CA2225740A1 - Continuous digester - Google Patents

Continuous digester

Info

Publication number
CA2225740A1
CA2225740A1 CA002225740A CA2225740A CA2225740A1 CA 2225740 A1 CA2225740 A1 CA 2225740A1 CA 002225740 A CA002225740 A CA 002225740A CA 2225740 A CA2225740 A CA 2225740A CA 2225740 A1 CA2225740 A1 CA 2225740A1
Authority
CA
Canada
Prior art keywords
digester
flow
chamber
digesting
outlets
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.)
Granted
Application number
CA002225740A
Other languages
French (fr)
Other versions
CA2225740C (en
Inventor
Reijo K. Salminen
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.)
ALCO FIBER LLC
Original Assignee
Reijo K. Salminen
Alco Pulp Llc
Alco Fiber Llc
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 Reijo K. Salminen, Alco Pulp Llc, Alco Fiber Llc filed Critical Reijo K. Salminen
Priority claimed from PCT/US1996/011159 external-priority patent/WO1997001666A1/en
Publication of CA2225740A1 publication Critical patent/CA2225740A1/en
Application granted granted Critical
Publication of CA2225740C publication Critical patent/CA2225740C/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • 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
    • D21C7/00—Digesters
    • D21C7/06—Feeding 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
    • D21C7/08—Discharge devices

Landscapes

  • Paper (AREA)

Abstract

A continuous pulp digester (102) having an elongate horizontally aligned pressure vessel (110) through which the wood chips (104) and digesting fluid flow in a forward direction. In a first and second embodiments within pressure vessel there is an inner container defining an elongate chamber or passageway having a square cross-sectional configuration. In a third embodiment the digester chamber is cylindrical. At locations along the digester, there are several pair of liquid flow inlets and outlets which enable filtrate from a pulp washer and a digesting agent to be moved into and across the digesting chamber to flow out the flow outlets. These are recirculated in a net upstream flow pattern toward the outlet end of the digester, and discharged as black liquor at different locations in the digester.
CA002225740A 1995-06-29 1996-06-28 Continuous digester Expired - Fee Related CA2225740C (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US83095P 1995-06-29 1995-06-29
US60/000,830 1995-06-29
US447495P 1995-09-28 1995-09-28
US60/004,474 1995-09-28
PCT/US1996/011159 WO1997001666A1 (en) 1995-06-29 1996-06-28 Continuous digester

Publications (2)

Publication Number Publication Date
CA2225740A1 true CA2225740A1 (en) 1997-01-16
CA2225740C CA2225740C (en) 2008-09-16

Family

ID=39760959

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002225740A Expired - Fee Related CA2225740C (en) 1995-06-29 1996-06-28 Continuous digester

Country Status (1)

Country Link
CA (1) CA2225740C (en)

Also Published As

Publication number Publication date
CA2225740C (en) 2008-09-16

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed

Effective date: 20130628