EP0303962A3 - Oxygen alkali extraction process for producing bleached pulp - Google Patents

Oxygen alkali extraction process for producing bleached pulp Download PDF

Info

Publication number
EP0303962A3
EP0303962A3 EP19880113019 EP88113019A EP0303962A3 EP 0303962 A3 EP0303962 A3 EP 0303962A3 EP 19880113019 EP19880113019 EP 19880113019 EP 88113019 A EP88113019 A EP 88113019A EP 0303962 A3 EP0303962 A3 EP 0303962A3
Authority
EP
European Patent Office
Prior art keywords
pulp
alkali extraction
extraction process
oxygen
bleached pulp
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.)
Withdrawn
Application number
EP19880113019
Other languages
German (de)
French (fr)
Other versions
EP0303962A2 (en
Inventor
John Federick Cirucci
Augustine Ivanhoe Dalton
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 EP0303962A2 publication Critical patent/EP0303962A2/en
Publication of EP0303962A3 publication Critical patent/EP0303962A3/en
Withdrawn legal-status Critical Current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

Abstract

Oxygen alkali extraction of pulp in a multi-stage bleaching sequence is accomplished in the absence of a dynamic mixer for mixing oxygen with pulp yet obtaining desired pulp brightness and/or reduced chlorine-based chemical consumption, by intimately mixing oxygen with the alkaline pulp at a point before or within the alkaline pulp bleaching stage of the se­ quence, in the presence of a co-oxidant.
EP19880113019 1987-08-17 1988-08-10 Oxygen alkali extraction process for producing bleached pulp Withdrawn EP0303962A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US8632487A 1987-08-17 1987-08-17
US86324 1987-08-17

Publications (2)

Publication Number Publication Date
EP0303962A2 EP0303962A2 (en) 1989-02-22
EP0303962A3 true EP0303962A3 (en) 1991-06-26

Family

ID=22197825

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880113019 Withdrawn EP0303962A3 (en) 1987-08-17 1988-08-10 Oxygen alkali extraction process for producing bleached pulp

Country Status (4)

Country Link
EP (1) EP0303962A3 (en)
JP (1) JPS6485387A (en)
BR (1) BR8804126A (en)
FI (1) FI883811A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4568420A (en) * 1984-12-03 1986-02-04 International Paper Company 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

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4568420A (en) * 1984-12-03 1986-02-04 International Paper Company Multi-stage bleaching process including an enhanced oxidative extraction stage
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
FI883811A (en) 1989-02-18
EP0303962A2 (en) 1989-02-22
JPS6485387A (en) 1989-03-30
BR8804126A (en) 1989-03-07
FI883811A0 (en) 1988-08-17

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