EP0471154A3 - Sulfite modified continuous digesting - Google Patents

Sulfite modified continuous digesting Download PDF

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Publication number
EP0471154A3
EP0471154A3 EP19910108240 EP91108240A EP0471154A3 EP 0471154 A3 EP0471154 A3 EP 0471154A3 EP 19910108240 EP19910108240 EP 19910108240 EP 91108240 A EP91108240 A EP 91108240A EP 0471154 A3 EP0471154 A3 EP 0471154A3
Authority
EP
European Patent Office
Prior art keywords
sulfite
digester
pulp
flow
pulping
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
EP19910108240
Other versions
EP0471154B1 (en
EP0471154A2 (en
Inventor
Bertil Stromberg
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
Publication of EP0471154A2 publication Critical patent/EP0471154A2/en
Publication of EP0471154A3 publication Critical patent/EP0471154A3/en
Application granted granted Critical
Publication of EP0471154B1 publication Critical patent/EP0471154B1/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
    • 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
    • D21C3/04—Pulping cellulose-containing materials with acids, acid salts or acid anhydrides
    • D21C3/06—Pulping cellulose-containing materials with acids, acid salts or acid anhydrides sulfur dioxide; sulfurous acid; bisulfites sulfites

Abstract

In the production of paper pulp by the sulfite pulping process, the amount of sulfite cooking chemical consumed per ton of pulp produced is significantly lowered, a much lower K-No. can be achieved without screen plugging, the wash circulation temperature is lowered, and the digester (19) runs better, in the practice of the invention. According to the invention, the wood chips entrained in sulfite cooking liquor are fed into the top of a digester, and flow co-currently to a central portion (21) of the digester, at which portion waste liquor is extracted and passed to flash tanks (25). An effective amount of the sulfite cooking liquor (preferably about 5-20%) utilized for producing the pulp is introduced into the vessel in the wash circulation (36), adjacent the bottom of the digester, to flow countercurrently to the material moving downwardly in the vessel. The produced sulfite pulp is withdrawn (at 33) from the bottom of the digester. The invention is primarily applicable to acid or bisulfite pulping, but also can be utilized with alkaline or neutral sulfite pulping. In some circumstances the entire cooking flow can be countercurrent (e.g. 5% up to close to 100% of the sulfite cooking liquor flows countercurrently to the material). <IMAGE>
EP91108240A 1990-08-17 1991-05-22 Sulfite modified continuous digesting Expired - Lifetime EP0471154B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US56914290A 1990-08-17 1990-08-17
US569142 1990-08-17

Publications (3)

Publication Number Publication Date
EP0471154A2 EP0471154A2 (en) 1992-02-19
EP0471154A3 true EP0471154A3 (en) 1993-06-09
EP0471154B1 EP0471154B1 (en) 1997-11-26

Family

ID=24274268

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91108240A Expired - Lifetime EP0471154B1 (en) 1990-08-17 1991-05-22 Sulfite modified continuous digesting

Country Status (10)

Country Link
EP (1) EP0471154B1 (en)
JP (1) JPH04240282A (en)
AT (1) ATE160601T1 (en)
AU (1) AU639109B2 (en)
BR (1) BR9103492A (en)
CA (1) CA2030090A1 (en)
DE (1) DE69128267T2 (en)
FI (1) FI913823A (en)
NO (1) NO913209L (en)
ZA (1) ZA909259B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009057208A1 (en) 2009-11-27 2011-06-01 Technische Universität Dresden Process for the production of lignocellulosic paper pulps and papers, cartons and boards derived therefrom

Citations (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
EP0407370A2 (en) * 1989-06-28 1991-01-09 Kamyr Ab High sulfidity cook for paper pulp using black liquor sulfonization of steamed chips

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI44514B (en) * 1963-12-13 1971-08-02 Kamyr Ab
SE359331B (en) * 1970-03-17 1973-08-27 Kamyr Ab

Patent Citations (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
EP0407370A2 (en) * 1989-06-28 1991-01-09 Kamyr Ab High sulfidity cook for paper pulp using black liquor sulfonization of steamed chips

Also Published As

Publication number Publication date
ZA909259B (en) 1991-11-27
JPH04240282A (en) 1992-08-27
DE69128267D1 (en) 1998-01-08
FI913823A (en) 1992-02-18
FI913823A0 (en) 1991-08-13
NO913209D0 (en) 1991-08-16
AU639109B2 (en) 1993-07-15
NO913209L (en) 1992-02-18
BR9103492A (en) 1992-05-12
DE69128267T2 (en) 1998-06-18
CA2030090A1 (en) 1992-02-18
AU7829691A (en) 1992-02-20
ATE160601T1 (en) 1997-12-15
EP0471154B1 (en) 1997-11-26
EP0471154A2 (en) 1992-02-19

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ZA912117B (en) Extended kraft cooking with white liquor added to wash circulation
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