GB1343126A - Bleaching of lignocellulosic material - Google Patents

Bleaching of lignocellulosic material

Info

Publication number
GB1343126A
GB1343126A GB73371A GB73371A GB1343126A GB 1343126 A GB1343126 A GB 1343126A GB 73371 A GB73371 A GB 73371A GB 73371 A GB73371 A GB 73371A GB 1343126 A GB1343126 A GB 1343126A
Authority
GB
United Kingdom
Prior art keywords
vessel
pulp
oxygen
lignocellulosic
continuously
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
GB73371A
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.)
PPG Architectural Coatings Canada Inc
Original Assignee
Canadian Industries Ltd
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 Canadian Industries Ltd filed Critical Canadian Industries Ltd
Publication of GB1343126A publication Critical patent/GB1343126A/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

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Branching, Merging, And Special Transfer Between Conveyors (AREA)

Abstract

1343126 Bleaching of lignocellulosic material CANADIAN INDUSTRIES Ltd 7 Jan 1971 [8 Jan 1970] 733/71 Headings D1L and D1P A process for treating lignocellulosic material comprises the steps of (1) continuously introducing an aqueous lignocellulosic pulp to a pressure vessel, (2) admixing the pulp with an aqueous solution or suspension of an alkaline material, (3) contacting the alkaline pulp in the reacting vessel with oxygen or an oxygen containing gas at supra-atmospheric pressure and elevated temperature and (4) continuously withdrawing the oxygen treated pulp from the pressurised reaction vessel, the introduction and withdrawal of the pulp from the reaction vessel taking place continuously while the vessel is maintained under supra-atmospheric pressure. The oxygen containing gas may be air and the alkaline material may be sodium hydroxide, sodium carbonate, calcium hydroxide or a mixture of calcium hydroxide and magnesium hydroxide. An apparatus for carrying out the continuous treatment of lignocellulosic material with oxygen or an oxygencontaining gas comprises (1) a pressure vessel 6, (2) means 11 for supplying oxygen, or an oxygen containing gas to the vessel under supra-atmospheric pressure (3) means 4, 5 for introducing continuously aqueous lignocellulosic pulp into the vessel 6 (4) means, 11, for supplying alkaline reagent to the vessel, (5) means, 10, for heating the contents of the reaction vessel, (6) means 12, for agitating the contents of the pressure vessel so as to renew continuously the interface between the lignocellulosic pulp and the gas (7) means for controlling the residence time of the lignocellulosic pulp in the reaction vessel and (8) means 20, for withdrawing continuously oxygen treated lignocellulosic pulp from the pressurised vessel. Instead of the rotary pocket valve, 5, a high density pump can be used and the rotary pocket valve 20 can be replaced by a butterfly or grate. In another embodiment there may be provided means for controlling the partial pressure of the oxygen in the vessel. The pressure vessel which may be multi-compartmented is provided with mechanical agitators in each compartment, a plurality of perforated plate air dispersing members and draft tube air dispersing members. The vessel may be toroidal in shape and in the case of a single compartment vessel there may be provided means for dispersing oxygen or an oxygencontaining gas which is adopted to mix the contents of the vessel. In a further embodiment there is provided means for recirculating alkaline aqueous liquor separated from the lignocellulosic pulp withdrawn for the vessel.
GB73371A 1970-01-08 1971-01-07 Bleaching of lignocellulosic material Expired GB1343126A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA71726 1970-01-08

Publications (1)

Publication Number Publication Date
GB1343126A true GB1343126A (en) 1974-01-10

Family

ID=4086157

Family Applications (1)

Application Number Title Priority Date Filing Date
GB73371A Expired GB1343126A (en) 1970-01-08 1971-01-07 Bleaching of lignocellulosic material

Country Status (11)

Country Link
US (1) US3754417A (en)
AT (1) AT305015B (en)
AU (1) AU2323070A (en)
BR (1) BR7025003D0 (en)
CA (1) CA918978A (en)
DE (1) DE2100703A1 (en)
FI (1) FI52746C (en)
FR (1) FR2075111A5 (en)
GB (1) GB1343126A (en)
NO (1) NO130068B (en)
ZA (1) ZA708365B (en)

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3830473A (en) * 1973-02-22 1974-08-20 Standard Brands Inc Starch paste apparatus
US4079603A (en) * 1973-10-16 1978-03-21 Niels Bergholtz & Company K/B Apparatus for liquid treatment, particularly for textile material dyeing
US4062722A (en) * 1974-01-18 1977-12-13 Carlos Ibanez Ajuria Device for treating deformable particles with the counterflowing liquids
NO138491B (en) * 1974-04-17 1978-06-05 Per Kock Christensen PROCEDURES FOR DELIGNIFICATION AND BLEACHING OF CELLULOSIS
FI58360C (en) * 1974-06-14 1981-01-12 Mo Och Domsjoe Ab FOERFARANDE FOER DELIGNIFIERING AV LIGNOCELLULOSAHALTIGT MATERIAL MED HJAELP AV SYREINNEHAOLLANDE GAS OCH APPARATUR FOER UTFOERANDE AV DETTA FOERFARANDE
JPS5126302A (en) * 1974-08-22 1976-03-04 Hitachi Shipbuilding Eng Co Sansoganjugasunyoru seruroosubutsushitsuno shorihoho
US3966542A (en) * 1974-09-20 1976-06-29 General Signal Corporation Multi-stage bleaching of pulp using successively lower power levels
US4048007A (en) * 1975-05-14 1977-09-13 The Dow Chemical Company Method of removing solvent residues from aqueous paper pulps
SU591539A1 (en) * 1975-10-03 1978-02-05 Всесоюзное научно-производственное объединение целлюлозно-бумажной промышленности Lignocellulose material treatment plant
NO137651C (en) * 1975-10-31 1978-03-29 Myrens Verksted As PROCEDURE AND APPARATUS FOR CONTINUOUS TREATMENT OF FINDEL FIBER MATERIAL OR CELLULOSIZED MASS WITH GAS WITHOUT COVER.
US4198266A (en) * 1977-10-12 1980-04-15 Airco, Inc. Oxygen delignification of wood pulp
US4259150A (en) * 1978-12-18 1981-03-31 Kamyr Inc. Plural stage mixing and thickening oxygen bleaching process
US4435249A (en) 1979-09-05 1984-03-06 The Black Clawson Co. Process for the oxygen delignification of pulp mill rejects
US4363697A (en) * 1979-12-03 1982-12-14 The Black Clawson Company Method for medium consistency oxygen delignification of pulp
ZA816105B (en) * 1980-09-05 1982-09-29 Black Clawson Co Process and apparatus for the delignification of pulp
US4405063A (en) * 1981-02-27 1983-09-20 Nordson Corporation Method and apparatus for controlling the density of dispensed hot melt thermoplastic adhesive foam
ZA821923B (en) * 1981-04-06 1983-02-23 Black Clawson Co Method and apparatus for oxygen delignification
US4384920A (en) * 1981-04-06 1983-05-24 The Black Clawson Company Method and apparatus for oxygen delignification
US6340409B1 (en) * 1993-04-29 2002-01-22 Lewis Donald Shackford Method for multistage bleaching using gaseous reagent in the first stage with controlled gas release
SE9402542D0 (en) * 1994-07-20 1994-07-20 Kvaerner Pulping Tech Method and apparatus for bleaching with pressurized peroxide
DE19626200C2 (en) * 1996-06-29 2001-02-01 Voith Sulzer Stoffaufbereitung Process for increasing the whiteness of waste paper pulp
US6153050A (en) * 1998-03-24 2000-11-28 Noranda Forest Inc. Method and system for controlling the addition of bleaching reagents to obtain a substantially constant percentage of pulp delignification across the first bleaching/delignifying stage
US7163334B2 (en) * 2000-03-13 2007-01-16 The University Of Akron Method and apparatus for mixing fibers
US9512560B2 (en) * 2014-10-31 2016-12-06 Quantum Technologies, Inc. Short oxygen delignification method

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1044185A (en) * 1908-05-01 1912-11-12 Eugene D Jefferson Bleaching apparatus.
US2121324A (en) * 1936-06-23 1938-06-21 Texas Co Liquid level control apparatus
US2730888A (en) * 1952-12-31 1956-01-17 Hercules Powder Co Ltd Apparatus for treating pulp with liquid
US3130076A (en) * 1961-09-29 1964-04-21 American Cyanamid Co Continuous vinyl grafting of cellulose
US3134384A (en) * 1963-05-20 1964-05-26 Improved Machinery Inc Downflow countercurrent washing apparatus
CA834629A (en) * 1966-09-30 1970-02-17 Amiel W. Brinkley, Jr. Rapid high consistency bleaching of pulp
US3587257A (en) * 1967-10-16 1971-06-28 Stadler Hurter International L Bleaching system including a single,triple-deck table washer

Also Published As

Publication number Publication date
FR2075111A5 (en) 1971-10-08
ZA708365B (en) 1972-07-26
AU2323070A (en) 1972-06-15
US3754417A (en) 1973-08-28
AT305015B (en) 1973-02-12
DE2100703A1 (en) 1971-07-15
FI52746B (en) 1977-08-01
FI52746C (en) 1977-11-10
CA918978A (en) 1973-01-16
BR7025003D0 (en) 1973-01-18
NO130068B (en) 1974-07-01

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Legal Events

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