EP0377981A3 - Process for improved alkaline oxidative delignification of cellulose pulp - Google Patents

Process for improved alkaline oxidative delignification of cellulose pulp Download PDF

Info

Publication number
EP0377981A3
EP0377981A3 EP19890313196 EP89313196A EP0377981A3 EP 0377981 A3 EP0377981 A3 EP 0377981A3 EP 19890313196 EP19890313196 EP 19890313196 EP 89313196 A EP89313196 A EP 89313196A EP 0377981 A3 EP0377981 A3 EP 0377981A3
Authority
EP
European Patent Office
Prior art keywords
cellulose pulp
alkaline oxidative
improved alkaline
oxidative delignification
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Withdrawn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
EP19890313196
Other languages
German (de)
French (fr)
Other versions
EP0377981A2 (en
Inventor
Madhusudan Dattatraya Jayawant
Rupert D'souza
Jeffrey Shaocheng Hsieh
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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
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 EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of EP0377981A2 publication Critical patent/EP0377981A2/en
Publication of EP0377981A3 publication Critical patent/EP0377981A3/en
Withdrawn legal-status Critical Current

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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
    • D21C1/00—Pretreatment of the finely-divided materials before digesting
    • D21C1/04—Pretreatment of the finely-divided materials before digesting with acid reacting compounds

Abstract

Treatment of the pulp with sufficient nitrosating agent to provide 0.1 to 1.2 weight percent active NO(+) on a dry pulp basis at a pH of 1.7 to 4 and in oxygen environment under high intensity mixing conditions before an alkaline oxidative stage in a bleach sequence, the nitrosating agent being a compound that contributes predominantly nitrosonium ions.
EP19890313196 1988-12-20 1989-12-18 Process for improved alkaline oxidative delignification of cellulose pulp Withdrawn EP0377981A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US28678288A 1988-12-20 1988-12-20
US286782 1988-12-20

Publications (2)

Publication Number Publication Date
EP0377981A2 EP0377981A2 (en) 1990-07-18
EP0377981A3 true EP0377981A3 (en) 1992-06-24

Family

ID=23100136

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890313196 Withdrawn EP0377981A3 (en) 1988-12-20 1989-12-18 Process for improved alkaline oxidative delignification of cellulose pulp

Country Status (9)

Country Link
EP (1) EP0377981A3 (en)
JP (1) JPH02216290A (en)
AU (1) AU4699989A (en)
BR (1) BR8906570A (en)
CA (1) CA2005369A1 (en)
DK (1) DK648589A (en)
FI (1) FI896085A0 (en)
NO (1) NO895108L (en)
ZA (1) ZA899775B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1006056A3 (en) * 1992-07-06 1994-05-03 Solvay Interox Method of laundering of chemical pulp.
WO2021209586A1 (en) * 2020-04-16 2021-10-21 Bim Kemi Ab Delignification process

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2537176A1 (en) * 1982-12-01 1984-06-08 Mo Och Domsjoe Ab PROCESS FOR BLEACHING BY DELIGNIFICATION OF THE CELLULOSIC PASTE

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2537176A1 (en) * 1982-12-01 1984-06-08 Mo Och Domsjoe Ab PROCESS FOR BLEACHING BY DELIGNIFICATION OF THE CELLULOSIC PASTE

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
1989 TAPPI PULPING CONFERENCE (SEATTLE) Proceedings (Book 1), pages 203-211;22-25 Oct 89 D'Souza, R.; Hsieh, J.S.; Jayawant, M.D.: "Liquid-phase nitrosation pretreatement for oxygen delignification of kraft pulps." *
ABSTRACT BULLETIN OF THE INSTITUTE OF PAPER CHEMISTRY. vol. 50, no. 1, July 1979, APPLETON US page 53; BRINK, D.L. ET AL.: 'Soda pulping using a nitric oxyde-oxygen pretreatment.' *
ABSTRACT BULLETIN OF THE INSTITUTE OF PAPER CHEMISTRY. vol. 59, no. 1, July 1988, APPLETON US KUBELKA, V. ET AL.: 'Modification of sulfite pulps with nitrogen dioxide' *

Also Published As

Publication number Publication date
EP0377981A2 (en) 1990-07-18
DK648589A (en) 1990-06-21
AU4699989A (en) 1990-06-28
BR8906570A (en) 1990-09-04
NO895108D0 (en) 1989-12-19
NO895108L (en) 1990-06-21
JPH02216290A (en) 1990-08-29
CA2005369A1 (en) 1990-06-20
FI896085A0 (en) 1989-12-19
ZA899775B (en) 1991-08-28
DK648589D0 (en) 1989-12-19

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