GB1452710A - Method for bleaching of material containing cellulose - Google Patents

Method for bleaching of material containing cellulose

Info

Publication number
GB1452710A
GB1452710A GB5403874A GB5403874A GB1452710A GB 1452710 A GB1452710 A GB 1452710A GB 5403874 A GB5403874 A GB 5403874A GB 5403874 A GB5403874 A GB 5403874A GB 1452710 A GB1452710 A GB 1452710A
Authority
GB
United Kingdom
Prior art keywords
pulp
oxygen
foam
sodium hydroxide
foaming agent
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
GB5403874A
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.)
Ahlstrom Corp
Original Assignee
Ahlstrom 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 Ahlstrom Corp filed Critical Ahlstrom Corp
Publication of GB1452710A publication Critical patent/GB1452710A/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
    • D21C9/147—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications
    • 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

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Conductive Materials (AREA)
  • Pigments, Carbon Blacks, Or Wood Stains (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

1452710 Bleaching wood pulp A AHLSTROM OSAKEYHTIO 13 Dec 1974 [20 Dec 1973] 54038/74 Heading DIP A foamed suspension of wood pulp is bleached to remove lignine by treating with alkali solution and oxidising gas at elevated temperature and pressure. The foam is stabilised with 1 kg/ton of pulp of a foaming agent (a polyoxyalkylene-condensate, dodecylbenzene sulphonate, octylphenoxypolyethoxy ethanol or black liquor. The oxidising gas may be oxygen, air, ozone, chlorine, chlorine dioxide or mixtures thereof. Pulp is digested at 1 and washed to remove most of the black liquor. The pulp, oxygen gas and foaming agent are mixed at 3 and sodium hydroxide solution, oxygen and steam added to reactor 8. A pressure reducing valve may be situated between mixer 3 and reactor 8 to expand the bubbles in the foam. The amount of pulp in the foam is up to 15% by wt., e.g. 8 or 10%. The sodium hydroxide may comprise 6% by weight. Specified reactor conditions are temperature 90 or 110‹C, pressure 4 atmospheres for 10 to 30 minutes. The bleached pulp is degassified at 11 and washed at 10. Kappa valves of 14 to 16.5 are obtained. In the embodiment of Fig. 2, not shown the sodium hydroxide and the foaming agent are applied to the pulp simultaneously and then the oxygen is applied.
GB5403874A 1973-12-20 1974-12-13 Method for bleaching of material containing cellulose Expired GB1452710A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7317221A SE390549C (en) 1973-12-20 1973-12-20 SET TO BLOW CELLULOSIC MATERIAL WITH ACID OR FREE ACID CONTAINING GAS IN ALKALIC ENVIRONMENT

Publications (1)

Publication Number Publication Date
GB1452710A true GB1452710A (en) 1976-10-13

Family

ID=20319462

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5403874A Expired GB1452710A (en) 1973-12-20 1974-12-13 Method for bleaching of material containing cellulose

Country Status (12)

Country Link
JP (1) JPS524643B2 (en)
BR (1) BR7410652D0 (en)
CA (1) CA1065105A (en)
DE (1) DE2460144B2 (en)
FI (1) FI52878C (en)
FR (1) FR2255419B1 (en)
GB (1) GB1452710A (en)
IT (1) IT1027773B (en)
NO (1) NO142128C (en)
SE (1) SE390549C (en)
SU (1) SU850019A3 (en)
ZA (1) ZA747918B (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS563214Y2 (en) * 1978-05-15 1981-01-24
US4209359A (en) * 1978-10-23 1980-06-24 International Paper Company Process for removing residual oxygen from oxygen-bleached pulp
SE462919B (en) * 1979-05-11 1990-09-17 Sunds Defibrator Ind Ab PROCEDURE TO PERFORM ALKALIE EXTRACTION OF CELLULOSAMASS IN THE PRESENCE OF ACID
US4574032A (en) * 1979-10-15 1986-03-04 Westvaco Corporation Process for delignification of lignocellulosic material in the presence of anthraquinone in solution with white and black liquors
SE452896B (en) * 1985-01-24 1987-12-21 Aga Ab METHOD OF TREATING CELLULOSAMASSOR
SE460202B (en) * 1987-03-13 1989-09-18 Aga Ab SEATED AS TREATMENT OF A MATERIAL WITH A GAS IN A SCIENCE
FI89516B (en) * 1989-05-10 1993-06-30 Ahlstroem Oy Foerfarande Foer blekning av cellulosamassa med Otson
US5460696A (en) * 1993-08-12 1995-10-24 The Boc Group, Inc. Oxygen delignification method incorporating wood pulp mixing apparatus

Also Published As

Publication number Publication date
NO744609L (en) 1975-07-14
IT1027773B (en) 1978-12-20
NO142128C (en) 1980-07-02
SE390549B (en) 1976-12-27
CA1065105A (en) 1979-10-30
DE2460144B2 (en) 1977-03-03
SU850019A3 (en) 1981-07-23
FI370274A (en) 1975-06-21
JPS5094202A (en) 1975-07-26
SE7317221L (en) 1975-06-23
FR2255419A1 (en) 1975-07-18
NO142128B (en) 1980-03-24
BR7410652D0 (en) 1975-09-02
FR2255419B1 (en) 1979-06-01
SE390549C (en) 1986-04-14
FI52878B (en) 1977-08-31
FI52878C (en) 1987-09-24
ZA747918B (en) 1975-12-31
JPS524643B2 (en) 1977-02-05
DE2460144A1 (en) 1975-07-03

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee