GB1030416A - Improvements in the bleaching of cellulose pulp - Google Patents

Improvements in the bleaching of cellulose pulp

Info

Publication number
GB1030416A
GB1030416A GB7011/63A GB701163A GB1030416A GB 1030416 A GB1030416 A GB 1030416A GB 7011/63 A GB7011/63 A GB 7011/63A GB 701163 A GB701163 A GB 701163A GB 1030416 A GB1030416 A GB 1030416A
Authority
GB
United Kingdom
Prior art keywords
bleaching
pulp
density
solution
sodium
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
GB7011/63A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB1030416A publication Critical patent/GB1030416A/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
    • 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

Landscapes

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

Abstract

Cellulosic pulp, e.g. pulp obtained from wood, straw or bagasse, is bleached by a continuous process comprising treating it with an excess of a bleaching solution, subjecting the pulp-bleach mixture obtained to bleaching conditions, recovering the bleaching solution from the mixture when the pulp has been bleached to only 50-95% of the maximum brightness obtainable under the bleaching conditions or when the rate of consumption of the bleaching agent decreases or the rate of increase of the brightness in the pulp decreases, in an amount increasing the density of the remaining bleached pulp to at least three times the density of the pulp-bleach mixture and recycling 50-100% by weight of the recovered solution for the bleaching of fresh pulp, the ratio of recycled to fresh bleaching solution, the ratio of the densities prior to and after addition of the bleaching solution and the ratio of the density prior to addition of the bleaching solution to the increased density being maintained constant during the process. The bleaching agent may be an aqueous alkaline solution saturated with gaseous oxygen, liquid chlorine, aqueous solutions of chlorine, sodium hypochlorite, calcium hypochlorite, sodium peroxide, hydrogen peroxide, chlorine dioxide, calcium bisulphite, sodium bisulphite, sodium hydrosulphite or zinc hydrosulphite. Bleaching adjuvants, e.g. sodium hydroxide, sodium silicate polyphosphates and ethylene tetraacetic may be added to the bleaching solution. The density of the pulp-bleach mixture may be increased by using band pressure filters, suction drum filters, double screen presses, screw presses, roller presses or centrifuges. The ratio of the density prior to and after the addition of the bleaching agent may be at least 3:1.
GB7011/63A 1962-02-23 1963-02-21 Improvements in the bleaching of cellulose pulp Expired GB1030416A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB66077A DE1203592B (en) 1962-02-23 1962-02-23 Process for the bleaching of cellulosic fibers

Publications (1)

Publication Number Publication Date
GB1030416A true GB1030416A (en) 1966-05-25

Family

ID=6975007

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7011/63A Expired GB1030416A (en) 1962-02-23 1963-02-21 Improvements in the bleaching of cellulose pulp

Country Status (3)

Country Link
DE (1) DE1203592B (en)
FR (1) FR1348777A (en)
GB (1) GB1030416A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3202978A1 (en) * 2016-02-04 2017-08-09 Kaya, Muhammet Method for producing nanocrystalline cellulose from linter

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE415581B (en) * 1977-04-18 1980-10-13 Mo Och Domsjoe Ab PROCEDURE FOR PEROCID WHITING OF HOG REPLACEMENT MASS
AU539108B2 (en) * 1979-04-17 1984-09-13 Interox Societe Anonyme Delignification of unbleached chemical pulp
FR2454479A1 (en) * 1979-04-17 1980-11-14 Europeen Cellulose Delignification of chemical pulp - by peroxide oxidation in alkaline medium followed by mechanical pressing
SE451606B (en) * 1982-09-14 1987-10-19 Sca Development Ab VIEW WHITENING OF HOG REPLACEMENT MASSES AVERAGE PEROXIDES

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3202978A1 (en) * 2016-02-04 2017-08-09 Kaya, Muhammet Method for producing nanocrystalline cellulose from linter

Also Published As

Publication number Publication date
DE1203592B (en) 1965-10-21
FR1348777A (en) 1964-01-10

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