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 FIBERS

Info

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
Application number
DE69822893T
Other languages
German (de)
Inventor
D Evans
C Francis
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.)
NAT SILICATES PARTNERSHIP ETOB
Research Foundation of State University of New York
Original Assignee
NAT SILICATES PARTNERSHIP ETOB
Research Foundation of State University of New York
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 NAT SILICATES PARTNERSHIP ETOB, Research Foundation of State University of New York filed Critical NAT SILICATES PARTNERSHIP ETOB
Application granted granted Critical
Publication of DE69822893D1 publication Critical patent/DE69822893D1/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
    • 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.
DE69822893T 1998-05-15 1998-05-15 PEROXIDES, OXYGEN, AND PEROXIDES / OXYGEN BLEACH OF CELLULAR MATERIALS AND WASTE PAPER FIBERS Expired - Lifetime DE69822893D1 (en)

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)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
EP1088130B1 (en) 2004-03-31
AU7493898A (en) 1999-12-06
EP1088130A2 (en) 2001-04-04
CA2332304C (en) 2005-01-11
WO1999060201A3 (en) 2000-08-03
MXPA00011196A (en) 2003-04-22
ATE263268T1 (en) 2004-04-15
WO1999060201A2 (en) 1999-11-25
CA2332304A1 (en) 1999-11-25

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Legal Events

Date Code Title Description
8332 No legal effect for de