ZA909259B - Sulfite modified continuous digesting - Google Patents
Sulfite modified continuous digestingInfo
- Publication number
- ZA909259B ZA909259B ZA909259A ZA909259A ZA909259B ZA 909259 B ZA909259 B ZA 909259B ZA 909259 A ZA909259 A ZA 909259A ZA 909259 A ZA909259 A ZA 909259A ZA 909259 B ZA909259 B ZA 909259B
- Authority
- ZA
- South Africa
- Prior art keywords
- sulfite
- digester
- pulp
- flow
- pulping
- Prior art date
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
Landscapes
- Paper (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
- Packages (AREA)
- Materials For Medical Uses (AREA)
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
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 The produced sulfite pulp is withdrawn (at 33) from the bottom of the digester.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>
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US56914290A | 1990-08-17 | 1990-08-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ZA909259B true ZA909259B (en) | 1991-11-27 |
Family
ID=24274268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ZA909259A ZA909259B (en) | 1990-08-17 | 1990-11-19 | 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)
| 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 |
Family Cites Families (5)
| 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 |
| FI44514B (en) * | 1963-12-13 | 1971-08-02 | Kamyr Ab | |
| US3427218A (en) * | 1964-07-10 | 1969-02-11 | Kamyr Ab | Method of performing counter-current continuous cellulose digestion |
| SE359331B (en) * | 1970-03-17 | 1973-08-27 | Kamyr Ab | |
| US5053108A (en) * | 1989-06-28 | 1991-10-01 | Kamyr Ab | High sulfidity cook for paper pulp using black liquor sulfonization of steamed chips |
-
1990
- 1990-11-15 CA CA002030090A patent/CA2030090A1/en not_active Abandoned
- 1990-11-19 ZA ZA909259A patent/ZA909259B/en unknown
-
1991
- 1991-05-22 DE DE69128267T patent/DE69128267T2/en not_active Expired - Fee Related
- 1991-05-22 EP EP91108240A patent/EP0471154B1/en not_active Expired - Lifetime
- 1991-05-22 AT AT91108240T patent/ATE160601T1/en not_active IP Right Cessation
- 1991-06-11 AU AU78296/91A patent/AU639109B2/en not_active Expired - Fee Related
- 1991-06-20 JP JP3148635A patent/JPH04240282A/en not_active Withdrawn
- 1991-08-13 FI FI913823A patent/FI913823A/en unknown
- 1991-08-15 BR BR919103492A patent/BR9103492A/en unknown
- 1991-08-16 NO NO91913209A patent/NO913209L/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| AU7829691A (en) | 1992-02-20 |
| EP0471154A2 (en) | 1992-02-19 |
| NO913209D0 (en) | 1991-08-16 |
| CA2030090A1 (en) | 1992-02-18 |
| BR9103492A (en) | 1992-05-12 |
| DE69128267D1 (en) | 1998-01-08 |
| EP0471154A3 (en) | 1993-06-09 |
| FI913823A (en) | 1992-02-18 |
| DE69128267T2 (en) | 1998-06-18 |
| EP0471154B1 (en) | 1997-11-26 |
| AU639109B2 (en) | 1993-07-15 |
| FI913823A0 (en) | 1991-08-13 |
| JPH04240282A (en) | 1992-08-27 |
| ATE160601T1 (en) | 1997-12-15 |
| NO913209L (en) | 1992-02-18 |
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