SE0300089D0 - Continuous pulping processes and systems - Google Patents

Continuous pulping processes and systems

Info

Publication number
SE0300089D0
SE0300089D0 SE0300089A SE0300089A SE0300089D0 SE 0300089 D0 SE0300089 D0 SE 0300089D0 SE 0300089 A SE0300089 A SE 0300089A SE 0300089 A SE0300089 A SE 0300089A SE 0300089 D0 SE0300089 D0 SE 0300089D0
Authority
SE
Sweden
Prior art keywords
screen
liquor
digester
screen assembly
extracted
Prior art date
Application number
SE0300089A
Other languages
Swedish (sv)
Other versions
SE0300089L (en
Inventor
C Bertil Stromberg
Original Assignee
Andritz 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 Andritz Inc filed Critical Andritz Inc
Publication of SE0300089D0 publication Critical patent/SE0300089D0/en
Publication of SE0300089L publication Critical patent/SE0300089L/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
    • 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
    • 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
    • D21C7/00—Digesters
    • D21C7/08—Discharge devices
    • 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
    • D21C7/14—Means for circulating the lye

Abstract

A set of spaced apart screen assemblies are provided within a continuous kraft digester. Liquor is extracted from a first screen assembly of the set without recirculation of at least a portion of the extracted liquor into the digester above the first screen. In such a manner, the need for circulation flow below the first screen assembly of the set to the second screen assembly of the set is minimized, thereby also minimizing (if not eliminating entirely) the packing problems such flow may cause. The liquor extracted from the first screen assembly in the set could be reintroduced, however, into the digester at some other location in the cooking system (e.g., at a location just above the bottom screen). By employing the present invention, the distance between the first and second screen assemblies is greater than one digester diameter (D). In addition, the liquor discharge below the first screen assembly, to which the circulated liquor from the second screen assembly (plus added dilution liquor and heat, if desired) may be at a distance of less than one-half (½) of a digester diameter (D) below the first screen. A small upflow can thus be used to displace the liquor at the first screen assembly, with a relatively short upflow zone. Multiple sets of such first and second screen assemblies may also be provided within the digester along with other conventional screen assemblies to effect desired internal liquor flows.
SE0300089A 2002-01-16 2003-01-16 Continuous pulp preparation processes and systems SE0300089L (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US34836702P 2002-01-16 2002-01-16
US10/304,096 US20030131956A1 (en) 2002-01-16 2002-11-26 Continuous pulping processes and systems

Publications (2)

Publication Number Publication Date
SE0300089D0 true SE0300089D0 (en) 2003-01-16
SE0300089L SE0300089L (en) 2003-07-17

Family

ID=26973808

Family Applications (1)

Application Number Title Priority Date Filing Date
SE0300089A SE0300089L (en) 2002-01-16 2003-01-16 Continuous pulp preparation processes and systems

Country Status (5)

Country Link
US (1) US20030131956A1 (en)
JP (1) JP2003213581A (en)
CA (1) CA2414070A1 (en)
FI (1) FI20030043A (en)
SE (1) SE0300089L (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7828930B2 (en) * 2007-11-20 2010-11-09 International Paper Company Use of polysulfide in modified cooking
SE531632C2 (en) * 2007-12-20 2009-06-09 Metso Fiber Karlstad Ab Process of manufacture of sulphate pulp in which hemicelluloses are recycled

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5824188A (en) * 1993-05-04 1998-10-20 Ahlstrom Machinery Inc. Method of controlling the pressure of a continuous digester using an extraction-dilution
US6132556A (en) * 1993-05-04 2000-10-17 Andritz-Ahlstrom Inc. Method of controlling pulp digester pressure via liquor extraction
US5536366A (en) * 1993-05-04 1996-07-16 Ahlstrom Machinery Inc. Digester system for implementing low dissolved solids profiling
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
SE502510C2 (en) * 1994-11-15 1995-11-06 Kvaerner Pulping Tech Black liquor impregnation in single boiler hydraulic boiler
US5925216A (en) * 1994-11-15 1999-07-20 Kvaerner Pulping Ab Method of continuous pulping in a digester with high black liquor usage in the impregnation stage
US5635026A (en) * 1995-11-13 1997-06-03 Ahlstrom Machinery Inc. Cooking cellulose material with high alkali concentrations and/or high pH
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
US5958181A (en) * 1997-08-07 1999-09-28 Ahlstrom Machinery, Inc. Continuous cooking with a two-stage cool impregnation
US6123808A (en) * 1997-12-09 2000-09-26 Ahlstrom Machinery Inc. Distribution of dilution liquor to the discharge of a cellulose pulp digester
US6277240B1 (en) * 1998-10-02 2001-08-21 Andritz-Ahlstrom Inc. Method for continuously pulping cellulosic fibrous material
CA2318027C (en) * 1999-09-13 2008-07-08 Andritz-Ahlstrom Inc. Treating pulp with yield or strength-enhancing additive
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

Also Published As

Publication number Publication date
SE0300089L (en) 2003-07-17
FI20030043A (en) 2003-07-17
US20030131956A1 (en) 2003-07-17
FI20030043A0 (en) 2003-01-13
JP2003213581A (en) 2003-07-30
CA2414070A1 (en) 2003-07-16

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Legal Events

Date Code Title Description
NAV Patent application has lapsed