FI850854L - PUMPNING OCH VAETESULFITBLEKNING AV MEKANISK MASSA. - Google Patents

PUMPNING OCH VAETESULFITBLEKNING AV MEKANISK MASSA.

Info

Publication number
FI850854L
FI850854L FI850854A FI850854A FI850854L FI 850854 L FI850854 L FI 850854L FI 850854 A FI850854 A FI 850854A FI 850854 A FI850854 A FI 850854A FI 850854 L FI850854 L FI 850854L
Authority
FI
Finland
Prior art keywords
pulp
bleaching
pump
hydrosulfite
vaetesulfitblekning
Prior art date
Application number
FI850854A
Other languages
Finnish (fi)
Other versions
FI77905B (en
FI77905C (en
FI850854A0 (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 FI850854A0 publication Critical patent/FI850854A0/en
Publication of FI850854L publication Critical patent/FI850854L/en
Publication of FI77905B publication Critical patent/FI77905B/en
Application granted granted Critical
Publication of FI77905C publication Critical patent/FI77905C/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).
FI850854A 1984-03-05 1985-03-01 Pumping and hydrogen sulphite bleaching of mechanical pulp. FI77905C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US58593884A 1984-03-05 1984-03-05
US58593884 1984-03-05

Publications (4)

Publication Number Publication Date
FI850854A0 FI850854A0 (en) 1985-03-01
FI850854L true FI850854L (en) 1985-09-06
FI77905B FI77905B (en) 1989-01-31
FI77905C FI77905C (en) 1989-05-10

Family

ID=24343611

Family Applications (1)

Application Number Title Priority Date Filing Date
FI850854A FI77905C (en) 1984-03-05 1985-03-01 Pumping and hydrogen sulphite bleaching of mechanical pulp.

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
NO850720L (en) 1985-09-06
EP0155928B1 (en) 1988-10-26
FI77905B (en) 1989-01-31
ATE38258T1 (en) 1988-11-15
NO164310C (en) 1990-09-19
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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Legal Events

Date Code Title Description
MM Patent lapsed
MM Patent lapsed

Owner name: KAMYR, INC.