JPS6485387A - Delignification and bleaching of pulp - Google Patents

Delignification and bleaching of pulp

Info

Publication number
JPS6485387A
JPS6485387A JP63204550A JP20455088A JPS6485387A JP S6485387 A JPS6485387 A JP S6485387A JP 63204550 A JP63204550 A JP 63204550A JP 20455088 A JP20455088 A JP 20455088A JP S6485387 A JPS6485387 A JP S6485387A
Authority
JP
Japan
Prior art keywords
pulp
alkali
bleaching
extraction process
sequence
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
JP63204550A
Other languages
Japanese (ja)
Inventor
Furederitsuku Shirutsuch Jiyon
Aibanhoo Daruton Augusuchin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Air Products and Chemicals Inc
Original Assignee
Air Products and Chemicals 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 Air Products and Chemicals Inc filed Critical Air Products and Chemicals Inc
Publication of JPS6485387A publication Critical patent/JPS6485387A/en
Pending legal-status Critical Current

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
    • D21C9/1026—Other features in bleaching processes

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)

Abstract

PURPOSE: To reduce the necessary amount of a blending agent by bringing oxygen into contact with an alkali pulp under a specific condition when an alkali extraction process is inserted in a multi-stage bleaching sequence. CONSTITUTION: When an alkali extraction process is inserted in a sequence for treating a pulp with various delignifying agents and a bleaching agent, the pulp is alkalinized and an oxygen-containing gas is introduced into the alkali pulp without using a dynamic mixer. The operation is carried out in the presence of an additive cooxidant selected from the group consisting of an alkaline earth metal hypochlorite, chlorine and hydrogen peroxide.
JP63204550A 1987-08-17 1988-08-17 Delignification and bleaching of pulp Pending JPS6485387A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US8632487A 1987-08-17 1987-08-17

Publications (1)

Publication Number Publication Date
JPS6485387A true JPS6485387A (en) 1989-03-30

Family

ID=22197825

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63204550A Pending JPS6485387A (en) 1987-08-17 1988-08-17 Delignification and bleaching of pulp

Country Status (4)

Country Link
EP (1) EP0303962A3 (en)
JP (1) JPS6485387A (en)
BR (1) BR8804126A (en)
FI (1) FI883811A7 (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4568420B1 (en) * 1984-12-03 1999-03-02 Int Paper Co Multi-stage bleaching process including an enhanced oxidative extraction stage
US4657633A (en) * 1985-05-24 1987-04-14 Westvaco Corporation Delignification and bleaching of a cellulose pulp with an alkalioxygen-hypochlorite single stage sequential extraction

Also Published As

Publication number Publication date
EP0303962A2 (en) 1989-02-22
FI883811L (en) 1989-02-18
FI883811A0 (en) 1988-08-17
EP0303962A3 (en) 1991-06-26
BR8804126A (en) 1989-03-07
FI883811A7 (en) 1989-02-18

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