GB682694A - Improvements in or relating to bleaching processes - Google Patents

Improvements in or relating to bleaching processes

Info

Publication number
GB682694A
GB682694A GB964/50A GB96450A GB682694A GB 682694 A GB682694 A GB 682694A GB 964/50 A GB964/50 A GB 964/50A GB 96450 A GB96450 A GB 96450A GB 682694 A GB682694 A GB 682694A
Authority
GB
United Kingdom
Prior art keywords
sodium chlorite
bleached
hydrofluoric acid
cotton
treated
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
GB964/50A
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.)
Mathieson Chemical Corp
Olin Corp
Original Assignee
Mathieson Chemical Corp
Olin 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 Mathieson Chemical Corp, Olin Corp filed Critical Mathieson Chemical Corp
Publication of GB682694A publication Critical patent/GB682694A/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
    • D21C9/12—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds
    • D21C9/14—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites
    • 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
    • D06L4/20—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which contain halogen
    • D06L4/22—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which contain halogen using inorganic agents
    • D06L4/24—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which contain halogen using inorganic agents using chlorites or chlorine dioxide
    • D06L4/26—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which contain halogen using inorganic agents using chlorites or chlorine dioxide combined with specific additives

Abstract

Textiles and the like of cellulose materials or derivatives and artificial resins are bleached with aqueous solutions of alkaline or alkaline earth chlorites in the presence of hydrofluoric acid or one of its acid or neutral salts. In examples: (1) cotton is bleached in a bath containing sodium chlorite and ammonium difluoride; (2) flax tow is first treated with sodium hypochlorite and then with sodium chlorite and hydrofluoric acid; (3) genista fibre is treated as in (2); (4) cotton wool obtained by alkaline boiling of cotton linters followed by chlorinating with calcium hypochlorite, is heated with sodium chlorite and ammonium difluoride; (5) rayon is bleached in a bath containing sodium chlorite, hydrofluoric acid and a wetting agent; (6) wool having a colour of ferruginous origin is treated with sodium chlorite and ammonium difluoride; (7) cellulose pulp is bleached with sodium chlorite in the presence of hydrofluoric acid, and (8) cotton is bleached with sodium chlorite, hydrofluoric acid and sodium pyrophosphate. Specification 496,247 is referred to.
GB964/50A 1949-01-14 1949-01-13 Improvements in or relating to bleaching processes Expired GB682694A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR982163T 1949-01-14

Publications (1)

Publication Number Publication Date
GB682694A true GB682694A (en) 1952-11-12

Family

ID=8834844

Family Applications (1)

Application Number Title Priority Date Filing Date
GB964/50A Expired GB682694A (en) 1949-01-14 1949-01-13 Improvements in or relating to bleaching processes

Country Status (6)

Country Link
BE (1) BE493124A (en)
CH (1) CH289967A (en)
DE (1) DE821483C (en)
FR (1) FR982163A (en)
GB (1) GB682694A (en)
NL (1) NL77714C (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2932550A (en) * 1953-10-14 1960-04-12 Chemstrand Corp Acid pretreatment of polyacrylonitrile-type fibers and the treated fibers
US2952505A (en) * 1953-10-14 1960-09-13 Chemstrand Corp Process for dyeing shaped articles
US3097049A (en) * 1959-03-26 1963-07-09 Meybeck Jean Process for bleaching and shrinkproofing wool

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1087561B (en) * 1953-12-15 1960-08-25 Hoechst Ag Process to reduce the escape of chlorine dioxide from acidic chlorite baths or chlorine dioxide solutions
DE1089722B (en) * 1956-10-19 1960-09-29 Degussa Method of bleaching

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2932550A (en) * 1953-10-14 1960-04-12 Chemstrand Corp Acid pretreatment of polyacrylonitrile-type fibers and the treated fibers
US2952505A (en) * 1953-10-14 1960-09-13 Chemstrand Corp Process for dyeing shaped articles
US3097049A (en) * 1959-03-26 1963-07-09 Meybeck Jean Process for bleaching and shrinkproofing wool

Also Published As

Publication number Publication date
DE821483C (en) 1951-11-19
BE493124A (en) 1950-07-05
NL77714C (en) 1955-04-15
CH289967A (en) 1953-04-15
FR982163A (en) 1951-06-07

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