EP0456032A1 - Verfahren zum Bleichen von Zellstoff - Google Patents

Verfahren zum Bleichen von Zellstoff Download PDF

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Publication number
EP0456032A1
EP0456032A1 EP91106496A EP91106496A EP0456032A1 EP 0456032 A1 EP0456032 A1 EP 0456032A1 EP 91106496 A EP91106496 A EP 91106496A EP 91106496 A EP91106496 A EP 91106496A EP 0456032 A1 EP0456032 A1 EP 0456032A1
Authority
EP
European Patent Office
Prior art keywords
bleaching
pulp
peroxide
sodium
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.)
Withdrawn
Application number
EP91106496A
Other languages
English (en)
French (fr)
Inventor
Dr. Endo Hajime
Toshiyuki Aoki
Takashi Hamada
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.)
MiKi Co Ltd
Sanofi Aventis KK
Original Assignee
Hoechst Japan Ltd
MiKi Co Ltd
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 Hoechst Japan Ltd, MiKi Co Ltd filed Critical Hoechst Japan Ltd
Publication of EP0456032A1 publication Critical patent/EP0456032A1/de
Withdrawn legal-status Critical Current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
    • 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
    • D21C9/1026—Other features in bleaching processes
    • D21C9/1036—Use of compounds accelerating or improving the efficiency of the processes

Definitions

  • the present invention relates to a process for bleaching pulps, such as wood pulp and regenerated pulp, which can be realized at lower temperatures within a short period of time.
  • Peroxidic bleaching liquors conventionally employed have, in general, additives inclusive of sequestering agent, for example, a metal chelating agent, such as sodium diethylenetriaminepentaacetate (DTPA), tetra- and disodium ethylenediaminetetraacetate (EDTA), nitrilotriacetic acid (NTA) and so on, and magnesium sulfate, sodium silicate of commercial grade No. 3 and so on, for preventing useless decomposition of the peroxide under the bleaching condition due to the presence of contaminant trace metals of natural occurrence or delivered from waste paper.
  • a metal chelating agent such as sodium diethylenetriaminepentaacetate (DTPA), tetra- and disodium ethylenediaminetetraacetate (EDTA), nitrilotriacetic acid (NTA) and so on
  • DTPA sodium diethylenetriaminepentaacetate
  • EDTA tetra- and disodium ethylenediaminetetra
  • sodium silicate of commercial grade No. 3 functions also as a buffer and stabilizes the pH of the bleaching solution, in addition to the function of preventing useless decomposition of the peroxide. It has been confirmed further that sodium silicate of commercial grade No. 3 causes the formation of a protective coating film on the surface of metals, thus preventing corrosion of the metal.
  • the conditions for bleaching include, in general, a longer bleaching duration of 1-4 hours at 40-70°C and a solution pH of 10-11.
  • the conditions include, in general, a bleaching duration of 20-30 minutes at 75-85°C.
  • a bleaching duration of 4-3 hours at 40-60°C is required at each concentration of the peroxide used.
  • the object of the present invention is to provide a process for bleaching pulps that is able to be carried out at a lower temperature within a shorter operation duration as compared with the conventional technique.
  • a process for bleaching pulps with a peroxide which method comprises use of, as an additional component, an activator which liberates active or nascent oxygen upon reaction with the peroxide.
  • maximum whiteness at each concentration of the peroxide can be attained within a very short period of time, say, 5-60 minutes at a relatively low temperature of 5-70°C, referably 20-60°C.
  • Fig. 1 is a graph showing the relationship between the whiteness of the bleached pulp and the bleaching duration based on the experimental results of Example according to the present invention and Comparison Example according to the prior technique.
  • Pulps to be bleached by the method according to the present invention include every sort of pulp, such as those enumerated previously.
  • peroxide for example, hydrogen peroxide and various inorganic peroxides, such as sodium peroxide, sodium and potassium salts of percarbonate, perborate, persulfate and perphosphate.
  • inorganic peroxides such as sodium peroxide, sodium and potassium salts of percarbonate, perborate, persulfate and perphosphate.
  • the activator to be employed in the method according to the present invention encompasses various known compounds. It includes N-acyl compounds, such as tetraacetylethylenediamine (TAED), tetraacetylmethylmethylenediamine, tetraacetylglycol uril (TAGU) and so on, and activated esters, such as pentaacetylglucose (PAG), sodium acetoxybenzenesulfonate, sodium nonanoyloxybenzenesulfonate (NOBS), sodium benzoyloxybenzenesulfonate (BOBS) and so on. Above all, tetraacetylethylenediamine (TAED) is particularly advantageous.
  • TAED tetraacetylethylenediamine
  • TAGU tetraacetylmethylmethylenediamine
  • TAGU tetraacetylglycol uril
  • activated esters such as pentaacetylglu
  • additional components other than the peroxide and the activator can be employed, such as for example, conventional additives employed in the prior bleaching technique, i. e., additives for preventing the useless decomposition of the peroxide under the bleaching condition in the presence of contaminant metals of natural occurrence or originated from waste papers to be regenerated including a sequestering agent, such as, a metal chelating agent, for example, sodium diethylenetriaminepentaacetate (DTPA), tetra- and disodium ethylenediaminetetraacetates (EDTA), nitrilotriacetic acid (NTA) and so on, and magnesium sulfate, sodium silicate of commercial grade No. 3 and so on, as well as a pH regulator, corrosion inhibitors for various metals and so on.
  • a sequestering agent such as, a metal chelating agent, for example, sodium diethylenetriaminepentaacetate (DTPA), tetra- and disodium ethylenediaminete
  • the pH value of the bleaching solution at the start of bleaching by the method according to the present invention may preferably be in the range from 8 to 12, the highest bleaching effect being attained, in particular, in the pH range of 9-10.
  • various inorganic alkaline compounds such as caustic soda, sodium silicate of commercial grade No. 3, sodium sulfite and so on.
  • the activator may be added to the bleaching solution either before the addition of the peroxide and during the step of adding the metal chelating agent, pH regulator and so on, or at the same time with or after the addition of the peroxide.
  • (O) represents the active oxygen nascent oxygen, which brings about an efficient bleaching.
  • the amount of hydrogen peroxide, calculated as pure substance is, in general, in the range from 0.3 to 10 %.
  • the lower limit of the amount of hydrogen peroxide can be reduced to 0.05%; Therefore, the amount of TAED to be employed in the method according to the present invention will, theoretically, be in the range from 3.35 times 0.05% to 3.35 times 10 %.
  • a pulp used for papers for domestic uses is obtained from waste papers of high quality and medium quality papers and of simili paper.
  • the so-called globe kettle method may be employed. This method comprises treating the raw stock of waste papers in the kettle by cooking under the condition of high temperature (130-140°C) and high pressure using a digesting agent and a bleaching agent at a pulp concentration of 15-25% for 4-5 hours.
  • the activator does not serve for any acceleration of decomposition of the peroxide, but does serve for the generation of active oxygen from the peroxide efficiently for realizing the bleaching and, thus, reducing the bleaching time.
  • the advantages realized by the present invention exist in that the energy cost can be reduced, the pulp bleaching apparatus can be designed compactly and the bleaching performance per unit operation time can be increased.
  • the present invention provides a marked contribution to the industry by the attainment of capability of realizing bleaching of pulps at lower bleaching temperature within a very short bleaching time.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Detergent Compositions (AREA)
EP91106496A 1990-04-25 1991-04-23 Verfahren zum Bleichen von Zellstoff Withdrawn EP0456032A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2107397A JPH04108192A (ja) 1990-04-25 1990-04-25 パルプの漂白法
JP107397/90 1990-04-25

Publications (1)

Publication Number Publication Date
EP0456032A1 true EP0456032A1 (de) 1991-11-13

Family

ID=14458110

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91106496A Withdrawn EP0456032A1 (de) 1990-04-25 1991-04-23 Verfahren zum Bleichen von Zellstoff

Country Status (5)

Country Link
EP (1) EP0456032A1 (de)
JP (1) JPH04108192A (de)
CA (1) CA2041468A1 (de)
FI (1) FI911963A (de)
NO (1) NO911626L (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0634521A1 (de) * 1993-07-16 1995-01-18 Eka Nobel Ab Verfahren zum Bleichen von Lignozellulose-enthaltende Fasern
WO1995021290A1 (en) * 1994-02-07 1995-08-10 Warwick International Group Limited Pulp bleaching
GB2304126A (en) * 1995-08-10 1997-03-12 Warwick Int Group Pulp treatment process
WO1998011294A1 (en) * 1996-09-13 1998-03-19 R-J Holding Company Delignification process
WO2000069778A1 (en) * 1999-05-17 2000-11-23 Buckman Laboratories International, Inc. Methods of using percarboxylic acid or anions thereof and methods of making the same
WO2001046519A1 (en) * 1999-12-22 2001-06-28 Warwick International Group Limited Peroxyacid delivery process
EP1607519A1 (de) * 2004-06-14 2005-12-21 Warwick International Group Limited Aktivator zum Zellstoffbleichen
DE102009045628A1 (de) 2009-10-13 2011-04-14 Henkel Ag & Co. Kgaa Bleichaktivatoren für Verfahren zum Bleichen von cellulosischen Faserstoffen
WO2012037024A3 (en) * 2010-09-16 2012-08-23 Georgia-Pacific Consumer Products Lp High brightness pulps from lignin rich waste papers
US9476014B2 (en) 2013-02-14 2016-10-25 II Joseph M. Galimi Method for cleaning surfaces
CN116179010A (zh) * 2023-02-28 2023-05-30 江苏理文造纸有限公司 一种油墨脱墨剂及其制备方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3687803A (en) * 1970-11-09 1972-08-29 American Cyanamid Co Acid chloride activators for hydrogen peroxide bleaching
GB1383741A (en) * 1971-04-13 1974-02-12 Ciba Geigy Ag Stabilisation of per-compounds

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3687803A (en) * 1970-11-09 1972-08-29 American Cyanamid Co Acid chloride activators for hydrogen peroxide bleaching
GB1383741A (en) * 1971-04-13 1974-02-12 Ciba Geigy Ag Stabilisation of per-compounds

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Journal f. prakt. Chemie vol. 332, no. 2, 1990, Leipzig, Germany pages 176 - 180; Hofmann,J. et al.: "Bleaching activators as acylating agents. Kinetics of the acetylation of piperidine by some bleaching activators." *

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0634521A1 (de) * 1993-07-16 1995-01-18 Eka Nobel Ab Verfahren zum Bleichen von Lignozellulose-enthaltende Fasern
WO1995021290A1 (en) * 1994-02-07 1995-08-10 Warwick International Group Limited Pulp bleaching
GB2304126A (en) * 1995-08-10 1997-03-12 Warwick Int Group Pulp treatment process
WO1998011294A1 (en) * 1996-09-13 1998-03-19 R-J Holding Company Delignification process
WO2000069778A1 (en) * 1999-05-17 2000-11-23 Buckman Laboratories International, Inc. Methods of using percarboxylic acid or anions thereof and methods of making the same
WO2001046519A1 (en) * 1999-12-22 2001-06-28 Warwick International Group Limited Peroxyacid delivery process
EP1607519A1 (de) * 2004-06-14 2005-12-21 Warwick International Group Limited Aktivator zum Zellstoffbleichen
WO2005121443A1 (en) * 2004-06-14 2005-12-22 Warwick International Group Limited Activator for pulp bleaching
DE102009045628A1 (de) 2009-10-13 2011-04-14 Henkel Ag & Co. Kgaa Bleichaktivatoren für Verfahren zum Bleichen von cellulosischen Faserstoffen
EP2314761A1 (de) 2009-10-13 2011-04-27 Henkel AG & Co. KGaA Bleichaktivatoren für Verfahren zum Bleichen von cellulosischen Faserstoffen
WO2012037024A3 (en) * 2010-09-16 2012-08-23 Georgia-Pacific Consumer Products Lp High brightness pulps from lignin rich waste papers
US8845860B2 (en) 2010-09-16 2014-09-30 Georgia-Pacific Consumer Products Lp High brightness pulps from lignin rich waste papers
US9476014B2 (en) 2013-02-14 2016-10-25 II Joseph M. Galimi Method for cleaning surfaces
CN116179010A (zh) * 2023-02-28 2023-05-30 江苏理文造纸有限公司 一种油墨脱墨剂及其制备方法
CN116179010B (zh) * 2023-02-28 2024-04-02 江苏理文造纸有限公司 一种油墨脱墨剂及其制备方法

Also Published As

Publication number Publication date
NO911626D0 (no) 1991-04-24
NO911626L (no) 1991-10-28
CA2041468A1 (en) 1991-10-26
FI911963A (fi) 1991-10-26
JPH04108192A (ja) 1992-04-09
FI911963A0 (fi) 1991-04-23

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