DE69123670D1 - Prolonged power boiling with white liquor added to the washing cycle - Google Patents

Prolonged power boiling with white liquor added to the washing cycle

Info

Publication number
DE69123670D1
DE69123670D1 DE69123670T DE69123670T DE69123670D1 DE 69123670 D1 DE69123670 D1 DE 69123670D1 DE 69123670 T DE69123670 T DE 69123670T DE 69123670 T DE69123670 T DE 69123670T DE 69123670 D1 DE69123670 D1 DE 69123670D1
Authority
DE
Germany
Prior art keywords
white liquor
kraft
digester
wash
washing cycle
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
DE69123670T
Other languages
German (de)
Inventor
Bertil Stromberg
Jian Jiang
Richard Laakso
Joseph Phillips
Brian Greenwood
James Prough
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kamyr Inc
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
Application granted granted Critical
Publication of DE69123670D1 publication Critical patent/DE69123670D1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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)
  • Detergent Compositions (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Diaphragms For Electromechanical Transducers (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>
DE69123670T 1990-09-17 1991-05-22 Prolonged power boiling with white liquor added to the washing cycle Expired - Lifetime DE69123670D1 (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
DE69123670D1 true DE69123670D1 (en) 1997-01-30

Family

ID=24331461

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69123670T Expired - Lifetime DE69123670D1 (en) 1990-09-17 1991-05-22 Prolonged power boiling with white liquor added to the washing cycle

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 (25)

* 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
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
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
US5824188A (en) * 1993-05-04 1998-10-20 Ahlstrom Machinery Inc. Method of controlling the pressure of a continuous digester using an extraction-dilution
US5536366A (en) * 1993-05-04 1996-07-16 Ahlstrom Machinery Inc. Digester system for implementing low dissolved solids profiling
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.
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
GB0119237D0 (en) * 2001-08-07 2001-10-03 Bioregional Minimills Uk Ltd Paper plant
RU2407768C2 (en) * 2005-06-03 2010-12-27 Андриц Аг Method to reduce power consumption in production of thermomechanical wood pulp by means of low-temperature grinding of wood pulp of low and medium concentration
RU2335590C1 (en) * 2007-01-16 2008-10-10 Витаутас Валентинович Сенкус Method of manufacture of stable railway sleeper with application of mining and smelting production wastes
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
US7828930B2 (en) * 2007-11-20 2010-11-09 International Paper Company Use of polysulfide in modified cooking
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
NO913639D0 (en) 1991-09-16
FI103815B1 (en) 1999-09-30
CA2037717A1 (en) 1992-03-18
AU7830591A (en) 1992-03-19
ATE146538T1 (en) 1997-01-15
CA2037717C (en) 1996-03-05
ZA912117B (en) 1991-11-27
FI103815B (en) 1999-09-30
BR9103650A (en) 1992-05-19
EP0476230A2 (en) 1992-03-25
EP0476230B1 (en) 1996-12-18
EP0476230A3 (en) 1993-06-09
AU647129B2 (en) 1994-03-17
FI914353A7 (en) 1992-03-18
NO913639L (en) 1992-03-18
NO179918C (en) 1997-01-08
JPH04300378A (en) 1992-10-23
RU2089694C1 (en) 1997-09-10
NO179918B (en) 1996-09-30
FI914353A0 (en) 1991-09-17

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Legal Events

Date Code Title Description
8332 No legal effect for de