NO850720L - MECHANICAL MASS PUMPING AND HYDROSULPHITE WHITING - Google Patents

MECHANICAL MASS PUMPING AND HYDROSULPHITE WHITING

Info

Publication number
NO850720L
NO850720L NO850720A NO850720A NO850720L NO 850720 L NO850720 L NO 850720L NO 850720 A NO850720 A NO 850720A NO 850720 A NO850720 A NO 850720A NO 850720 L NO850720 L NO 850720L
Authority
NO
Norway
Prior art keywords
pulp
bleaching
pump
hydrosulfite
hydrosulphite
Prior art date
Application number
NO850720A
Other languages
Norwegian (no)
Other versions
NO164310C (en
NO164310B (en
Inventor
Louis Otto Torregrossa
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 NO850720L publication Critical patent/NO850720L/en
Publication of NO164310B publication Critical patent/NO164310B/en
Publication of NO164310C publication Critical patent/NO164310C/en

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/26—De-aeration of paper stock
    • 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
    • D21C9/1084—Bleaching ; Apparatus therefor with reducing compounds
    • D21C9/1089—Bleaching ; Apparatus therefor with reducing compounds with dithionites

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Detergent Compositions (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Catalysts (AREA)
  • Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

A medium consistency mechanical pulp (e.g. RMP, CMP, TMP, CTMP or stone groundwood) is treated to effect efficient reductive bleaching. The pulp, at about 8-15% consistency is simultaneously pumped and degassed utilizing a fluidizing pump (13), and by controlling the pump head to maximize deaeration. The pulp may be immediately passed -- without air introduction -- to a fluidizing mixer (28), where it is mixed with hydrosulfite (dithionite) bleaching chemical. Alternatively, the hydrosulfite may be added directly to the discharge (25) or suction (14) of the pump, and the mixer eliminated. After chemical addition, the pulp is retained at predetermined pH and temperature conditions for a predetermined period of time to effect the desired bleaching, as in an upflow tower (31).
NO850720A 1984-03-05 1985-02-22 PROCEDURE FOR THE TREATMENT OF A MECHANICAL MASS WITH HYDROSULPHITE-BLEACH CHEMICALS. NO164310C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US58593884A 1984-03-05 1984-03-05

Publications (3)

Publication Number Publication Date
NO850720L true NO850720L (en) 1985-09-06
NO164310B NO164310B (en) 1990-06-11
NO164310C NO164310C (en) 1990-09-19

Family

ID=24343611

Family Applications (1)

Application Number Title Priority Date Filing Date
NO850720A NO164310C (en) 1984-03-05 1985-02-22 PROCEDURE FOR THE TREATMENT OF A MECHANICAL MASS WITH HYDROSULPHITE-BLEACH CHEMICALS.

Country Status (7)

Country Link
EP (1) EP0155928B1 (en)
JP (1) JPS60209088A (en)
AT (1) ATE38258T1 (en)
BR (1) BR8500938A (en)
DE (1) DE3565870D1 (en)
FI (1) FI77905C (en)
NO (1) NO164310C (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE68928632T2 (en) * 1988-02-26 1998-07-30 Ahlstroem Oy Process and apparatus for treating pulp
US4877368A (en) * 1988-11-08 1989-10-31 A. Ahlstrom Corporation Fluidizing centrifugal pump
FI94440C (en) * 1990-08-14 1995-09-11 Ahlstroem Oy Process and plant for treating air and / or gas-containing liquid or fiber suspension and use of a gas separating pulp pump
SE513790C2 (en) * 1999-03-08 2000-11-06 Mo Och Domsjoe Ab Bleaching of mechanical pulp with reducing bleach
DE60301446T2 (en) 2002-06-28 2006-06-14 Rohm & Haas Process for brightening pulp with hydrosulfite solution

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2071307A (en) * 1936-08-11 1937-02-16 Great Western Electro Chemical Co Bleaching
US2707146A (en) * 1951-08-08 1955-04-26 Scott Paper Co Method of bleaching mechanically disintegrated wood pulp
US2963395A (en) * 1958-03-31 1960-12-06 Crown Zellerbach Corp Process of bleaching lignocellulosic pulps
NO117673B (en) * 1962-02-14 1969-09-08 Svenska Cellulosa Ab
US4030969A (en) * 1972-06-13 1977-06-21 Defibrator Ab Method of dispersing a bleaching agent into a stream of fibrous cellulosic pulp material in a throttling nozzle
SE389351B (en) * 1975-03-14 1976-11-01 Kamyr Ab METHOD AND DEVICE FOR DISTRIBUTION AND MIXTURE OF GAS AND / OR LIQUID IN MASS CONCENTRATIONS OF HIGH CONCENTRATION.
US4410337A (en) * 1980-04-07 1983-10-18 A. Ahlstrom Osakeyhtio Method and an apparatus for separating a gas from a fibre suspension
US4435193A (en) * 1980-04-07 1984-03-06 Kamyr Ab Controlling operation of a centrifugal pump

Also Published As

Publication number Publication date
BR8500938A (en) 1985-10-22
EP0155928B1 (en) 1988-10-26
FI77905B (en) 1989-01-31
ATE38258T1 (en) 1988-11-15
NO164310C (en) 1990-09-19
FI850854L (en) 1985-09-06
FI77905C (en) 1989-05-10
DE3565870D1 (en) 1988-12-01
EP0155928A1 (en) 1985-09-25
NO164310B (en) 1990-06-11
JPS60209088A (en) 1985-10-21
FI850854A0 (en) 1985-03-01

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