EP0348411B1 - Methode amelioree de decoloration au peroxyde - Google Patents

Methode amelioree de decoloration au peroxyde Download PDF

Info

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)
Other versions
EP0348411A1 (fr
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/fr
Application granted granted Critical
Publication of EP0348411B1 publication Critical patent/EP0348411B1/fr
Expired 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
    • D21C9/16—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)

Claims (4)

  1. Procédé de blanchiment d'une pâte de bois sans l'utilisation de peroxyacides grâce à une quantité de 0,1 à 10 % de peroxyde d'hydrogène, par rapport au poids sec de la pâte, caractérisé en ce qu'on ajoute un acide organique, choisi dans le groupe comprenant les acides formique, acétique, lactique, maléique et phtalique ou l'un quelconque de leurs mélanges à la suspension de pâte à blanchir, en même temps qu'une quantité d'un hydroxyde alcalin propre à donner une valeur de pH à la suspension, se situant dans l'intervalle alcalin de 8,0 à 13.
  2. Procédé suivant la revendication 1, caractérisé en ce qu'on utilise l'acide en une quantité de 0,25 à 10 % par rapport au poids sec de la pâte.
  3. Procédé suivant la revendication 1 ou 2, caractérisé en ce que l'hydroxyde de métal alcalin utilisé est l'hydroxyde de potassium.
  4. Procédé suivant l'une quelconque des revendications précédentes, caractérisé en ce que l'intervalle de pH alcalin que l'on utilise est de 9-10.
EP88901957A 1987-02-12 1988-02-12 Methode amelioree de decoloration au peroxyde Expired EP0348411B1 (fr)

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
SE8700569A SE8700569D0 (sv) 1987-02-12 1987-02-12 An improved peroxide bleaching method
SE8700569 1987-02-12
CA000612006A CA1333650C (fr) 1987-02-12 1989-09-19 Methode de blanchiment au peroxyde

Publications (2)

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

Family

ID=25673050

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88901957A Expired EP0348411B1 (fr) 1987-02-12 1988-02-12 Methode amelioree de decoloration au peroxyde

Country Status (7)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2026017672A1 (fr) * 2024-07-18 2026-01-22 Lenzing Aktiengesellschaft Procédé de stabilisation d'une étape de blanchiment d'une matière polysaccharidique à l'aide d'un liquide résiduaire alcalin

Families Citing this family (5)

* 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
BR9508387A (pt) * 1994-07-11 1997-11-25 Beloit Technologies Inc Vasos de alta eficiéncia pra alvejamento de materiais fibrosos lignocelulósicos celulósicos e poliméricos sintéticos
DE19516151A1 (de) * 1995-05-03 1996-11-07 Sven Siegle Verfahren zur Herstellung einer Pulpe aus zellulosehaltigem Material, die Pulpe selbst und deren Verwendung
FI115641B (fi) * 1996-02-19 2005-06-15 Kemira Oyj Korkeasaantomassojen valkaisumenetelmä
FI115470B (fi) * 1996-02-19 2005-05-13 Kemira Oyj Menetelmä kemiallisen selluloosamateriaalin käsittelemiseksi

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL293489A (fr) * 1962-07-16
DE2219505C3 (de) * 1972-04-21 1974-10-17 Deutsche Gold- Und Silber-Scheideanstalt Vormals Roessler, 6000 Frankfurt Chlorfreie Mehrstufenbleiche von Zellstoff

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2026017672A1 (fr) * 2024-07-18 2026-01-22 Lenzing Aktiengesellschaft Procédé de stabilisation d'une étape de blanchiment d'une matière polysaccharidique à l'aide d'un liquide résiduaire alcalin

Also Published As

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

Similar Documents

Publication Publication Date Title
Gould Studies on the mechanism of alkaline peroxide delignification of agricultural residues
US5552018A (en) A process for delignifying pulp with organic peroxyacid in the presence of phosphonic acids and their salts
JP2504400B2 (ja) 過酸化水素による機械パルプの漂白法
CA2155124C (fr) Inhibition d'enzymes de decomposition du peroxyde d'hydrogene tels que la catalase et la peroxydase au cours du blanchiment de fibres de cellulose
EP0348411B1 (fr) Methode amelioree de decoloration au peroxyde
US5618386A (en) Enzymatic bleaching of chemical lignocellulose pulp
US5607544A (en) Process and agent for the oxidative bleaching of wood pulp and for deinking waste paper
RU2189412C2 (ru) Способ отбеливания бумажной массы
US5616280A (en) Bleaching composition
CA1122358A (fr) Methode de blanchiment absolu de la pate a papier
HUT64119A (en) Method for enzyme-bleaching cellulose
US5698075A (en) Process for bleaching a chemical paper pulp in an oxygen-peroxymonosulfuric acid-hydrogen peroxide sequence
JPS63256786A (ja) パルプ漂白方法
CA2149649C (fr) Procede de blanchiment de pate contenant de la lignocellulose
US3709779A (en) Bleaching of mechanical pulps with hydrosulfite in the presence of an alkali metal silikate
US2687943A (en) Bleaching of mechanical wood pulp
RU2200155C2 (ru) Способ получения раствора пероксокислот для делигнификации и отбеливания
US3966698A (en) Recovery of tall oil soaps
JP2779197B2 (ja) 植物繊維の漂白方法
JP3265036B2 (ja) アルカリパルプの漂白方法
SU861444A1 (ru) Варочный раствор дл получени волокнистого полуфабриката
US3733247A (en) Bleching of cellulose fibers with an aqueous solution of a water-soluble hydroperoxypentacyanocobaltate salt
JPS6297991A (ja) セルロ−ス性物質の脱リグニン法
JPH10500178A (ja) ケミカルペーパーパルプの漂白方法
JPH0748792A (ja) ペーパーパルプの漂白方法

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19891016

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT CH DE FR GB IT LI SE

R17P Request for examination filed (corrected)

Effective date: 19890731

DIN1 Information on inventor provided before grant (deleted)
RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: KEMIRA KEMI AKTIEBOLAG

17Q First examination report despatched

Effective date: 19910618

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT CH DE FR GB IT LI SE

REF Corresponds to:

Ref document number: 83016

Country of ref document: AT

Date of ref document: 19921215

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3876429

Country of ref document: DE

Date of ref document: 19930114

ET Fr: translation filed
ITF It: translation for a ep patent filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19930222

Year of fee payment: 6

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19940213

EUG Se: european patent has lapsed

Ref document number: 88901957.6

Effective date: 19940910

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19950810

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19950811

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19950828

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19950831

Year of fee payment: 8

Ref country code: CH

Payment date: 19950831

Year of fee payment: 8

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19960212

Ref country code: AT

Effective date: 19960212

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19960229

Ref country code: CH

Effective date: 19960229

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19960212

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19961031

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19961101

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050212