GB561022A - Improvements in bleaching cellulosic materials - Google Patents

Improvements in bleaching cellulosic materials

Info

Publication number
GB561022A
GB561022A GB14023/42A GB1402342A GB561022A GB 561022 A GB561022 A GB 561022A GB 14023/42 A GB14023/42 A GB 14023/42A GB 1402342 A GB1402342 A GB 1402342A GB 561022 A GB561022 A GB 561022A
Authority
GB
United Kingdom
Prior art keywords
hour
aqueous solution
formaldehyde
buffered
washed
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
GB14023/42A
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 Alkali Works Inc
Original Assignee
Mathieson Alkali Works Inc
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 Alkali Works Inc filed Critical Mathieson Alkali Works Inc
Publication of GB561022A publication Critical patent/GB561022A/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
    • D21C9/1026—Other features in bleaching processes
    • D21C9/1036—Use of compounds accelerating or improving the efficiency of the processes
    • 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
    • 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

Abstract

Cellulosic material is bleached by subjecting it to the action of an aqueous solution, at a pH of about 3-9, containing an alkali or alkaline earth metal chlorite and an aldehyde. The process is especially useful for completing the bleaching of material already partially bleached by the customary methods, and is applicable to wood pulp, cotton linters and textile fibres, e.g. of cotton, hemp or regenerated cellulose. Specified chlorites are those of sodium and calcium and specified aldehydes are formaldehyde, paraformaldehyde, acetaldehyde, furfural, benzaldehyde, the 5- and 6-carbon atom aldoses and inverted sucrose. In examples: (1) a kraft pulp is suspended for 2 hours in an aqueous solution at 60 DEG C. containing sodium chlorite and formaldehyde and buffered with sodium hydroxide to pH=8, and is separated and washed; (2) and (3) a kraft pulp is suspended for (2) 3 hours, (3) 1 hour, in an aqueous solution at (2) 25 DEG C., (3) 50 DEG C., containing sodium chlorite and formaldehyde and buffered with sodium bicarbonate and monosodium phosphate to pH=(2) 7.1, (3) 6.9, and is separated and washed; (4) a kraft pulp is suspended for 1 hour in an aqueous solution at 50 DEG C. of formaldehyde buffered to pH=7.1, separated, washed, suspended for 1 hour in an aqueous solution at 50 DEG C. containing sodium chlorite and formaldehyde and buffered to pH=7.4, and is separated and washed; (5), (9) and (10) a kraft pulp is suspended for 1 hour in an aqueous solution at 50 DEG C. containing sodium chlorite and (5) acetaldehyde, (9) benzaldehyde, (10) furfural, and buffered to pH=7.1, and is separated and washed; (6), (7) and (8), cotton muslin is kier-boiled, soaked (6) for 1 hour at 75 DEG C., (7) for 2 hours at 20-25 DEG C., (8) for 1 hour at 20-25 DEG C., in an aqueous solution containing sodium chlorite and formaldehyde (6) and (7) unbuffered at an initial pH of 8 to 9, (8) buffered to a pH of 7.0, drained, maintained in a closed vessel (6) for 1 hour at 75 DEG C., (7) for 2 hours at 25 DEG C., (8) for 1 hour at 25 DEG C., washed and ironed dry; (11) a kraft pulp is suspended for 1 hour in an aqueous solution at 56-58 DEG C. containing sodium chlorite and formaldehyde and buffered with mono- and di-sodium phosphates to pH=6.95 to 7.0, and is separated and washed; (12) a kraft pulp is suspended for 2 hours in an aqueous solution at 50 DEG C. containing sodium chlorite and formaldehyde and buffered with sulphuric acid to pH=7, and is separated and washed.
GB14023/42A 1941-10-08 1942-10-06 Improvements in bleaching cellulosic materials Expired GB561022A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US414139A US2367771A (en) 1941-10-08 1941-10-08 Bleaching cellulosic materials

Publications (1)

Publication Number Publication Date
GB561022A true GB561022A (en) 1944-05-02

Family

ID=23640113

Family Applications (1)

Application Number Title Priority Date Filing Date
GB14023/42A Expired GB561022A (en) 1941-10-08 1942-10-06 Improvements in bleaching cellulosic materials

Country Status (4)

Country Link
US (1) US2367771A (en)
DE (1) DE843807C (en)
FR (1) FR915778A (en)
GB (1) GB561022A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE904885C (en) * 1946-12-21 1954-02-22 Solvay Process for activating the oxidative capacity of chlorite solutions

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE23218E (en) * 1945-02-21 1950-04-11 Catalytic bleaching with chlorites
NL76612C (en) * 1947-12-26
US3257324A (en) * 1955-04-20 1966-06-21 Colgate Palmolive Co Solid bleach composition and method of making and using same
US3063782A (en) * 1960-02-29 1962-11-13 Olin Mathieson Bleaching cellulosic materials
US3790343A (en) * 1971-12-10 1974-02-05 S Ikeda Method for bleaching fibrous materials and compositions therefor
JPS5167472A (en) * 1974-12-06 1976-06-11 Santo Tekkosho Kk Senihinno hyohakuhoho
DE2657192B1 (en) * 1976-12-17 1978-06-08 Degussa Process for cleaning waste water containing phenol and phenol / formaldehyde
US4241093A (en) * 1978-05-11 1980-12-23 U and I, Incorporated Food supplement from vegetable pulp and method of preparing same
EP0365590A4 (en) * 1987-06-04 1991-04-03 American Crystal Sugar Company Method of removing oxalic acid and/or sulfite from sugarbeets
US5112638A (en) * 1989-09-11 1992-05-12 American Crystal Sugar Company Process for the improvement of edible fiber and product
US5137744A (en) * 1989-09-11 1992-08-11 American Crystal Sugar Company Process and system for the improvement of edible fiber and product
DE4329959A1 (en) * 1993-09-04 1995-03-16 Hoechst Ag Alkaline chlorite bleach
ATE207153T1 (en) * 1997-05-30 2001-11-15 Schoeller & Hoesch Papierfab METHOD FOR PRODUCING BLEACHED SPECIAL PULP

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE904885C (en) * 1946-12-21 1954-02-22 Solvay Process for activating the oxidative capacity of chlorite solutions

Also Published As

Publication number Publication date
DE843807C (en) 1952-07-14
FR915778A (en) 1946-11-18
US2367771A (en) 1945-01-23

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