ATE103351T1 - METHOD OF BLEACHING PULP. - Google Patents
METHOD OF BLEACHING PULP.Info
- Publication number
- ATE103351T1 ATE103351T1 AT89117235T AT89117235T ATE103351T1 AT E103351 T1 ATE103351 T1 AT E103351T1 AT 89117235 T AT89117235 T AT 89117235T AT 89117235 T AT89117235 T AT 89117235T AT E103351 T1 ATE103351 T1 AT E103351T1
- Authority
- AT
- Austria
- Prior art keywords
- pulp
- oxidation
- bleaching
- chemical
- chlorine
- 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
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/10—Bleaching ; Apparatus therefor
- D21C9/1057—Multistage, with compounds cited in more than one sub-group D21C9/10, D21C9/12, D21C9/16
-
- 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
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
- D21C5/005—Treatment of cellulose-containing material with microorganisms or enzymes
-
- 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
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/10—Bleaching ; Apparatus therefor
- D21C9/12—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds
- D21C9/14—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Chemical & Material Sciences (AREA)
- Biochemistry (AREA)
- Microbiology (AREA)
- Paper (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
- Noodles (AREA)
- Cereal-Derived Products (AREA)
- Table Devices Or Equipment (AREA)
Abstract
The invention concerns a procedure for the bleaching of pulp using an oxidating bleaching chemical containing chlorine. The essential features of the invention are that the chemical used in the oxidation stage has a chlorine dioxide content of at least 50 %, that the pulp is subjected to enzyme treatment either in conjunction with or before the oxidation, and that, after the oxidation and enzyme treatment, the pulp is treated with an alkali. The use of enzymes reduces the amount of chlorophenols and other forms of organically bound chlorine in the spent bleach liquor, simultaneously lowering its chemical oxygen demand.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI890700A FI90888B (en) | 1989-02-14 | 1989-02-14 | Method for bleaching cellulose pulp |
EP89117235A EP0383999B1 (en) | 1989-02-14 | 1989-09-18 | Procedure for the bleaching of pulp |
Publications (1)
Publication Number | Publication Date |
---|---|
ATE103351T1 true ATE103351T1 (en) | 1994-04-15 |
Family
ID=8527891
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AT89117235T ATE103351T1 (en) | 1989-02-14 | 1989-09-18 | METHOD OF BLEACHING PULP. |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP0383999B1 (en) |
JP (1) | JPH02221482A (en) |
AT (1) | ATE103351T1 (en) |
CA (1) | CA1339594C (en) |
DE (1) | DE68914135D1 (en) |
ES (1) | ES2050747T3 (en) |
FI (1) | FI90888B (en) |
NO (1) | NO176406C (en) |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI86896B (en) * | 1989-05-04 | 1992-07-15 | Enso Gutzeit Oy | FOERFARANDE FOER BLEKNING AV CELLULOSAMASSA. |
SE465320B (en) * | 1990-01-10 | 1991-08-26 | Korsnaes Ab | PREPARATIONS SUBMITTING ENZYMATIC DELIGNIFICATION ACTIVITY, MADE TO MAKE THE SAME AND APPLICATIONS THEREOF |
FI89814C (en) * | 1990-02-02 | 1993-11-25 | Enso Gutzeit Oy | FOERFARANDE FOER BLEKNING AV CELLULOSAMASSA |
US5837515A (en) * | 1990-05-16 | 1998-11-17 | Alko-Yhtiot Oy | Enzyme preparations and methods for their production |
JP2859393B2 (en) * | 1990-07-24 | 1999-02-17 | ノボ ノルディスク アクティーゼルスカブ | Cellulase and method for producing the same |
DK203490D0 (en) * | 1990-08-24 | 1990-08-24 | Novo Nordisk As | PROCEDURE FOR TREATING LIGNOCELLULOS PULP AND APPARATUS FOR PERFORMING THE PROCESS |
DE4129739A1 (en) * | 1990-09-11 | 1992-03-12 | Sandoz Ag | Chlorine-free bleaching of paper pulp |
FI108800B (en) * | 1991-05-07 | 2002-03-28 | Iogen Corp | A method and apparatus for using an enzyme in the manufacture and bleaching of pulp |
CA2044100A1 (en) * | 1991-06-07 | 1992-12-08 | Janice Hamilton | Biobleaching process |
US5498534A (en) * | 1992-03-25 | 1996-03-12 | The United States Of America As Represented By The Secretary Of Agriculture | Method of removing color from wood pulp using xylanase from streptomyces roseiscleroticus NRRL B-11019 |
US5369024A (en) * | 1992-03-25 | 1994-11-29 | The United States Of America As Represented By The Secretary Of Agriculture | Xylanase from streptomyces roseiscleroticus NRRL-11019 for removing color from kraft wood pulps |
DE4422307A1 (en) * | 1994-06-17 | 1995-12-21 | Melitta Haushaltsprodukte | Process for delignifying and bleaching unbleached pulp suspensions using nitrogen compounds |
US6300114B1 (en) | 1994-07-29 | 2001-10-09 | Rohm Enzyme Finland Oy | Sequences of xylanase and xylanase expression vectors |
US5935836A (en) * | 1994-07-29 | 1999-08-10 | Rohm Enzyme Finland Oy | Actinomadura xylanase sequences and methods of use |
US5871730A (en) * | 1994-07-29 | 1999-02-16 | Universite De Sherbrooke | Thermostable xylanase DNA, protein and methods of use |
US7816129B2 (en) | 1994-07-29 | 2010-10-19 | Ab Enzymes Gmbh | Production and secretion of proteins of bacterial origin in filamentous fungi |
US7320741B2 (en) | 2001-01-18 | 2008-01-22 | Iogen Bio-Products Corporation | Method of xylanase treatment in a chlorine dioxide bleaching sequence |
CN100346030C (en) | 2002-03-06 | 2007-10-31 | 埃欧金生物制品公司 | Xylanase treatment of chemical pulp |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1086905A (en) * | 1977-10-25 | 1980-10-07 | W. Howard Rapson | Bleach plant operation |
JPS5468402A (en) * | 1977-11-09 | 1979-06-01 | Kogyo Gijutsuin | Property modification of biochemical pulp |
FI81395B (en) * | 1988-03-14 | 1990-06-29 | Cultor Oy | FOERFARANDE FOER BLEKNING AV CELLULOSAMASSA. |
-
1989
- 1989-02-14 FI FI890700A patent/FI90888B/en not_active Application Discontinuation
- 1989-09-18 ES ES89117235T patent/ES2050747T3/en not_active Expired - Lifetime
- 1989-09-18 JP JP1241667A patent/JPH02221482A/en active Pending
- 1989-09-18 AT AT89117235T patent/ATE103351T1/en not_active IP Right Cessation
- 1989-09-18 DE DE89117235T patent/DE68914135D1/en not_active Expired - Lifetime
- 1989-09-18 NO NO893714A patent/NO176406C/en not_active IP Right Cessation
- 1989-09-18 EP EP89117235A patent/EP0383999B1/en not_active Revoked
- 1989-09-18 CA CA000611773A patent/CA1339594C/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH02221482A (en) | 1990-09-04 |
FI90888B (en) | 1993-12-31 |
ES2050747T3 (en) | 1994-06-01 |
DE68914135D1 (en) | 1994-04-28 |
EP0383999B1 (en) | 1994-03-23 |
CA1339594C (en) | 1997-12-23 |
FI890700A0 (en) | 1989-02-14 |
NO893714D0 (en) | 1989-09-18 |
NO893714L (en) | 1990-08-15 |
FI890700A (en) | 1990-08-15 |
NO176406B (en) | 1994-12-19 |
NO176406C (en) | 1995-03-29 |
EP0383999A3 (en) | 1990-12-12 |
EP0383999A2 (en) | 1990-08-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
UEP | Publication of translation of european patent specification | ||
RZN | Patent revoked |