SE7904430L - MASS BLEACHING - Google Patents

MASS BLEACHING

Info

Publication number
SE7904430L
SE7904430L SE7904430A SE7904430A SE7904430L SE 7904430 L SE7904430 L SE 7904430L SE 7904430 A SE7904430 A SE 7904430A SE 7904430 A SE7904430 A SE 7904430A SE 7904430 L SE7904430 L SE 7904430L
Authority
SE
Sweden
Prior art keywords
kraft pulp
concentration
salt
complexing agent
pulp
Prior art date
Application number
SE7904430A
Other languages
Unknown language ( )
Swedish (sv)
Inventor
B H May
Original Assignee
Monsanto Europe Sa
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 Monsanto Europe Sa filed Critical Monsanto Europe Sa
Publication of SE7904430L publication Critical patent/SE7904430L/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
    • D21C9/1026—Other features in bleaching processes
    • D21C9/1042—Use of chelating agents

Abstract

This invention provides a process for bleaching kraft pulp. The kraft pulp is subjected to the action of oxygen, the kraft pulp having fibres dispersed in an aqueous alkaline medium containing a complexing agent. The complexing agent employed is an alkali metal salt of at least one aminomethylenephosphonic acid of the formula <IMG> where n is 2 to 6 and m has a value of from 0 to 5, the salt being present in a concentration of at least 0.01% based on the dry weight of the pulp, provided that where the concentration is 0.1% or less, the aqueous medium also contains a magnesium salt.
SE7904430A 1978-05-26 1979-05-21 MASS BLEACHING SE7904430L (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2290178 1978-05-26

Publications (1)

Publication Number Publication Date
SE7904430L true SE7904430L (en) 1979-11-27

Family

ID=10186899

Family Applications (1)

Application Number Title Priority Date Filing Date
SE7904430A SE7904430L (en) 1978-05-26 1979-05-21 MASS BLEACHING

Country Status (7)

Country Link
AU (1) AU528265B2 (en)
CA (1) CA1120210A (en)
FI (1) FI71177C (en)
FR (1) FR2426767A1 (en)
NO (1) NO153309C (en)
SE (1) SE7904430L (en)
ZA (1) ZA792563B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE434284B (en) * 1980-05-07 1984-07-16 Mo Och Domsjoe Ab PROCEDURES FOR OXYGEN DELIGNIFICATION OF CHEMICAL CONSUMPED CELLULOSAMASSA TO WHICH AROMATIC DIAMINES ARE PROVIDED
SE441192B (en) * 1980-05-27 1985-09-16 Mo Och Domsjoe Ab PROCEDURE FOR DELIGNIFICATION OF CHEMICAL CELLULOSAMASSA WITH OXYGEN IN THE PRESENCE OF ONE OR MULTIPLE NEUTRALIZING AGENTS
CN102229619A (en) * 2011-04-26 2011-11-02 河南清水源科技股份有限公司 Tetraethylenepentamine heptamethylene phosphonic acid and preparation technology thereof
BR112020004842A2 (en) 2017-09-11 2020-09-15 Solenis Technologies, L.P. improved oxygen delignification method for chemical wood pulps

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE785964A (en) * 1971-07-07 1973-01-08 Monsanto Co CONDENSED DERIVATIVES OF POLYALKYLENEPOLYAMINES

Also Published As

Publication number Publication date
NO153309B (en) 1985-11-11
NO791728L (en) 1979-11-27
NO153309C (en) 1986-02-19
FR2426767A1 (en) 1979-12-21
FI791681A (en) 1979-11-27
AU528265B2 (en) 1983-04-21
CA1120210A (en) 1982-03-23
FI71177B (en) 1986-08-14
ZA792563B (en) 1980-10-29
FI71177C (en) 1986-11-24
AU4723379A (en) 1979-11-29
FR2426767B1 (en) 1985-03-22

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