EP0148712B1 - Procédé de blanchiment de pâtes papetières par le peroxyde d'hydrogène - Google Patents

Procédé de blanchiment de pâtes papetières par le peroxyde d'hydrogène Download PDF

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Publication number
EP0148712B1
EP0148712B1 EP84420215A EP84420215A EP0148712B1 EP 0148712 B1 EP0148712 B1 EP 0148712B1 EP 84420215 A EP84420215 A EP 84420215A EP 84420215 A EP84420215 A EP 84420215A EP 0148712 B1 EP0148712 B1 EP 0148712B1
Authority
EP
European Patent Office
Prior art keywords
hydrogen peroxide
weight
alkaline
concentration
bleaching
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
EP84420215A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0148712A1 (fr
Inventor
Bernard Dubreux
Jean-Pierre Schirrmann
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.)
Arkema France SA
Original Assignee
Atochem SA
Elf Atochem 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 Atochem SA, Elf Atochem SA filed Critical Atochem SA
Priority to AT84420215T priority Critical patent/ATE29537T1/de
Publication of EP0148712A1 publication Critical patent/EP0148712A1/fr
Application granted granted Critical
Publication of EP0148712B1 publication Critical patent/EP0148712B1/fr
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

  • the present invention relates to a process for bleaching chemical pulp with hydrogen peroxide.
  • the bleaching of chemical paper pulp that is to say unbleached cellulose pulp obtained by cooking lignocellulosic materials according to the so-called sulphite, sulphate or Kraft, soda or carbonate processes, is generally practiced in industry using chlorine or chlorine derivatives having, like chlorine, an oxidizing character, such as chlorine dioxide CI0 2 or sodium hypochlorite NaOCI.
  • None of the oxidizing agents is, however, capable of ensuring satisfactory whitening alone in a single operation, by referring to the variation in the measured value of the Kappa index resulting from their action. It is known to those skilled in the art that, in the case of chemical pulps and unlike in the case of mechanical type pulps, the extent of this variation is directly related to bleaching, as described for example in Volume I of the 3rd edition of Pulp and Paper, 663-665, James P. Casey Editor, John Wiley & Sons, New York. It is necessary to operate in several distinct stages and in intermediate operations such as in particular so-called alkaline bath extraction operations. The effluents resulting from such operating sequences are very strongly colored, polluting and corrosive. They can even cause risks of explosion during the reagent regeneration cycle. They contain in particular large quantities of chlorinated organic products and chloride ions. As a result, they cannot be rejected or recycled without complex and costly treatments.
  • Hydrogen peroxide can be used at atmospheric pressure in conventional bleaching equipment. Its direct use on unbleached pasta with a kappa index of around 30, however, did not make it possible to obtain processed pasta with a kappa index of less than approximately 20-25.
  • An additional step of pretreatment of the pastes in an acid medium makes it possible, as described in Japanese patent application No. 76/102103 and French patent application No. 23 98 839, to improve this result but, like all the known bleaching processes based on alternating steps in acid bath and in alkaline bath, do not make it possible to avoid the problems raised by the rejection or recycling of liquors after use, nor to reach low kappa degrees for processed pasta.
  • bleaching with H 2 0 2 is advantageously carried out by admitting as alkaline earth in the bath magnesium in small quantity, at most about 0.02% in practice, introduced in the form of salt soluble, excluding calcium, the action of which counteracts that of magnesium.
  • the method according to the invention makes it possible, in a single step from unbleached chemical pulps, to obtain bleached pulps with a kappa index of less than 10 while delivering effluents directly recyclable in the bleaching operation.
  • It consists of treating unbleached cellulose pulp with hydrogen peroxide, in a single step, at a temperature between 70 ° C and 100 ° C, using a bleaching bath of pH maintained between 11 and 11.5 and comprising, in addition to hydrogen peroxide, at least one alkaline agent chosen from sodium hydroxide and sodium carbonate, at least one alkali metal silicate at a concentration expressed as silica Si0 2 at least equal at 0.3% by weight, at least one magnesium salt and at least one calcium salt, in an amount such that the concentration by weight of each of the alkaline earth elements is between 0.05% and 1%, kept dissolved using at least one complexing agent for alkaline earth ions, the overall concentration in complexing not exceeding 10% by weight.
  • a bleaching bath of pH maintained between 11 and 11.5 comprising, in addition to hydrogen peroxide, at least one alkaline agent chosen from sodium hydroxide and sodium carbonate, at least one alkali metal silicate at a concentration expressed as silica Si0 2 at least equal at 0.3% by
  • the concentration of hydrogen peroxide in the bleaching bath is that commonly adopted in this industrial field. It generally does not exceed 1% by weight and is most often between 0.02 and 0.05%.
  • the concentration by weight of alkali metal silicate, expressed as Si0 2 is chosen, for reasons of economy, less than 20% and is most often less than 5%.
  • the most suitable calcium salts and magnesium salts are those whose anion exhibits the best inertia with respect to hydrogen peroxide under the conditions for carrying out the process of the invention, such as, for example, chlorides .
  • the complexing agent (s) of the magnesium and calcium ions are for example chosen from polyphosphates and pyrophosphates of alkali metal, nitrogenous acids, such as ethylenededia mine-tetracetic acid, diethylenetriamine pentacetic acid and acid nitrilotriacetic, or their salts, monomeric or polymeric phosphoric acids, polyelectrolytes such as poly-hydroxyacrylic acid and the corresponding lactone.
  • the bleaching obtained remains excellent but requires to be achieved quickly prohibitive residence times.
  • the process of the invention is carried out at a temperature above 100 ° C. the decom position of hydrogen peroxide quickly becomes annoying.
  • the preferred temperature range is 85 ° C to 95 ° C.
  • the mode of constitution of the bleaching bath can be arbitrary, it is preferred to carry out the solubilization in aqueous medium of the calcium and magnesium salts in the presence of the agent or agents complexing the alkaline earth ions, to then introduce into the solution thus obtained the alkali metal silicate in the form of a concentrated aqueous solution, then the hydrogen peroxide solution before bringing the pH of the mixture to a value between 11 and 11.5 using hydroxide or sodium carbonate.
  • the contact of the dough to be bleached with the bath formed for this purpose is carried out either discontinuously or continuously, by passage of the bleaching solution through a solid phase consisting of cellulosic material, or by intimate mixing of this solution with this solid phase.
  • the weight ratio of bleaching solution / solid material can be between 10 and 100 and preferably between 15 and 50.
  • this ratio can be between 4 and 100 and preferably between 8 and 20.
  • the pulp after treatment has a kappa index which is no more than 8, the quantity of hydrogen peroxide consumed to achieve this result representing only 4% by weight of the pulp engaged.
  • Example 2 By operating as in Example 1 and retaining as a bleaching solution the solution which served to treat the charge of unbleached pulp of Example 1, a second charge of unbleached pulp is treated then a third. At the end of this third operation, it is found that the bleaching bath has retained all its effectiveness since the treated dough has a kappa index of 8 while the consumption of hydrogen peroxide is 4.1% by weight relative to by the weight of committed dough.
  • Example 1 10 g of unbleached dough of the same origin and of the same kappa index as in Example 1 are mixed with 100 g of solution of the same weight composition as in Example 1. The mixture is maintained at 90 ° C. for 10 hours with introduction , after 5 hours, 0.34 g of hydrogen peroxide.
  • the pulp, after treatment, has a kappa index equal to 8, the consumption of hydrogen peroxide to achieve this result being only 4.3% by weight relative to the pulp engaged.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Detergent Compositions (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
  • Load-Bearing And Curtain Walls (AREA)
EP84420215A 1983-12-29 1984-12-21 Procédé de blanchiment de pâtes papetières par le peroxyde d'hydrogène Expired EP0148712B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84420215T ATE29537T1 (de) 1983-12-29 1984-12-21 Verfahren zum bleichen von papierpulpen mittels wasserstoffperoxid.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8320990 1983-12-29
FR8320990A FR2557605B1 (fr) 1983-12-29 1983-12-29 Procede de blanchiment de pates papetieres par le peroxyde d'hydrogene

Publications (2)

Publication Number Publication Date
EP0148712A1 EP0148712A1 (fr) 1985-07-17
EP0148712B1 true EP0148712B1 (fr) 1987-09-09

Family

ID=9295687

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84420215A Expired EP0148712B1 (fr) 1983-12-29 1984-12-21 Procédé de blanchiment de pâtes papetières par le peroxyde d'hydrogène

Country Status (9)

Country Link
EP (1) EP0148712B1 (enrdf_load_stackoverflow)
JP (1) JPS60181391A (enrdf_load_stackoverflow)
AT (1) ATE29537T1 (enrdf_load_stackoverflow)
AU (1) AU567787B2 (enrdf_load_stackoverflow)
CA (1) CA1262805A (enrdf_load_stackoverflow)
DE (2) DE3466024D1 (enrdf_load_stackoverflow)
ES (1) ES8602173A1 (enrdf_load_stackoverflow)
FI (1) FI76135C (enrdf_load_stackoverflow)
FR (1) FR2557605B1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8845860B2 (en) 2010-09-16 2014-09-30 Georgia-Pacific Consumer Products Lp High brightness pulps from lignin rich waste papers

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3544398A1 (de) * 1985-12-16 1987-06-19 Sueddeutsche Kalkstickstoff Verfahren zur bleiche und delignifizierung von zellstoffhaltigen produkten
JPH0642046B2 (ja) * 1987-01-29 1994-06-01 新王子製紙株式会社 写真印画紙用支持体
SE470065C (sv) * 1991-04-30 1996-01-15 Eka Nobel Ab Behandling av kemisk massa med en syra och därefter en magnesium- och kalciumförening vid klorfri blekning
ATE184060T1 (de) * 1993-04-20 1999-09-15 Eka Chemicals Ab Verfahren zum bleichen von lignozellulose- enthaltendem zellstoff
IT1290070B1 (it) * 1997-03-13 1998-10-19 3V Sigma Spa Composizioni per la sbianca della carta
GB2327894A (en) * 1997-08-01 1999-02-10 Nippon Paint Co Ltd Method of multi-layer coating formation
US6699358B1 (en) 1998-05-15 2004-03-02 National Silicates Partnership Method for brightening chemical pulp with hydrogen peroxide using a magnesium compound in silicate solution
CA2332304C (en) * 1998-05-15 2005-01-11 National Silicates Partnership Peroxide, oxygen, and peroxide/oxygen brightening of chemical and mixed waste pulps
US7001484B2 (en) 2000-05-04 2006-02-21 University Of New Brunswick Peroxide bleaching of wood pulp using stabilizers and sodium hydrosulfide reducing agent

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US437813A (en) * 1890-10-07 Envelope-machine
NL97796C (enrdf_load_stackoverflow) * 1958-05-29
US3472813A (en) * 1967-01-18 1969-10-14 Argus Chem Resistance of acrylonitrile butadiene styrene polymers to discoloration
FR2038056A1 (en) * 1969-03-07 1971-01-08 Air Liquide Stable, clear bleaching bath for paper - pulp
SE7510015L (sv) * 1975-09-09 1977-03-10 Dev Ab Sca Sett att behandla lignocellulosahaltigt material
JPS583074B2 (ja) * 1975-11-17 1983-01-19 三菱瓦斯化学株式会社 パルプノ カサンカブツヒヨウハクホウ
JPS5927436B2 (ja) * 1979-05-29 1984-07-05 王子製紙株式会社 木材パルプの過酸化物漂白方法
FR2476684A1 (fr) * 1980-02-21 1981-08-28 Interox Procede pour inhiber la corrosion d'appareils en titane

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8845860B2 (en) 2010-09-16 2014-09-30 Georgia-Pacific Consumer Products Lp High brightness pulps from lignin rich waste papers

Also Published As

Publication number Publication date
FI845121A0 (fi) 1984-12-27
DE148712T1 (de) 1986-01-02
FI76135C (fi) 1992-04-15
DE3466024D1 (en) 1987-10-15
ES539151A0 (es) 1985-11-16
JPS6261716B2 (enrdf_load_stackoverflow) 1987-12-23
FI76135B (fi) 1988-05-31
EP0148712A1 (fr) 1985-07-17
AU567787B2 (en) 1987-12-03
ATE29537T1 (de) 1987-09-15
FR2557605B1 (fr) 1987-12-11
CA1262805A (fr) 1989-11-14
FI845121L (fi) 1985-06-30
ES8602173A1 (es) 1985-11-16
AU3724384A (en) 1985-07-04
FR2557605A1 (fr) 1985-07-05
JPS60181391A (ja) 1985-09-17

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