EP0348411B1 - An improved peroxide bleaching method - Google Patents

An improved peroxide bleaching method Download PDF

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Publication number
EP0348411B1
EP0348411B1 EP88901957A EP88901957A EP0348411B1 EP 0348411 B1 EP0348411 B1 EP 0348411B1 EP 88901957 A EP88901957 A EP 88901957A EP 88901957 A EP88901957 A EP 88901957A EP 0348411 B1 EP0348411 B1 EP 0348411B1
Authority
EP
European Patent Office
Prior art keywords
acid
pulp
bleaching
suspension
hydrogen peroxide
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.)
Expired
Application number
EP88901957A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0348411A1 (en
Inventor
Joseph Kubat
Lars Magnus Qvist
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.)
Kemira Kemi AB
Original Assignee
Kemira Kemi 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 Kemira Kemi AB filed Critical Kemira Kemi AB
Priority to AT88901957T priority Critical patent/ATE83016T1/de
Publication of EP0348411A1 publication Critical patent/EP0348411A1/en
Application granted granted Critical
Publication of EP0348411B1 publication Critical patent/EP0348411B1/en
Expired 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
    • 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
    • D21C9/16—Bleaching ; Apparatus therefor with per compounds
    • D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides

Definitions

  • Combinations of hydrogen peroxide with certain organic acids stand out as an especially efficient form of the peroxide bleaching technique.
  • the treatment is carried out within the acid range of the pH-scale, facilitating the formation of peroxyacids which are the active chemical species in the bleaching process.
  • the common way, of bleaching with peroxides is carried out using slightly alkaline conditions enhancing the formation of peroxide anions HO2 ⁇ which are the active ionic species. Higher alkalinities are to be avoided since hydrogen peroxide then decomposes to oxygen.
  • the purpose of the present disclosure is to describe a simple method to enhance the bleaching efficiency of hydrogen peroxide by adding certain inexpensive organic acids to the bleaching solution.
  • the acids in question are formic, acetic, lactic, maleic acid and phtalic acid; they can be used separately or in various combinations. Contrary to similar mixtures of hydrogen peroxide with such acids which have been proposed to increase the efficiency of the bleaching process, cf. for instance Austrian Patent 203.454, the mixtures of the present disclosure are being used within the alkaline range of the pH-scale and not on its acid side.
  • This alkalinity of the treating solution is the main characteristic feature of the present invention relating to peroxide bleaching process in the presence of the organic acids enumerated above, i.e. formic, acetic, lactic, maleic acid and phtalic acid or mixtures thereof.
  • the bleaching efficiency of peroxides can be improved if the bleaching process is carried out in the presence of low concentrations of one or more of the enumerated acids while maintaining the pH-value within the alkaline range 8-13, which pH-range is provided by the addition of an alkali metal hydroxide, such as sodium hydroxide or potassium hydroxide.
  • an alkali metal hydroxide such as sodium hydroxide or potassium hydroxide.
  • US-A-3,193,445 discloses a two-step process for bleaching cellulosic materials, e.g. wood pulp, whereby in a first step bleaching takes place using hydrogen peroxide at an alkaline pH and in a second step a carboxylic acid anhydride is added to reduce the content of hydrogen peroxide remaining in the reaction medium.
  • the method according to the present invention allows bleaching with lower acid and peroxide concentrations than when using common peroxy acid methods while still obtaining the same bleaching effect.
  • potassium hydroxide gives a significantly higher brightness of the bleached material than does sodium hydroxide. The difference amounted to 2-8 SCAN brightness units.
  • a bleaching mixture containing 4% H2O2, 1% acetic acid, and 1% formic acid gave after bleaching carried out as described above a brightness of 78%, the brightness gain being 18 units.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Detergent Compositions (AREA)
EP88901957A 1987-02-12 1988-02-12 An improved peroxide bleaching method Expired EP0348411B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88901957T ATE83016T1 (de) 1987-02-12 1988-02-12 Peroxid-bleichverfahren.

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE8700569 1987-02-12
SE8700569A SE8700569D0 (sv) 1987-02-12 1987-02-12 An improved peroxide bleaching method
CA000612006A CA1333650C (en) 1987-02-12 1989-09-19 Peroxide bleaching method

Publications (2)

Publication Number Publication Date
EP0348411A1 EP0348411A1 (en) 1990-01-03
EP0348411B1 true EP0348411B1 (en) 1992-12-02

Family

ID=25673050

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88901957A Expired EP0348411B1 (en) 1987-02-12 1988-02-12 An improved peroxide bleaching method

Country Status (7)

Country Link
EP (1) EP0348411B1 (sv)
AT (1) ATE83016T1 (sv)
CA (1) CA1333650C (sv)
DE (1) DE3876429T2 (sv)
FI (1) FI91545C (sv)
SE (1) SE8700569D0 (sv)
WO (1) WO1988006202A1 (sv)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE505980C2 (sv) * 1993-12-23 1997-10-27 Bim Kemi Ab Sätt att förhindra peroxidnedbrytande enzymer vid blekning med väteperoxid
DE19516151A1 (de) * 1995-05-03 1996-11-07 Sven Siegle Verfahren zur Herstellung einer Pulpe aus zellulosehaltigem Material, die Pulpe selbst und deren Verwendung
FI115470B (sv) * 1996-02-19 2005-05-13 Kemira Oyj Förfarande för behandling av kemiskt cellulosamaterial
FI115641B (sv) * 1996-02-19 2005-06-15 Kemira Oyj Blekningsprocess för högutbytesmassor

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO109292C (sv) * 1962-07-16
DE2219505C3 (de) * 1972-04-21 1974-10-17 Deutsche Gold- Und Silber-Scheideanstalt Vormals Roessler, 6000 Frankfurt Chlorfreie Mehrstufenbleiche von Zellstoff

Also Published As

Publication number Publication date
ATE83016T1 (de) 1992-12-15
SE8700569D0 (sv) 1987-02-12
EP0348411A1 (en) 1990-01-03
FI91545B (sv) 1994-03-31
DE3876429T2 (de) 1993-07-01
WO1988006202A1 (en) 1988-08-25
CA1333650C (en) 1994-12-27
DE3876429D1 (de) 1993-01-14
FI91545C (sv) 1994-07-11
FI893742A0 (sv) 1989-08-08

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