DE69822893D1 - PEROXIDES, OXYGEN, AND PEROXIDES / OXYGEN BLEACH OF CELLULAR MATERIALS AND WASTE PAPER FIBERS - Google Patents
PEROXIDES, OXYGEN, AND PEROXIDES / OXYGEN BLEACH OF CELLULAR MATERIALS AND WASTE PAPER FIBERSInfo
- Publication number
- DE69822893D1 DE69822893D1 DE69822893T DE69822893T DE69822893D1 DE 69822893 D1 DE69822893 D1 DE 69822893D1 DE 69822893 T DE69822893 T DE 69822893T DE 69822893 T DE69822893 T DE 69822893T DE 69822893 D1 DE69822893 D1 DE 69822893D1
- Authority
- DE
- Germany
- Prior art keywords
- peroxide
- oxygen
- peroxides
- molecular weight
- high molecular
- 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.)
- Expired - Lifetime
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
- D21C9/147—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications
-
- 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
- D21C9/1026—Other features in bleaching processes
- D21C9/1036—Use of compounds accelerating or improving the efficiency of the 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
- 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
- D21C9/16—Bleaching ; Apparatus therefor with per compounds
- D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
- Detergent Compositions (AREA)
Abstract
A composition and method for use in the peroxide, oxygen, or peroxide/oxygen stage of brightening pulps with less than 18 % lignin utilize a megnesium compound in a sodium silicate solution to form a higher percentage of high molecular weight silicates. Such high molecular weight silicates preferentially adsorb transition metal impurities which, if left in solution, would tend to decompose hydrogen peroxide and organic peroxides. Hydrogen peroxide is added to peroxide and peroxide/oxygen stages, while it is generated, along with organic peroxides, during an oxygen stage. Decomposition decreases the amount of peroxide that actually reacts with lignin and generates free radicals that attack the desired product, carbohydrate fibers. The high molecular weight silicates can be formed by using any magnesium compound which dissociates to form Mg(OH)<+> cations, which in turn cause a silicate polymerization reaction. The formation of Mg(OH)<+> cations from magnesium compounds occurs most realidy over a pH range of at least about 8 and preferably between about 8 and about 12. The magnesium compound is added in an amount to achieve an Mg:SiO2 mass ratio of between about 1:46 to about 1:2, and preferably between about 1:15 to about 1:3.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/US1998/010070 WO1999060201A2 (en) | 1998-05-15 | 1998-05-15 | Peroxide, oxygen, and peroxide/oxygen brightening of chemical and mixed waste pulps |
Publications (1)
Publication Number | Publication Date |
---|---|
DE69822893D1 true DE69822893D1 (en) | 2004-05-06 |
Family
ID=22267079
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE69822893T Expired - Lifetime DE69822893D1 (en) | 1998-05-15 | 1998-05-15 | PEROXIDES, OXYGEN, AND PEROXIDES / OXYGEN BLEACH OF CELLULAR MATERIALS AND WASTE PAPER FIBERS |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1088130B1 (en) |
AT (1) | ATE263268T1 (en) |
AU (1) | AU7493898A (en) |
CA (1) | CA2332304C (en) |
DE (1) | DE69822893D1 (en) |
MX (1) | MXPA00011196A (en) |
WO (1) | WO1999060201A2 (en) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2557605B1 (en) * | 1983-12-29 | 1987-12-11 | Atochem | PROCESS FOR BLEACHING PAPER PULP BY HYDROGEN PEROXIDE |
US4915785A (en) * | 1988-12-23 | 1990-04-10 | C-I-L Inc. | Single stage process for bleaching of pulp with an aqueous hydrogen peroxide bleaching composition containing magnesium sulphate and sodium silicate |
SE500353C2 (en) * | 1992-10-26 | 1994-06-06 | Sca Wifsta Oestrand Ab | Peroxide bleaching of sulfate pulp with the addition of magnesium before bleaching |
-
1998
- 1998-05-15 DE DE69822893T patent/DE69822893D1/en not_active Expired - Lifetime
- 1998-05-15 CA CA002332304A patent/CA2332304C/en not_active Expired - Lifetime
- 1998-05-15 MX MXPA00011196A patent/MXPA00011196A/en not_active IP Right Cessation
- 1998-05-15 AT AT98922379T patent/ATE263268T1/en not_active IP Right Cessation
- 1998-05-15 EP EP98922379A patent/EP1088130B1/en not_active Expired - Lifetime
- 1998-05-15 AU AU74938/98A patent/AU7493898A/en not_active Abandoned
- 1998-05-15 WO PCT/US1998/010070 patent/WO1999060201A2/en active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
AU7493898A (en) | 1999-12-06 |
WO1999060201A2 (en) | 1999-11-25 |
ATE263268T1 (en) | 2004-04-15 |
EP1088130B1 (en) | 2004-03-31 |
WO1999060201A3 (en) | 2000-08-03 |
CA2332304C (en) | 2005-01-11 |
EP1088130A2 (en) | 2001-04-04 |
MXPA00011196A (en) | 2003-04-22 |
CA2332304A1 (en) | 1999-11-25 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8332 | No legal effect for de |