PT92896A - Processo para a fabricacao de polpa de celulose - Google Patents
Processo para a fabricacao de polpa de celuloseInfo
- Publication number
- PT92896A PT92896A PT92896A PT9289690A PT92896A PT 92896 A PT92896 A PT 92896A PT 92896 A PT92896 A PT 92896A PT 9289690 A PT9289690 A PT 9289690A PT 92896 A PT92896 A PT 92896A
- Authority
- PT
- Portugal
- Prior art keywords
- liquid
- acidity
- lignocellulosic material
- pulp
- activation
- 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
- D21C3/00—Pulping cellulose-containing materials
- D21C3/02—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B1/00—Preparatory treatment of cellulose for making derivatives thereof, e.g. pre-treatment, pre-soaking, activation
-
- 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
- D21C1/00—Pretreatment of the finely-divided materials before digesting
- D21C1/04—Pretreatment of the finely-divided materials before digesting with acid reacting compounds
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE8900177A SE462920B (sv) | 1989-01-19 | 1989-01-19 | Foerfarande foer aktivering av cellulosamassa med kvaevedioxid innehaallande gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| PT92896A true PT92896A (pt) | 1990-07-31 |
| PT92896B PT92896B (pt) | 1995-12-29 |
Family
ID=20374787
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PT92896A PT92896B (pt) | 1989-01-19 | 1990-01-18 | Processo para a fabricacao de polpa de celulose |
Country Status (13)
| Country | Link |
|---|---|
| EP (1) | EP0454757B1 (pt) |
| JP (1) | JPH04502790A (pt) |
| AT (1) | ATE110130T1 (pt) |
| AU (1) | AU620210B2 (pt) |
| CA (1) | CA2045497A1 (pt) |
| DE (1) | DE69011669T2 (pt) |
| ES (1) | ES2057534T3 (pt) |
| FI (1) | FI913448A0 (pt) |
| NZ (1) | NZ232124A (pt) |
| PT (1) | PT92896B (pt) |
| SE (1) | SE462920B (pt) |
| WO (1) | WO1990008221A1 (pt) |
| ZA (1) | ZA90404B (pt) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE448006B (sv) * | 1981-09-21 | 1987-01-12 | Mo Och Domsjoe Ab | Forfarande for blekning av cellulosamassa innefattande ett aktiveringssteg med kveveoxider |
-
1989
- 1989-01-19 SE SE8900177A patent/SE462920B/sv not_active IP Right Cessation
-
1990
- 1990-01-16 CA CA002045497A patent/CA2045497A1/en not_active Abandoned
- 1990-01-16 NZ NZ232124A patent/NZ232124A/en unknown
- 1990-01-16 WO PCT/SE1990/000036 patent/WO1990008221A1/en active IP Right Grant
- 1990-01-16 ES ES90902410T patent/ES2057534T3/es not_active Expired - Lifetime
- 1990-01-16 EP EP90902410A patent/EP0454757B1/en not_active Expired - Lifetime
- 1990-01-16 AU AU49522/90A patent/AU620210B2/en not_active Ceased
- 1990-01-16 JP JP2502405A patent/JPH04502790A/ja active Pending
- 1990-01-16 DE DE69011669T patent/DE69011669T2/de not_active Expired - Fee Related
- 1990-01-16 AT AT90902410T patent/ATE110130T1/de not_active IP Right Cessation
- 1990-01-18 PT PT92896A patent/PT92896B/pt not_active IP Right Cessation
- 1990-01-19 ZA ZA90404A patent/ZA90404B/xx unknown
-
1991
- 1991-07-17 FI FI913448A patent/FI913448A0/fi not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| EP0454757A1 (en) | 1991-11-06 |
| JPH04502790A (ja) | 1992-05-21 |
| FI913448A0 (fi) | 1991-07-17 |
| CA2045497A1 (en) | 1990-07-20 |
| EP0454757B1 (en) | 1994-08-17 |
| ATE110130T1 (de) | 1994-09-15 |
| NZ232124A (en) | 1991-03-26 |
| WO1990008221A1 (en) | 1990-07-26 |
| PT92896B (pt) | 1995-12-29 |
| AU4952290A (en) | 1990-08-13 |
| SE8900177L (sv) | 1990-07-20 |
| AU620210B2 (en) | 1992-02-13 |
| DE69011669D1 (de) | 1994-09-22 |
| ZA90404B (en) | 1990-10-31 |
| SE8900177D0 (sv) | 1989-01-19 |
| DE69011669T2 (de) | 1994-12-08 |
| ES2057534T3 (es) | 1994-10-16 |
| SE462920B (sv) | 1990-09-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0319563B1 (en) | Process for bleaching of materials with a dithionite solution | |
| EP0395792B1 (en) | Procedure for the bleaching of pulp | |
| FI891248A (fi) | Menetelmä puumassan samanaikaiseksi jauhamiseksi ja valkaisemiseksi | |
| DE68914135D1 (de) | Verfahren zum Bleichen von Zellstoff. | |
| EP0587270A1 (en) | Method of bleaching paper pulp | |
| PT92896A (pt) | Processo para a fabricacao de polpa de celulose | |
| US2528350A (en) | Two-step digestion of hardwoods | |
| EP0508064A1 (de) | Verfahren zur Delignifizierung von cellulosehaltigen Rohstoffen | |
| US4537656A (en) | Method for delignifying or bleaching cellulose pulp wherein chlorine is added to recycle liquor to regenerate chlorine dioxide | |
| CA1070056A (en) | Process for oxygen alkali delignification of wood pulp | |
| US5607547A (en) | Method for reduced sulfur dioxide formation in refiner bleaching | |
| CA1180512A (en) | Process for reducing carbohydrate losses in the sulfate pulping of wood by pretreating the wood with oxygen and nitrogen oxides | |
| CA1068054A (en) | Method for controlling the addition of active chemical for delignifying and/or bleaching cellulose pulp suspended in a liquor containing chemicals reactive with the delignifying and/or bleaching chemical | |
| US20030168190A1 (en) | Method for controlling the delignfication and bleaching of a pulp suspension | |
| DE4107357C1 (pt) | ||
| SU1587095A1 (ru) | Способ получени беленой целлюлозы дл химической переработки | |
| AU605913B2 (en) | A method in the activation of lignocellulosic material with a gas containing nitrogen dioxide | |
| FI80731C (fi) | Foerfarande foer styrning av alkalisk cellulosakok. | |
| Isoaho et al. | Chemistry of dithionite bleaching. Part 2. Comparable study with different thermomechanical and recycled fibre pulp | |
| DE3274887D1 (en) | A method of polysulphide treatment in alkaline pulping of lignocellulose material | |
| US5456799A (en) | Method for controlling activation of lignocellulosic material in the presence of a nitrate containing liquid | |
| NZ198925A (en) | Method for bleaching cellulose pulp using nitrogen oxides and oxygen followed by an alkali treatment | |
| SU145128A1 (ru) | Способ получени целлюлозы и полуцеллюлозы | |
| JPS6440692A (en) | Bleaching of old paper pulp by waste gas desulfurizing product | |
| GB1455399A (en) | Method for digesting wood |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FG3A | Patent granted, date of granting |
Effective date: 19950911 |
|
| NF3A | Restitutio in integrum |
Effective date: 19970508 |
|
| PC3A | Transfer or assignment |
Free format text: 19990310 SUNDS DEFIBRATOR INDUSTRIES AB SE |
|
| MM3A | Annulment or lapse |
Free format text: LAPSE DUE TO NON-PAYMENT OF FEES Effective date: 20030331 |