EP0208625B1 - Traitement de pâtes papetières chimiques par le peroxyde d'hydrogène en vue de leur blanchiment - Google Patents

Traitement de pâtes papetières chimiques par le peroxyde d'hydrogène en vue de leur blanchiment Download PDF

Info

Publication number
EP0208625B1
EP0208625B1 EP86420138A EP86420138A EP0208625B1 EP 0208625 B1 EP0208625 B1 EP 0208625B1 EP 86420138 A EP86420138 A EP 86420138A EP 86420138 A EP86420138 A EP 86420138A EP 0208625 B1 EP0208625 B1 EP 0208625B1
Authority
EP
European Patent Office
Prior art keywords
hydrogen peroxide
weight
stage
treatment according
dry 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.)
Expired
Application number
EP86420138A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0208625A1 (fr
Inventor
Bernard Dubreux
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 AT86420138T priority Critical patent/ATE32534T1/de
Publication of EP0208625A1 publication Critical patent/EP0208625A1/fr
Application granted granted Critical
Publication of EP0208625B1 publication Critical patent/EP0208625B1/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

  • the present invention relates to the treatment of chemical paper pulps with hydrogen peroxide with a view to their bleaching.
  • the lignin level of the pulp translated by the profession into a KAPPA index, practically determines the overall quantity of chemical bleach to be used.
  • Pretreatment mid acid as described for example in Japanese Patent Application No. 76.102103 and the French patent application published under the e No. 2,520,397 reduces this value to 15-20 but raises difficulties previously reported due to effluents as a result of the alternation of steps in acid bath and in alkaline bath implied by the proposed technique.
  • the treatment according to the present invention does not imply the drawbacks of the known methods and provides pasta whose KAPPA index can range. up to being less than 10 from chemical pulp of softwoods with a very high efficiency of the chemical agent used, hydrogen peroxide.
  • the chemical pulp of softwood is subjected to the action of hydrogen peroxide at a temperature between 90 ° C and 100 ° C, in two stages, the first carried out at a pH between 8, 5 and 9.5, in the presence of at least one metal ion sequestering agent chosen from nitrogen sequestering agents and sequestering agents derived from polyphosphoric and poylphosphonic acids, in an amount equal to at least 3 g / l of bath, so as to consume an amount by weight of hydrogen peroxide of between 0.3% and 2.5% by weight of the dry paste, the second carried out at a pH at least equal to 11, in the presence of at least 3 ⁇ 10 -3 gram atom of magnesium in the form of magnesium hydroxide Mg (OH) z per hundred grams of dry paste to consume hydrogen peroxide during this second stage so that the total weight consumption of hydrogen peroxide during the two stages is between 2% and 5% of the weight of the dry dough.
  • the first carried out at a pH between 8, 5 and 9.5 in the presence of at least
  • the nature of the chemical agent capable of reaching the pH values defined for the first step is not critical, the alkalizing chemical agent chosen, however, being neither oxidized nor reduced by hydrogen peroxide.
  • Sodium hydroxide and sodium carbonate meet the above definition, as also, and preferably, sodium tripolyphosphate, sodium salt of ethylenediaminetetraacetic acid and sodium salt of diethylenetriaminepentaacetic acid .
  • the pH keeps during this first stage a value as constant as possible, which is achievable by known techniques, for example the use of buffers or the continuous or intermittent introduction of one or more chemical agents as defined above.
  • sodium tripolyphosphate the sodium salt of ethylenediaminetetraacetic acid and the sodium salt of diethylenetriaminepentaacetic acid are preferably used.
  • the duration of the first stage is generally less than 4 hours.
  • alkaline agents which may be suitable for reaching the pH chosen in the second step, sodium hydroxide and sodium carbonate are particularly suitable.
  • magnesium hydroxide can be introduced as it is or formed in the treatment bath from a magnesium salt such as chloride, nitrate or sulfate, the anion of which is inert vis- with respect to hydrogen peroxide.
  • a magnesium salt such as chloride, nitrate or sulfate, the anion of which is inert vis- with respect to hydrogen peroxide.
  • the duration of the second stage is generally between 2 and 5 hours.
  • Consistency is not a critical factor for carrying out the two stages of treatment according to the invention. For practical and economic reasons it is always preferable that the consistency is between 3% and 5% and better between 5% and 15%.
  • the quantity of hydrogen peroxide used is of course at least equal to the quantity to be consumed and is at most generally equal to 5% by weight of the weight of dry pulp, preferably 3 , About 5%.
  • the dough can be separated in a customary manner of the liquor from the bath and subjected in a known manner to an alkaline extraction before the second stage of the treatment.
  • This alkaline extraction generally carried out at a temperature of the order of 90 ° to 120 ° C, is preferably carried out in the majority of cases. However, it remains optional and may even advantageously not be carried out in particular when the conditions chosen to perform the first step are such that the hydrogen peroxide used in it is consumed almost entirely.
  • the liquors of the baths of the two stages are separated from the dough, they can respectively be advantageously used to contribute to the constitution of each of these baths in their initial composition.
  • the pulp treated according to the invention can be bleached according to usual methods, the economy and efficiency of which are improved.
  • the conditions defined for carrying out the first step are those which make it possible to obtain, after the second step, chemical pulps with a KAPPA index most generally less than 15 when the chemical pulp to be treated is chemical pulp of softwoods, and a particularly advantageous overall saving in treatment which is reflected, for example, in the high efficiency of hydrogen peroxide.
  • Ef This is designated in the following by the term Ef defined as being equal to: H 2 O 2 consumed being the overall quantity of hydrogen peroxide consumed in% by weight of the weight of dry pulp, A KAPPA the difference between the value of the KAPPA index of the untreated pulp and the value of the KAPPA index of the pulp treated according to the invention.
  • the conditions are such that, as defined above, the pH in the first step is between 8.5 and 9.5, the pH in the second step as elsewhere in the comparative example is at least equal to 11.
  • a chemical pulp of resinous wood with a KAPPA index equal to 28.5 is treated for 2 h at 90 ° C. at the consistency of 5% in the presence of 3.4% of hydrogen peroxide H 2 O 2 and of 41, 4% sodium tripolyphosphate TPP.
  • the dough After alkaline extraction carried out for 1 hour at 90 ° C in the presence of 20% sodium hydroxide NaOH, the dough, with the consistency of 5%, is subjected to 90 ° C and for 2 hours, to the action of 2 , 7% H 2 O 2 in the presence of 3.2% NaOH and 0.5% magnesium hydroxide Mg (OH) 2 .
  • Example 2 The same paste as in Example 1 is subjected, at 90 ° C and for 2 hours, to the action of 3.4% H 2 O 2 in the presence of 4% NaOH and 0.6% Mg ( OH) 2 , the consistency being 5%.
  • a chemical pulp of resinous wood with a KAPPA index equal to 33 is treated at the consistency of 5%, at 90 ° and for 1 hour in the presence of 0.6% H 2 O 2 and 17.2% TPP.
  • the paste is subjected in a second step to the action of 2.7% of H 2 O 2 in the presence of 4% of NaOH and of 0.25% of Mg (OH) z , at 90 ° C for 5 h.
  • the KAPPA index of the treated pulp is 3 times lower than before treatment and Ef. is around 7.
  • the KAPPA index of the treated pulp is 10.5 with an overall H 2 O 2 consumption of 2.0%. Ef. is then close to 9.0.
  • the consumption of H 2 O 2 in the first stage is 0.3%, it is total in the second stage.
  • Example 4 is repeated, but the pH in the first step is reached by means of ethylenediaminetetraacetic acid and sodium hydroxide and is maintained at 9.5 by addition of NaOH.
  • Example 4 The results of Example 4 are practically found.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
  • Stereophonic System (AREA)
  • Measuring Leads Or Probes (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
EP86420138A 1985-05-29 1986-05-27 Traitement de pâtes papetières chimiques par le peroxyde d'hydrogène en vue de leur blanchiment Expired EP0208625B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86420138T ATE32534T1 (de) 1985-05-29 1986-05-27 Behandlung von chemischen papierpulpen mit wasserstoffperoxid im hinblick auf ihre bleichung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8508291A FR2582692B1 (fr) 1985-05-29 1985-05-29 Traitement de pates papetieres chimiques par le peroxyde d'hydrogene en vue de leur blanchiment
FR8508291 1985-05-29

Publications (2)

Publication Number Publication Date
EP0208625A1 EP0208625A1 (fr) 1987-01-14
EP0208625B1 true EP0208625B1 (fr) 1988-02-17

Family

ID=9319780

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86420138A Expired EP0208625B1 (fr) 1985-05-29 1986-05-27 Traitement de pâtes papetières chimiques par le peroxyde d'hydrogène en vue de leur blanchiment

Country Status (10)

Country Link
US (1) US4734161A (enrdf_load_stackoverflow)
EP (1) EP0208625B1 (enrdf_load_stackoverflow)
JP (1) JPS61275491A (enrdf_load_stackoverflow)
AT (1) ATE32534T1 (enrdf_load_stackoverflow)
AU (1) AU5794486A (enrdf_load_stackoverflow)
CA (1) CA1273756A (enrdf_load_stackoverflow)
DE (1) DE3660024D1 (enrdf_load_stackoverflow)
ES (1) ES8802336A1 (enrdf_load_stackoverflow)
FI (1) FI83239C (enrdf_load_stackoverflow)
FR (1) FR2582692B1 (enrdf_load_stackoverflow)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
FR2622221A1 (fr) * 1987-10-22 1989-04-28 Atochem Procede de blanchiment de pates
EP0402335B2 (en) * 1989-06-06 2001-03-14 Eka Chemicals AB Process for bleaching lignocellulose-containing pulps
SE9001481L (sv) * 1990-04-23 1991-10-24 Eka Nobel Ab Reduktion av halogenorganiska foereningar i blekeriavlopp
FR2661431B1 (fr) * 1990-04-30 1992-07-17 Atochem Procede de blanchiment au peroxyde de l'hydrogene de pates a papier a haut rendement.
BE1007700A3 (fr) * 1993-11-04 1995-10-03 Solvay Interox Procede pour le blanchiment d'une pate a papier chimique.
ZA955190B (en) * 1994-07-11 1996-03-14 Ingersoll Rand Co Method for bleaching wood pulp using hydrogen peroxide
US5562740A (en) * 1995-06-15 1996-10-08 The Procter & Gamble Company Process for preparing reduced odor and improved brightness individualized, polycarboxylic acid crosslinked fibers
RU2155834C1 (ru) * 2000-02-24 2000-09-10 Камский целлюлозно-бумажный комбинат Способ отбелки древесной массы
RU2164571C1 (ru) * 2000-06-27 2001-03-27 Камский целлюлозно-бумажный комбинат Способ получения беленой сульфитной целлюлозы на магниевом основании
CA2373562A1 (en) * 2001-02-27 2002-08-27 Aileen Reyes Gibson Eop & ep process for bleaching of chemical pulp
US7297225B2 (en) * 2004-06-22 2007-11-20 Georgia-Pacific Consumer Products Lp Process for high temperature peroxide bleaching of pulp with cool discharge
FR3007044B1 (fr) * 2013-06-13 2016-01-15 Air Liquide Procede de traitement des pates papetieres chimiques par traitement a l'ozone en presence d'ions magnesium

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2865701A (en) * 1953-12-07 1958-12-23 Nat Distillers Chem Corp Process of bleaching kraft pulp with alkaline hypochlorite bleach acidifying the pulp containing residual chlorine and then bleaching with alkaline peroxide
FR2038056A1 (en) * 1969-03-07 1971-01-08 Air Liquide Stable, clear bleaching bath for paper - pulp
US4187141A (en) * 1975-02-24 1980-02-05 Alf Societe Anonyme Method of producing bleached mechanical pulp
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
JPS5545806A (en) * 1978-09-21 1980-03-31 Oji Paper Co Peroxide bleaching method of wood pulp
US4294575A (en) * 1979-01-02 1981-10-13 Monsanto Company Peroxide stabilization
JPS5891884A (ja) * 1981-11-27 1983-05-31 工業技術院長 高白色度未晒パルプの製造方法
SE451606B (sv) * 1982-09-14 1987-10-19 Sca Development Ab Sett vid blekning av hogutbytesmassor medelst peroxider

Also Published As

Publication number Publication date
CA1273756A (fr) 1990-09-11
FI862257L (fi) 1986-11-30
US4734161A (en) 1988-03-29
FI862257A0 (fi) 1986-05-28
JPS61275491A (ja) 1986-12-05
FR2582692B1 (fr) 1987-12-11
DE3660024D1 (en) 1988-03-24
ES8802336A1 (es) 1987-05-01
AU5794486A (en) 1986-12-04
FI83239B (fi) 1991-02-28
FR2582692A1 (fr) 1986-12-05
ATE32534T1 (de) 1988-03-15
ES555395A0 (es) 1987-05-01
JPH0156194B2 (enrdf_load_stackoverflow) 1989-11-29
EP0208625A1 (fr) 1987-01-14
FI83239C (fi) 1991-06-10

Similar Documents

Publication Publication Date Title
EP0208625B1 (fr) Traitement de pâtes papetières chimiques par le peroxyde d'hydrogène en vue de leur blanchiment
EP0578305B1 (fr) Procédé pour la délignification d'une pâte à papier chimique
FR2467261A1 (fr) Blanchiment de matiere lignocellulosique au moyen d'agents de blanchiment contenant du peroxyde
CA1206704A (fr) Procede pour le traitement de pates papetieres chimiques
FR2641010A1 (enrdf_load_stackoverflow)
EP0148712B1 (fr) Procédé de blanchiment de pâtes papetières par le peroxyde d'hydrogène
EP0553141B1 (fr) Procede pour la preservation des caracteristiques de resistance mecanique des pates a papier chimiques
EP0446110B1 (fr) Procédé de préparation de pâtes à haut rendement blanchies
FR2661431A1 (fr) Procede de blanchiment au peroxyde de l'hydrogene de pates a papier a haut rendement.
FR2910027A1 (fr) Procede de blanchiment des pates papeteries chimiques par traitement final a l'ozone a haute temperature
BE1004674A3 (fr) Procede pour le blanchiment d'une pate a papier chimique et application de ce procede au blanchiment d'une pate kraft.
CA2200486C (fr) Procede de delignification et de blanchiment de pates a papier chimiques
EP0351330B1 (fr) Procédé de fabrication de pâtes chimicothermomécaniques blanchies
EP3008240B1 (fr) Procede de traitement des pates papetieres chimiques par traitement a l'ozone en presence d'ions magnesium
EP0307295B1 (fr) Procédé de fabrication de pâte à papier blanchie comportant un traitement à l'aide d'acide carbonique après blanchiment
FR2553444A1 (fr) Traitement a l'hypochlorite de pates papetieres chimiques
FR2568605A1 (fr) Perfectionnements a la delignification de pate a papier.
EP0222674B1 (fr) Procédé de blanchiment de pâtes papetières chimiques
RU2097462C1 (ru) Способ делигнификации и отбеливания лигноцеллюлозосодержащей пульпы
FR2593527A1 (fr) Procede de blanchiment des pates mecaniques.
BE1011129A4 (fr) Procede continu de delignification et/ou de blanchiment de pate a papier chimique vierge ou recyclee.
BE1005800A3 (fr) Procede pour la delignification et le blanchiment d'une pate a papier chimique.
FR2626020A1 (fr) Procede ameliore de blanchiment de fibres cellulosiques a l'aide de peroxyde d'hydrogene en milieu alcalin
BE1005094A3 (fr) Procede pour la preservation des caracteristiques de resistance mecanique des pates a papier chimiques et application de ce procede au blanchiment et a la delignification des pates kraft.
BE1010880A3 (fr) Procede de fabrication de pate a papier chimique.

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: 19860530

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE DE FR IT SE

17Q First examination report despatched

Effective date: 19870714

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE DE FR IT SE

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 FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRE;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.SCRIBED TIME-LIMIT

Effective date: 19880217

Ref country code: AT

Effective date: 19880217

REF Corresponds to:

Ref document number: 32534

Country of ref document: AT

Date of ref document: 19880315

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3660024

Country of ref document: DE

Date of ref document: 19880324

BERE Be: lapsed

Owner name: ATOCHEM

Effective date: 19880531

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: BE

Effective date: 19890531

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

Ref country code: FR

Payment date: 19940511

Year of fee payment: 9

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

Ref country code: SE

Payment date: 19940517

Year of fee payment: 9

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

Ref country code: DE

Payment date: 19940524

Year of fee payment: 9

EAL Se: european patent in force in sweden

Ref document number: 86420138.9

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

Ref country code: SE

Effective date: 19950528

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

Ref country code: DE

Effective date: 19960201

EUG Se: european patent has lapsed

Ref document number: 86420138.9

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

Ref country code: FR

Effective date: 19960229

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST