SE8803705L - OXYGEN WHITING - Google Patents

OXYGEN WHITING

Info

Publication number
SE8803705L
SE8803705L SE8803705A SE8803705A SE8803705L SE 8803705 L SE8803705 L SE 8803705L SE 8803705 A SE8803705 A SE 8803705A SE 8803705 A SE8803705 A SE 8803705A SE 8803705 L SE8803705 L SE 8803705L
Authority
SE
Sweden
Prior art keywords
delignification zone
temperature
pulp
delignification
zone
Prior art date
Application number
SE8803705A
Other languages
Swedish (sv)
Other versions
SE467582B (en
SE8803705D0 (en
Inventor
Kauko Turunen
Original Assignee
Kamyr Ab
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 Ab filed Critical Kamyr Ab
Priority to SE8803705A priority Critical patent/SE467582B/en
Publication of SE8803705D0 publication Critical patent/SE8803705D0/en
Priority to CA000614212A priority patent/CA1337843C/en
Priority to JP1269259A priority patent/JPH02145883A/en
Priority to FI894949A priority patent/FI91896C/en
Publication of SE8803705L publication Critical patent/SE8803705L/en
Priority to US07/857,121 priority patent/US5217575A/en
Publication of SE467582B publication Critical patent/SE467582B/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
    • D21C9/147—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications

Abstract

A process for oxygen bleaching fibrous cellulose pulp is described in which the pulp passes a first delignification zone with a predetermined low temperature and a second delignification zone with a predetermined high temperature which is higher than that in the first delignification zone. The pulp is fed through a first vertical reactor containing said first delignification zone with low temperature, and thereafter through a second vertical reactor containing said second delignification zone with high temperature. The temperature in the first delignification zone is either maintained at the temperature that the pulp entering for bleaching has acquired during a previous treatment before the oxygen bleaching, or as required is adjusted by the controlled supply of steam to a mixer disposed in the pipe before the first reactor. The temperature in the second delignification zone is adjusted by the controlled supply of steam to a mixer disposed in the pipe between the two reactors.
SE8803705A 1988-10-18 1988-10-18 OXYGEN WHITING SE467582B (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
SE8803705A SE467582B (en) 1988-10-18 1988-10-18 OXYGEN WHITING
CA000614212A CA1337843C (en) 1988-10-18 1989-09-28 Process for oxygen bleaching
JP1269259A JPH02145883A (en) 1988-10-18 1989-10-18 Bleaching process with oxygen of fibrous cellulose pulp
FI894949A FI91896C (en) 1988-10-18 1989-10-18 Method of oxygen bleaching
US07/857,121 US5217575A (en) 1988-10-18 1992-03-24 Process for oxygen bleaching using two vertical reactors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE8803705A SE467582B (en) 1988-10-18 1988-10-18 OXYGEN WHITING

Publications (3)

Publication Number Publication Date
SE8803705D0 SE8803705D0 (en) 1988-10-18
SE8803705L true SE8803705L (en) 1990-04-19
SE467582B SE467582B (en) 1992-08-10

Family

ID=20373661

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8803705A SE467582B (en) 1988-10-18 1988-10-18 OXYGEN WHITING

Country Status (4)

Country Link
JP (1) JPH02145883A (en)
CA (1) CA1337843C (en)
FI (1) FI91896C (en)
SE (1) SE467582B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE510740C2 (en) * 1996-11-26 1999-06-21 Sunds Defibrator Ind Ab Oxygen delignification control
SE522593C2 (en) * 1999-07-06 2004-02-24 Kvaerner Pulping Tech Oxygen gas delignification system and method of pulp of lignocellulosic material
RU2479619C2 (en) * 2009-11-17 2013-04-20 Феликс Фердинандович Аухадеев Pulsation apparatus for delignification of cellulose-containing plant material and method for operation thereof

Also Published As

Publication number Publication date
FI91896C (en) 1994-08-25
JPH02145883A (en) 1990-06-05
CA1337843C (en) 1996-01-02
SE467582B (en) 1992-08-10
FI894949A0 (en) 1989-10-18
SE8803705D0 (en) 1988-10-18
FI91896B (en) 1994-05-13

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