EP0014753A1 - Procédé pour l'amélioration de la couleur et la désodorisation d'une pâte au sulfate - Google Patents

Procédé pour l'amélioration de la couleur et la désodorisation d'une pâte au sulfate Download PDF

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Publication number
EP0014753A1
EP0014753A1 EP79104899A EP79104899A EP0014753A1 EP 0014753 A1 EP0014753 A1 EP 0014753A1 EP 79104899 A EP79104899 A EP 79104899A EP 79104899 A EP79104899 A EP 79104899A EP 0014753 A1 EP0014753 A1 EP 0014753A1
Authority
EP
European Patent Office
Prior art keywords
pulp
peroxide
sulfate
kraft
deodorisation
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.)
Granted
Application number
EP79104899A
Other languages
German (de)
English (en)
Other versions
EP0014753B1 (fr
Inventor
Horst Dr. Krüger
Wilhelm Dr. Berndt
Jakob Wink
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.)
Evonik Operations GmbH
Original Assignee
Degussa GmbH
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6063083&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0014753(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Degussa GmbH filed Critical Degussa GmbH
Priority to AT79104899T priority Critical patent/ATE2019T1/de
Publication of EP0014753A1 publication Critical patent/EP0014753A1/fr
Application granted granted Critical
Publication of EP0014753B1 publication Critical patent/EP0014753B1/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

  • Pulp which was produced by the Kraft or sulfate process, are characterized by excellent technological properties. After bleaching, they are used in large quantities for paper production.
  • the fuel or sulfate pulp In the unbleached state, the fuel or sulfate pulp is used in a not inconsiderable amount for the production of packaging materials, e.g. Cardboard boxes used. Because of its very high strength properties, the kraft or sulfate pulp is particularly suitable for packaging in which heavy mechanical stress must be expected.
  • the unbleached kraft or sulfate pulp has significant disadvantages which undesirably severely limit its use for the production of packaging material.
  • sulphate cooking produces intensely smelling sulfur-containing compounds, e.g. Ethyl and methyl mercaptan, which give the kraft or sulfate pulp a characteristic smell and cannot be removed with sufficient certainty during washing and drying.
  • sulfur-containing compounds e.g. Ethyl and methyl mercaptan
  • These properties of the fuel or sulfate pulp have a particularly disadvantageous effect on food packaging, so that hitherto the unbleached fuel or sulfate pulp has been used for this purpose, e.g. for milk packaging, is not possible.
  • the invention relates to a process for lightening and deodorising fuel or sulfate pulp, which is characterized in that after the sulfate boil during stock preparation in the area of a diffusion wash using the residual alkalinity of the pulp suspension still present in the pulp after the alkaline boil a peroxide in an amount of 0, 05-3 Gev .-% (based on 100% peroxide), based on absolutely dry pulp, is added.
  • Hydrogen peroxide in aqueous solution is preferably used as the peroxide.
  • the residual alkalinity of the cellulose suspension at the beginning of the addition of the peroxide can correspond to a degree of leaching of from 0.2 to 1.8% by weight of Na 2 SO 4 , preferably from 1.2 to 1.5% by weight of Na 2 SO 4 .
  • the process according to the invention can be carried out at material densities in the range from 3 to 20% by weight and at temperatures in the range from 4o to 90 ° C.
  • a temperature of 6o to 70 ° C is special advantageous.
  • the storage time of the pulp can moreover be between 1 to 25 hours and in an advantageous embodiment 7 to 15 hours.
  • the peroxide consumption is too rapid and the result is poor.
  • Inorganic or organic acids which do not contain reducing components can be used as the acid.
  • Sulfuric acid can advantageously be used.
  • the process according to the invention is surprisingly possible in the phase of the kraft or sulfate pulp production process described, although known formulations for pulp bleaching with peroxide do not achieve adequate results in this phase of the pulp production process. It: therefore there is a generally held opinion that remaining from the cooking, not washed oxidizable shares to premature peroxide led and made a bleach impossible.
  • peroxide bleaching is possible in the described phase of the kraft or sulfate pulp production process if one does not add the sodium hydroxide solution that is otherwise absolutely necessary for peroxide bleaching. It is also possible to dispense with the use of known bleach stabilizers.
  • the kraft or sulfate pulp treated by means of the method according to the invention can easily be used as a material for food packaging, e.g. Milk packs.
  • the sulfate pulp produced in a continuous cooker is passed through a final Vasch filter after it has passed through the usual sorting and washing operations, on which it is obtained with a degree of washing out of 1.2 to 1.5% Na 2 SO 4 .
  • the substance is thickened on the filter at 15% consistency, it falls with 7 0 0 C in a screw and pumped into a thick pulp tower, in which it supports 7 to 2o hours (diffusion Sturm).
  • the fabric has a white content of 26.5.
  • cochlea of a 1 0% aqueous hydrogen peroxide solution are distributed uniformly by means of a drip tray 1.5oo l / h.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Artificial Filaments (AREA)
  • Saccharide Compounds (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
EP79104899A 1979-02-16 1979-12-04 Procédé pour l'amélioration de la couleur et la désodorisation d'une pâte au sulfate Expired EP0014753B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT79104899T ATE2019T1 (de) 1979-02-16 1979-12-04 Verfahren zur farbverbesserung und desodorierung von sulfatzellstoff.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2905936 1979-02-16
DE2905936A DE2905936B1 (de) 1979-02-16 1979-02-16 Verfahren zum Aufhellen und Desodorieren von Sulfatzellstoff

Publications (2)

Publication Number Publication Date
EP0014753A1 true EP0014753A1 (fr) 1980-09-03
EP0014753B1 EP0014753B1 (fr) 1982-12-15

Family

ID=6063083

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79104899A Expired EP0014753B1 (fr) 1979-02-16 1979-12-04 Procédé pour l'amélioration de la couleur et la désodorisation d'une pâte au sulfate

Country Status (6)

Country Link
EP (1) EP0014753B1 (fr)
AT (1) ATE2019T1 (fr)
CA (1) CA1129157A (fr)
DE (2) DE2905936B1 (fr)
FI (1) FI68684C (fr)
NO (1) NO793959L (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0073872A1 (fr) * 1981-09-03 1983-03-16 Billerud Uddeholm AB Procédé chimique dans la fabrication du papier
EP0076788A1 (fr) * 1981-09-22 1983-04-13 Holmens Bruk Aktiebolag Usage de substances dégageant de l'oxygène pour la réduction de la coloration foncée d'une pâte
FR2533947A1 (fr) * 1982-08-05 1984-04-06 Honshu Paper Co Ltd Procede de fabrication de papier et matieres d'emballage pour envelopper des produits metalliques

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2504375C1 (ru) * 2012-05-23 2014-01-20 Галина Викторовна Сукоян Фармацевтический состав для лечения заболеваний, связанных с эндотелиальной дисфункцией

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1454339A (en) * 1921-11-28 1923-05-08 Brown Co Method of treating cellulose pulp to remove odors therefrom
US1632802A (en) * 1926-08-10 1927-06-21 Brown Co Process of and apparatus for treating fiber
US1774403A (en) * 1926-09-16 1930-08-26 Brown Co Process of producing fiber of high alpha cellulose content
DE2710806A1 (de) * 1976-03-12 1977-09-15 Interox Verfahren zur desinfektion von altpapier

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2030384A (en) * 1934-10-18 1936-02-11 Nekoosa Edwards Paper Co Method of bleaching pulp
BE450336A (fr) * 1942-12-09 1943-05-31
FR2192981B1 (fr) * 1972-07-21 1988-11-10 Air Liquide Fr

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1454339A (en) * 1921-11-28 1923-05-08 Brown Co Method of treating cellulose pulp to remove odors therefrom
US1632802A (en) * 1926-08-10 1927-06-21 Brown Co Process of and apparatus for treating fiber
US1774403A (en) * 1926-09-16 1930-08-26 Brown Co Process of producing fiber of high alpha cellulose content
DE2710806A1 (de) * 1976-03-12 1977-09-15 Interox Verfahren zur desinfektion von altpapier

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0073872A1 (fr) * 1981-09-03 1983-03-16 Billerud Uddeholm AB Procédé chimique dans la fabrication du papier
EP0076788A1 (fr) * 1981-09-22 1983-04-13 Holmens Bruk Aktiebolag Usage de substances dégageant de l'oxygène pour la réduction de la coloration foncée d'une pâte
FR2533947A1 (fr) * 1982-08-05 1984-04-06 Honshu Paper Co Ltd Procede de fabrication de papier et matieres d'emballage pour envelopper des produits metalliques
GB2158474A (en) * 1982-08-05 1985-11-13 Honshu Paper Co Ltd For packaging metallic material

Also Published As

Publication number Publication date
FI793720A (fi) 1980-08-17
DE2964319D1 (en) 1983-01-20
FI68684B (fi) 1985-06-28
CA1129157A (fr) 1982-08-10
ATE2019T1 (de) 1982-12-15
EP0014753B1 (fr) 1982-12-15
DE2905936B1 (de) 1980-04-30
FI68684C (fi) 1985-10-10
NO793959L (no) 1980-08-19

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