EP0285530B1 - Verfahren zum Bleichen von Zellstoffen - Google Patents

Verfahren zum Bleichen von Zellstoffen Download PDF

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Publication number
EP0285530B1
EP0285530B1 EP88420102A EP88420102A EP0285530B1 EP 0285530 B1 EP0285530 B1 EP 0285530B1 EP 88420102 A EP88420102 A EP 88420102A EP 88420102 A EP88420102 A EP 88420102A EP 0285530 B1 EP0285530 B1 EP 0285530B1
Authority
EP
European Patent Office
Prior art keywords
hydrogen peroxide
process according
complexing
temperature
sequestering agent
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 - Lifetime
Application number
EP88420102A
Other languages
English (en)
French (fr)
Other versions
EP0285530A1 (de
Inventor
Michel Devic
Jacques Kervennal
Jean-Pierre Schirmann
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
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 Elf Atochem SA filed Critical Elf Atochem SA
Priority to AT88420102T priority Critical patent/ATE84581T1/de
Publication of EP0285530A1 publication Critical patent/EP0285530A1/de
Application granted granted Critical
Publication of EP0285530B1 publication Critical patent/EP0285530B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • D21C9/1005—Pretreatment of the pulp, e.g. degassing the pulp

Definitions

  • the present invention relates to bleaching using hydrogen peroxide from mechanical, thermomechanical, chemo-mechanical, chemo-thermal pulp in the pulp and related fields.
  • the dry matter yield of such an operation is always very high and can reach and even exceed 90%.
  • the purpose of the process of the present invention is to provide better bleaching than that described in FR 1159573.
  • the complexing or sequestering agent In the treatment with the complexing or sequestering agent, the latter is used in an amount of approximately 0.1% to 1% by weight of the weight of dry pulp. Unless specified or obvious, the quantities of products in all that follow are also expressed in percent by weight of the weight of dry dough.
  • the complexing or sequestering agent is most often chosen from sodium tripolyphosphate, sodium tetrapyrophosphate, sodium salts of citric acids, nitrilotriacetic, ethylenediaminetetraacetic, diethylenetriaminepentaacetic.
  • the treatment with the complexing or sequestering agent is most generally carried out at a pH value of between 4 and 8, the result of the invention then not depending on such a value.
  • the consistency, percentage by weight of dough in the dry state in the treatment medium can, in the present treatment using a complexing or sequestering agent, vary within fairly wide limits, approximately 5% to 30% . It is most often between about 10% and 15% to best reconcile economy and efficiency of subsequent washing.
  • the duration of treatment with a complexing or sequestering agent depends on the other parameters. It is generally between approximately 5 minutes and 2 hours.
  • washing is meant the operation which consists in eliminating more or less completely and here effectively the liquid present in the dough. This elimination is carried out for example by pressing the dough on a filter or by means of a dilution-pressing sequence of the dough, repeated or not, in which the dilution is very generally ensured by water.
  • the washing which follows the treatment by means of a complexing or sequestering agent is most often carried out at a temperature generally between approximately 20 ° C. and 90 ° C., often between 20 ° C. and 60 ° C. for essentially economic reasons.
  • efficiency is meant, expressed in percent, the degree of elimination of the liquid phase present before washing in the dough.
  • the amount of hydrogen peroxide used is that commonly accepted in the traditional bleaching of mechanical pulps and is therefore between approximately 0.5% and 10%, most often not less than approximately 2%.
  • the alkaline agent present with the hydrogen peroxide which is very suitable for carrying out the invention is sodium hydroxide used most often at a rate of approximately 0.25% to 5% with a weight ratio of sodium hydroxide / hydrogen peroxide preferably between 0.2 and 1.
  • the invention allows a duration of action of hydrogen peroxide both long enough to allow this product to fully develop its effectiveness, and advantageously reduced compared to that of traditional bleaching. It usually does not exceed 15 minutes and often even around 5 minutes.
  • hydrogen peroxide exerts its action in a medium at a pressure practically equal to the pressure of saturated steam at the chosen temperature. This pressure is most often between 2 bar absolute and 40 bar absolute.
  • the consistency of the paste as placed in the presence of hydrogen peroxide is preferably chosen to be as high as possible, remaining compatible with the production of a mixture of satisfactory homogeneity of the paste with the other products present.
  • This quality of the mixture means that the consistency is generally limited to a value of not more than about 30%, or even 25%. However, it is rarely less than preferably around 10%.
  • the present invention leads to high results in bleaching pulps of mechanical origin without the presence of compounds having a stabilizing effect for hydrogen peroxide being essential to the effectiveness of its action. This can however be improved by the presence of such compounds such as for example, the sodium silicate used most often at a rate of approximately 2% to 6%, the magnesium salts such as the magnesium sulphate used in an amount generally included. between 0.05% and 0.5%, derivatives of poly ( ⁇ -hydroxyacrylic acid) used at a rate of approximately 0.05% to 2%, such as the products Clarene®.
  • the process of the invention can be carried out batchwise or continuously in any installation comprising mainly mixing equipment, generally of the kneader type, in which the treatment can be carried out using the complexing or sequestering agent and the mixing of the initial paste or washed with hydrogen peroxide and the alkaline agent, washing equipment such as, for example, filters, presses, finally, for the stage of action of hydrogen peroxide, pressure resistant equipment and impervious to water vapor, such as a tubular reactor equipped for example with a screw type dough progression system or an autoclave.
  • washing equipment such as, for example, filters, presses, finally, for the stage of action of hydrogen peroxide, pressure resistant equipment and impervious to water vapor, such as a tubular reactor equipped for example with a screw type dough progression system or an autoclave.
  • Each of the examples relates to the bleaching of 100 g of softwood millstone pulp with a white degree equal to 53.7% and a dry weight equal to 38.2 g.
  • H2O2 NaOH Silicate LS Degree of white H2O2 consumed 1 145 5 5 2 78.5 2.55 2 145 5 5 2 4 80 2.3 3 145 5 5 4 0.5 81 3.2 4 145 15 5 2 77 3 5 180 2 3 2 75.5 1.8 5c 180 2 3 2 70 2.45 6 180 2 5 2 77 2.4 7 180 2 10 2 78.5 4 7c 180 2 10 2 75.5 4 8 180 2 10 4 79 8 9 180 2 10 4 0.5 82.5 4.7 10 245 1 5 2 77.5 3.05 11 245 1 5 4 0.5 79 3.25
  • the process according to the invention makes it possible to achieve a very improved degree of whiteness, which may be in the region of 80% and even considerably exceed this value under the favored conditions of production.
  • This improvement is accompanied by a significant reduction in the consumption of hydrogen peroxide or, at the very least, practically does not increase it.
  • a given degree of white is achieved with a substantial saving of hydrogen peroxide.
  • Each of the examples relates to the bleaching of 100 g of chemothermal-mechanical pulp with sulphite with a white degree equal to 59.6% and a dry weight equal to 40 g.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Detergent Compositions (AREA)
  • Dental Preparations (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Glass Compositions (AREA)
  • Noodles (AREA)
  • Seasonings (AREA)

Claims (10)

  1. Verfahren zum Bleichen von Stoffbrei mechanischen Ursprungs, welches nicht gemeinsam mit einer mechanischen Zerfaserung erfolgt und bei dem Wasserstoffperoxid in Gegenwart von einem alkalischen Agens und gesättigtem Wasserdampf einwirkt, dadurch gekennzeichnet, daß der Stoffbrei mit Hilfe eines Komplexierungsmittels oder Maskierungsmittels für Metalle bei einem pH unterhalb oder gleich 9 behandelt wird, dann mit einer Effektivität von mehr als 95 % gewaschen wird und schließlich der Einwirkung von Wasserstoffperoxid bei einer Temperatur zwischen 145°C und 245°C bei dem Druck von gesättigtem Wasserdampf bei dieser Temperatur für eine Dauer von zwischen 1 und 30 Minuten ausgesetzt wird.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Menge des Komplexierungsmittels oder Maskierungsmittels zwischen 0,1 und 1 % beträgt.
  3. Verfahren nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß die Behandlung mittels des Komplexierungsmittels oder Maskierungsmittels bei einem pH zwischen 6 und 8 durchgeführt wird.
  4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Behandlung mittels des Komplexierungsmittels oder Maskierungsmittels bei einer Temperatur zwischen 50°C und 95°C durchgeführt wird.
  5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Waschvorgang bei einer Temperatur zwischen 20°C und 90°C ausgeführt wird.
  6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Menge an Wasserstoffperoxid zwischen 2 % und 10 % liegt.
  7. Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß das alkalische Agens, das anwesend ist, wenn das Wasserstoffperoxid einwirkt, Natriumhydroxid ist, das in einer Menge von 0,25 % bis 5 % eingesetzt wird, mit einem Gewichtsverhältnis, bezogen auf das Wasserstoffperoxid, von 0,2 bis 1.
  8. Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Dauer der Einwirkung des Wasserstoffperoxids kürzer oder gleich 10 Minuten ist.
  9. Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß das Wasserstoffperoxid in Gegenwart einer Verbindung einwirkt, die auf dieses einen stabilisierenden Effekt ausübt.
  10. Verfahren nach Anspruch 9, dadurch gekennzeichnet, daß die Verbindung mit stabilisierendem Effekt ausgewählt wird aus Natriumsilikat, den Magnesiumsalzen, den Derivaten von Poly(α-hydroxyacryl)säure.
EP88420102A 1987-04-02 1988-03-29 Verfahren zum Bleichen von Zellstoffen Expired - Lifetime EP0285530B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88420102T ATE84581T1 (de) 1987-04-02 1988-03-29 Verfahren zum bleichen von zellstoffen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8704844 1987-04-02
FR8704844A FR2613388B1 (fr) 1987-04-02 1987-04-02 Procede de blanchiment de pates

Publications (2)

Publication Number Publication Date
EP0285530A1 EP0285530A1 (de) 1988-10-05
EP0285530B1 true EP0285530B1 (de) 1993-01-13

Family

ID=9349862

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88420102A Expired - Lifetime EP0285530B1 (de) 1987-04-02 1988-03-29 Verfahren zum Bleichen von Zellstoffen

Country Status (11)

Country Link
EP (1) EP0285530B1 (de)
JP (1) JPS63256786A (de)
AT (1) ATE84581T1 (de)
AU (1) AU606930B2 (de)
CA (1) CA1310797C (de)
DE (2) DE285530T1 (de)
ES (1) ES2004846T3 (de)
FI (1) FI93749C (de)
FR (1) FR2613388B1 (de)
NO (1) NO173886C (de)
NZ (1) NZ224144A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LT3269B (en) 1989-06-06 1995-05-25 Eka Nobel Ab Process for bleaching of lignocellulose-containing pulps

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2647641B1 (fr) * 1989-06-05 1992-01-17 Atochem Procede de fabrication de pulpes vegetales blanchies
ATE97179T1 (de) * 1989-06-06 1993-11-15 Eka Nobel Ab Verfahren zum bleichen von lignocellulose enthaltenden zellstoffen.
FR2659363B1 (fr) * 1990-03-07 1996-04-19 Atochem Procede de preparation de pates a haut rendement blanchies.
SE466061B (sv) * 1990-04-23 1991-12-09 Eka Nobel Ab Blekning av kemisk massa genom behandling med foerst ett komplexbildande aemne och sedan ett peroxidinnehaallande aemne
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.
FR2661430B1 (fr) * 1990-04-30 1992-07-17 Atochem Procede de blanchiment au peroxyde d'hydrogene de pates a papier a haut rendement.
SE468355B (sv) * 1991-04-30 1992-12-21 Eka Nobel Ab Blekning av kemisk massa genom behandling med komplexbildare och ozon
ZA955290B (en) * 1994-07-11 1996-12-27 Ingersoll Rand Co Peroxide bleaching process for cellulosic and lignocellulosic material
AU2003279120A1 (en) * 2003-10-02 2005-05-19 Andritz Inc. Multi-stage ap mechanical pulping with refiner flow line treatment
US8298373B2 (en) 2008-02-07 2012-10-30 University Of New Brunswick Combined process of peroxide bleaching of wood pulps and addition of optical brightening agents

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL202075A (de) * 1954-11-19 Fmc Corp
US3251731A (en) * 1963-02-11 1966-05-17 Andrew J Gard Bleaching of wood pulp with a sequestering agent and hydrogen peroxide
JPS5344563A (en) * 1976-10-05 1978-04-21 Ouchi Shinkou Kagaku Kougiyou Preparation of benzothiazolylsulfenamide
FI61215B (fi) * 1976-11-23 1982-02-26 Defibrator Ab Saett och anordning att kontinuerligt framstaella lignocellulosahaltiga fibermaterial

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LT3269B (en) 1989-06-06 1995-05-25 Eka Nobel Ab Process for bleaching of lignocellulose-containing pulps

Also Published As

Publication number Publication date
ES2004846A4 (es) 1989-02-16
FI93749B (fi) 1995-02-15
NO881404D0 (no) 1988-03-29
NO173886C (no) 1994-02-16
NO881404L (no) 1988-10-03
FI881544A0 (fi) 1988-03-31
FI93749C (fi) 1995-05-26
FR2613388B1 (fr) 1990-05-04
FR2613388A1 (fr) 1988-10-07
NZ224144A (en) 1989-07-27
NO173886B (no) 1993-11-08
ES2004846T3 (es) 1993-06-16
ATE84581T1 (de) 1993-01-15
AU1406788A (en) 1988-10-06
FI881544A (fi) 1988-10-03
DE3877403D1 (de) 1993-02-25
AU606930B2 (en) 1991-02-21
JPH0156197B2 (de) 1989-11-29
JPS63256786A (ja) 1988-10-24
DE285530T1 (de) 1989-03-30
DE3877403T2 (de) 1993-05-19
EP0285530A1 (de) 1988-10-05
CA1310797C (fr) 1992-12-01

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