GB1242709A - Bleaching of cellulosic pulp - Google Patents

Bleaching of cellulosic pulp

Info

Publication number
GB1242709A
GB1242709A GB59738/68A GB5973868A GB1242709A GB 1242709 A GB1242709 A GB 1242709A GB 59738/68 A GB59738/68 A GB 59738/68A GB 5973868 A GB5973868 A GB 5973868A GB 1242709 A GB1242709 A GB 1242709A
Authority
GB
United Kingdom
Prior art keywords
pulp
weight
cellulosic
bleaching
dec
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
GB59738/68A
Inventor
Norman Liebergott
Henry Irving Bolker
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.)
Pulp and Paper Research Institute of Canada
Original Assignee
Pulp and Paper Research Institute of Canada
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 Pulp and Paper Research Institute of Canada filed Critical Pulp and Paper Research Institute of Canada
Priority to GB59738/68A priority Critical patent/GB1242709A/en
Priority to US882819A priority patent/US3619349A/en
Priority to SE17239/69A priority patent/SE365831B/xx
Priority to FI693632A priority patent/FI50644C/en
Priority to NO04945/69A priority patent/NO127544B/no
Publication of GB1242709A publication Critical patent/GB1242709A/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
    • D21C9/123—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with Cl2O

Landscapes

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

Abstract

1,242,709. Bleaching cellulosic pulp. PULP & PAPER RESEARCH INSTITUTE OF CANADA. 2 Dec., 1969 [16 Dec., 1968], No. 59738/68. Heading D1P. Fibrous cellulosic pulp, e.g. that obtained by the kraft and sulphite process is bleached by contacting a high consistency (i.e. of about 15% by weight) pulp in the form of fluffed or shredded fibres with gaseous chlorine monoxide. The pulp preferably has at least 15% by weight cellulosic content. Throughout the reaction, which may last for 1-60 minutes, the pH of the pulp is maintained in the range 3.5-5.5 and the temperature between 20‹C and 50‹C. Degradation in the viscosity of the pulp is reduced by including ammonia or sulphonic acid in the pulp, or up to 0.05% by weight chlorine dioxide in the chlorine monoxide. The chlorine monoxide may be diluted with a non-reactive gas, e.g. air to a partial pressure below 253 mm. of mercury.
GB59738/68A 1968-12-16 1968-12-16 Bleaching of cellulosic pulp Expired GB1242709A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB59738/68A GB1242709A (en) 1968-12-16 1968-12-16 Bleaching of cellulosic pulp
US882819A US3619349A (en) 1968-12-16 1969-12-08 Bleaching of shredded or fluffed cellulosic pulp with gaseous chlorine monoxide
SE17239/69A SE365831B (en) 1968-12-16 1969-12-15
FI693632A FI50644C (en) 1968-12-16 1969-12-15 Bleaching of cellulose pulp in gas phase with chlorine monoxide.
NO04945/69A NO127544B (en) 1968-12-16 1969-12-15

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB59738/68A GB1242709A (en) 1968-12-16 1968-12-16 Bleaching of cellulosic pulp

Publications (1)

Publication Number Publication Date
GB1242709A true GB1242709A (en) 1971-08-11

Family

ID=10484328

Family Applications (1)

Application Number Title Priority Date Filing Date
GB59738/68A Expired GB1242709A (en) 1968-12-16 1968-12-16 Bleaching of cellulosic pulp

Country Status (5)

Country Link
US (1) US3619349A (en)
FI (1) FI50644C (en)
GB (1) GB1242709A (en)
NO (1) NO127544B (en)
SE (1) SE365831B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA989112A (en) * 1972-05-30 1976-05-18 Pulp And Paper Research Institute Of Canada Bleaching of textiles with chlorine monoxide
US3907632A (en) * 1973-10-23 1975-09-23 Ppg Industries Inc Bleaching cellulosic pulps with gaseous chlorine at a pH of 7 to 10 in a multistage bleaching process
US3990843A (en) * 1974-08-05 1976-11-09 The Dow Chemical Company Method for bleaching raw cotton and cotton textiles
US20030056295A1 (en) * 2001-06-06 2003-03-27 Martin Ragnar Reduction of organically bound chlorine formed in chlorine dioxide bleaching
US20050045291A1 (en) * 2002-08-08 2005-03-03 Martin Ragnar Reduction of organically bound chlorine formed in chlorine dioxide bleaching
WO2012097380A1 (en) * 2011-01-14 2012-07-19 The Red Triangle, LLC Compositions and methods for bamboo pulping

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2178696A (en) * 1938-02-03 1939-11-07 Pittsburgh Plate Glass Co Material treatment
US3074842A (en) * 1959-07-24 1963-01-22 Dorr Oliver Inc Treatment of unbleached cellulose pulps

Also Published As

Publication number Publication date
NO127544B (en) 1973-07-09
US3619349A (en) 1971-11-09
FI50644B (en) 1976-02-02
FI50644C (en) 1976-05-10
SE365831B (en) 1974-04-01

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