ATE48452T1 - CHLORINATION OF PULP UNDER PRESSURE AND INTRODUCTION OF CHLORINE IN BUBBLES. - Google Patents

CHLORINATION OF PULP UNDER PRESSURE AND INTRODUCTION OF CHLORINE IN BUBBLES.

Info

Publication number
ATE48452T1
ATE48452T1 AT86890168T AT86890168T ATE48452T1 AT E48452 T1 ATE48452 T1 AT E48452T1 AT 86890168 T AT86890168 T AT 86890168T AT 86890168 T AT86890168 T AT 86890168T AT E48452 T1 ATE48452 T1 AT E48452T1
Authority
AT
Austria
Prior art keywords
chlorine
pulp
mixer
treatment
chlorine gas
Prior art date
Application number
AT86890168T
Other languages
German (de)
Inventor
Michael I Sherman
Joseph R Phillips
Gordon Rowlandson
Original Assignee
Kamyr 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 Kamyr Inc filed Critical Kamyr Inc
Application granted granted Critical
Publication of ATE48452T1 publication Critical patent/ATE48452T1/en

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

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Apparatus Associated With Microorganisms And Enzymes (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • External Artificial Organs (AREA)
  • Materials For Medical Uses (AREA)
  • Treating Waste Gases (AREA)
  • Treatment Of Sludge (AREA)

Abstract

A method and apparatus are provided for increasing the efficiency of treatment of a paper pulp slurry with chlorine gas, such as in the bleaching or delignification of deciduous wood chemical pulps, coniferous wood chemical pulps, and non-wood fibrous chemical pulps. Chlorine gas is intimately mixed with the pulp in a fluidizing mixer (14), the pulp preferably having a consistency of about 7-12%, and then is passed to a retention vessel (20). The discharge of pulp from the mixer to the retention vessel, and from the retention vessel to other treatment structures, is throttled by valves (30, 31) so as to increase the pressure in both the mixer and the retention vessel to above atmospheric, and preferably in the range of about 15-150 psig (1 to 10 bar above atmospheric pressure). The chlorine gas is added to the mixer through one more discs (53) of porous materials having pore sizes in the range of about 5-175 microns, such as porous ceramic or sintered metal discs. The increased pressure during the chlorine treatment, and the introduction of the chlorine gas in the form of minute bubbles, improve the solubility of the chlorine in the pulp slurry and thereby increase the efficiency of treatment. (Figure 1).
AT86890168T 1985-06-14 1986-06-06 CHLORINATION OF PULP UNDER PRESSURE AND INTRODUCTION OF CHLORINE IN BUBBLES. ATE48452T1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US74467885A 1985-06-14 1985-06-14
EP86890168A EP0207062B1 (en) 1985-06-14 1986-06-06 Pressurized pulp chlorination, and chlorine introduction in minute bubbles

Publications (1)

Publication Number Publication Date
ATE48452T1 true ATE48452T1 (en) 1989-12-15

Family

ID=24993592

Family Applications (1)

Application Number Title Priority Date Filing Date
AT86890168T ATE48452T1 (en) 1985-06-14 1986-06-06 CHLORINATION OF PULP UNDER PRESSURE AND INTRODUCTION OF CHLORINE IN BUBBLES.

Country Status (9)

Country Link
EP (1) EP0207062B1 (en)
JP (1) JPS61289192A (en)
AT (1) ATE48452T1 (en)
BR (1) BR8602738A (en)
CA (1) CA1276408C (en)
DE (1) DE3667310D1 (en)
FI (1) FI85728C (en)
NO (1) NO168123C (en)
SE (1) SE466459B (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US56833A (en) * 1866-07-31 Improvement in bleaching paper-stock
US1971241A (en) * 1933-04-01 1934-08-21 Pennsylvania Salt Mfg Co Method of chlorination
DE1621684A1 (en) * 1967-10-04 1971-07-08 Bellmer Geb Kg Maschf Machine combination for the line section in pulp processing plants
SE387671B (en) * 1973-04-27 1976-09-13 Mo Och Domsjoe Ab COMPACT WHITE BLEACHING, NON-FLUFFAT LIQUID LIGNOCELLULOSE MATERIAL WITH GASY BLEACHING, PREFERABLY ACID GAS

Also Published As

Publication number Publication date
JPS61289192A (en) 1986-12-19
CA1276408C (en) 1990-11-20
FI862082A (en) 1986-12-15
SE466459B (en) 1992-02-17
DE3667310D1 (en) 1990-01-11
SE8602592D0 (en) 1986-06-10
FI85728C (en) 1992-05-25
EP0207062B1 (en) 1989-12-06
NO168123C (en) 1992-01-15
SE8602592L (en) 1986-12-15
NO862116L (en) 1986-12-15
FI862082A0 (en) 1986-05-19
FI85728B (en) 1992-02-14
EP0207062A1 (en) 1986-12-30
BR8602738A (en) 1987-02-10
NO168123B (en) 1991-10-07

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Legal Events

Date Code Title Description
UEP Publication of translation of european patent specification
REN Ceased due to non-payment of the annual fee