05
FI914353A (en) 1992-03-18
AU647129B2 (en) 1994-03-17
EP0476230B1 (en) 1996-12-18
FI103815B1 (en) 1999-09-30
DE69123670D1 (en) 1997-01-30
FI103815B (en) 1999-09-30
FI914353A0 (en) 1991-09-17
NO913639L (en) 1992-03-18
AU7830591A (en) 1992-03-19
NO913639D0 (en) 1991-09-16
RU2089694C1 (en) 1997-09-10
CA2037717A1 (en) 1992-03-18
BR9103650A (en) 1992-05-19
NO179918C (en) 1997-01-08

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