FI862082A - TRYCKKLORERING AV MASS OCH INMATNING AV KLOR I FORM AV MYCKET SMAO BUBBLOR. - Google Patents

TRYCKKLORERING AV MASS OCH INMATNING AV KLOR I FORM AV MYCKET SMAO BUBBLOR. Download PDF

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Publication number
FI862082A
FI862082A FI862082A FI862082A FI862082A FI 862082 A FI862082 A FI 862082A FI 862082 A FI862082 A FI 862082A FI 862082 A FI862082 A FI 862082A FI 862082 A FI862082 A FI 862082A
Authority
FI
Finland
Prior art keywords
mixer
treatment
pulp
chlorine gas
retention vessel
Prior art date
Application number
FI862082A
Other languages
Finnish (fi)
Other versions
FI862082A0 (en
FI85728B (en
FI85728C (en
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
Publication of FI862082A0 publication Critical patent/FI862082A0/en
Publication of FI862082A publication Critical patent/FI862082A/en
Publication of FI85728B publication Critical patent/FI85728B/en
Application granted granted Critical
Publication of FI85728C publication Critical patent/FI85728C/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

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).
FI862082A 1985-06-14 1986-05-19 Pressure chlorination of pulp and input of chlorine in the form of very small bubbles FI85728C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US74467885A 1985-06-14 1985-06-14
US74467885 1985-06-14

Publications (4)

Publication Number Publication Date
FI862082A0 FI862082A0 (en) 1986-05-19
FI862082A true FI862082A (en) 1986-12-15
FI85728B FI85728B (en) 1992-02-14
FI85728C FI85728C (en) 1992-05-25

Family

ID=24993592

Family Applications (1)

Application Number Title Priority Date Filing Date
FI862082A FI85728C (en) 1985-06-14 1986-05-19 Pressure chlorination of pulp and input of chlorine in the form of very small 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
EP0207062B1 (en) 1989-12-06
ATE48452T1 (en) 1989-12-15
SE466459B (en) 1992-02-17
NO168123B (en) 1991-10-07
CA1276408C (en) 1990-11-20
SE8602592L (en) 1986-12-15
NO168123C (en) 1992-01-15
SE8602592D0 (en) 1986-06-10
DE3667310D1 (en) 1990-01-11
FI862082A0 (en) 1986-05-19
FI85728B (en) 1992-02-14
FI85728C (en) 1992-05-25
BR8602738A (en) 1987-02-10
EP0207062A1 (en) 1986-12-30
NO862116L (en) 1986-12-15

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Legal Events

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MM Patent lapsed
MM Patent lapsed

Owner name: KAMYR INC.