GB785737A - Maintenance of brightness in bleached wood pulp - Google Patents

Maintenance of brightness in bleached wood pulp

Info

Publication number
GB785737A
GB785737A GB30309/55A GB3030955A GB785737A GB 785737 A GB785737 A GB 785737A GB 30309/55 A GB30309/55 A GB 30309/55A GB 3030955 A GB3030955 A GB 3030955A GB 785737 A GB785737 A GB 785737A
Authority
GB
United Kingdom
Prior art keywords
brightness
pulp
wood pulp
maintenance
added
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
Application number
GB30309/55A
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.)
FMC Corp
Original Assignee
FMC Corp
Food Machinery and Chemical Corp
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 FMC Corp, Food Machinery and Chemical Corp filed Critical FMC Corp
Publication of GB785737A publication Critical patent/GB785737A/en
Expired 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
    • D21C9/16—Bleaching ; Apparatus therefor with per compounds
    • D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06L—DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
    • D06L4/00—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs
    • D06L4/10—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which develop oxygen
    • 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
    • D21C9/1047—Conserving the bleached pulp

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Textile Engineering (AREA)
  • Paper (AREA)

Abstract

The brightness of bleached chemical wood pulp of density 75-90 per cent and pH 6-10 is maintained by incorporating in the pulp 0.02-0.25 per cent of hydrogen peroxide, based on the weight of the pulp. The hydrogen peroxide may be obtained from a compound generating it in aqueous solution, and may be added to the pump at the same time as its pH is adjusted with an alkali metal pyrophosphate, tripolyphosphate or other phosphate or borate, or sodium silicate, carbonate or hydroxide. Wetting or sequestering agents, e.g. the sodium salt of ethylenediamine tetra-acetic acid, may also be added.
GB30309/55A 1954-11-19 1955-10-24 Maintenance of brightness in bleached wood pulp Expired GB785737A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US341706XA 1954-11-19 1954-11-19

Publications (1)

Publication Number Publication Date
GB785737A true GB785737A (en) 1957-11-06

Family

ID=21874739

Family Applications (2)

Application Number Title Priority Date Filing Date
GB30309/55A Expired GB785737A (en) 1954-11-19 1955-10-24 Maintenance of brightness in bleached wood pulp
GB31083/55A Expired GB791352A (en) 1954-11-19 1955-10-31 A method of bleaching wood pulps

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB31083/55A Expired GB791352A (en) 1954-11-19 1955-10-31 A method of bleaching wood pulps

Country Status (6)

Country Link
BE (1) BE542859A (en)
CH (2) CH348044A (en)
DE (2) DE1043789B (en)
FR (2) FR1159573A (en)
GB (2) GB785737A (en)
NL (1) NL202075A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1103121B (en) * 1958-02-10 1961-03-23 Mo Och Domsjoe Ab Process for the treatment of pulp with alkali borohydrides

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2218376A1 (en) * 1973-02-16 1974-09-13 Air Liquide Suppression of mould and yellowing of paper pastes - by washing with hydrogen peroxide and sodium diethylene triamine pentacetate
FR2613388B1 (en) * 1987-04-02 1990-05-04 Atochem PROCESS FOR BLEACHING PASTA
SE9402542D0 (en) * 1994-07-20 1994-07-20 Kvaerner Pulping Tech Method and apparatus for bleaching with pressurized peroxide

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2029985A (en) * 1932-05-31 1936-02-04 Buffalo Electro Chem Co Method of bleaching
US2125634A (en) * 1937-03-29 1938-08-02 Oxford Paper Co Method of bleaching pulp or paper webs
US2150926A (en) * 1937-07-03 1939-03-21 Buffalo Electro Chem Co Process of making and bleaching paper
US2510595A (en) * 1946-09-20 1950-06-06 Buffalo Electro Chem Co Method of bleaching groundwood
GB671962A (en) * 1949-08-30 1952-05-14 Buffalo Electro Chem Co Process of bleaching wood pulp
US2692181A (en) * 1950-03-08 1954-10-19 Buffalo Electro Chem Co Treatment of unbleached sulfite pulp
US2661261A (en) * 1950-06-30 1953-12-01 Buffalo Electro Chem Co Method of superbleaching chemical pulp
BE517333A (en) * 1952-02-02

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1103121B (en) * 1958-02-10 1961-03-23 Mo Och Domsjoe Ab Process for the treatment of pulp with alkali borohydrides

Also Published As

Publication number Publication date
FR1153424A (en) 1958-03-10
DE1043789B (en) 1958-11-13
CH341706A (en) 1959-10-15
FR1159573A (en) 1958-06-30
CH348044A (en) 1960-07-31
BE542859A (en) 1959-09-11
GB791352A (en) 1958-02-26
DE1049222B (en) 1959-01-22
NL202075A (en)

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