EP0417411A1 - ProcédÀ© de stabilisation de la viscosité de matériaux cellulosiques - Google Patents

ProcédÀ© de stabilisation de la viscosité de matériaux cellulosiques Download PDF

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Publication number
EP0417411A1
EP0417411A1 EP90112190A EP90112190A EP0417411A1 EP 0417411 A1 EP0417411 A1 EP 0417411A1 EP 90112190 A EP90112190 A EP 90112190A EP 90112190 A EP90112190 A EP 90112190A EP 0417411 A1 EP0417411 A1 EP 0417411A1
Authority
EP
European Patent Office
Prior art keywords
viscosity
ozone
pulp
iso
strength
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.)
Ceased
Application number
EP90112190A
Other languages
German (de)
English (en)
Inventor
Hans Ulrich Dr. Süss
Wilfried Dr. Eul
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
Application filed by Degussa GmbH filed Critical Degussa GmbH
Publication of EP0417411A1 publication Critical patent/EP0417411A1/fr
Ceased 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
    • D21C9/1026—Other features in bleaching processes
    • D21C9/1036—Use of compounds accelerating or improving the efficiency of the processes
    • 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
    • D21C9/1047—Conserving the bleached pulp
    • 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
    • D21C9/147—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications
    • D21C9/153—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications with ozone
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution

Definitions

  • ozone is a very reactive and at the same time non-selective bleaching agent, side reactions such as the oxidation of cellulose cannot be avoided even with small amounts of ozone.
  • the resulting carbonyl groups increase the sensitivity of cellulose to alkaline degradation.
  • the object of the invention is to find a process in which, in comparison to the bleached using chlorine at low ozone doses, there is practically no decrease in the viscosity and even at higher concentrations, only a slight decrease in tolerance and pulps with a white content of about 90 (ISO) receives.
  • the invention relates to a method for stabilizing the viscosity of pulp following an ozone or ozone / oxygen treatment, which is characterized in that the pulp at a pH of 8 to 12 with 0.05 to 1 wt. % Formamidine sulfinic acid, based on dry cellulose, at 40 to 90 ° C, preferably 50 to 80 ° C, treated.
  • Alkaline and acidic sulfite pulps and kraft pulp based on softwood and hardwood are suitable as pulp for this process.
  • the ozone or ozone / oxygen treatment is generally carried out in an acidic medium at an ozone concentration of 0.1 to 4%, based on absolutely dry cellulose.
  • the formamidine sulfinic acid is used in the subsequent alkaline extraction step without additional equipment.
  • the pulp is between 5 and 10%, preferably 8 and 12%,
  • the normal residence time in this stage is generally sufficient to stabilize the viscosity.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
EP90112190A 1989-07-18 1990-06-27 ProcédÀ© de stabilisation de la viscosité de matériaux cellulosiques Ceased EP0417411A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3923728 1989-07-18
DE3923728A DE3923728A1 (de) 1989-07-18 1989-07-18 Verfahren zur stabilisierung der viskositaet von zellstoffen

Publications (1)

Publication Number Publication Date
EP0417411A1 true EP0417411A1 (fr) 1991-03-20

Family

ID=6385283

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90112190A Ceased EP0417411A1 (fr) 1989-07-18 1990-06-27 ProcédÀ© de stabilisation de la viscosité de matériaux cellulosiques

Country Status (6)

Country Link
US (1) US5073301A (fr)
EP (1) EP0417411A1 (fr)
BR (1) BR9003292A (fr)
CA (1) CA2021392A1 (fr)
DE (1) DE3923728A1 (fr)
FI (1) FI903433A0 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022103081A1 (de) 2022-02-09 2023-08-10 Jan Reijnvaan Paletten
DE102022103082A1 (de) 2022-02-09 2023-08-10 Jan Reijnvaan Palettenblöcke und Paletten

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69408065T2 (de) * 1993-04-06 1998-06-10 Air Liquide Bleichen von wiederverwendetem zellstoff mittels ozone und wasserstoffperoxyd
US5733412A (en) * 1995-09-13 1998-03-31 International Paper Company Decolorizing brown fibers in recycled pulp
US6428653B1 (en) 2000-12-04 2002-08-06 West Fraser Timber Co. Ltd. Method of bleaching with formamidine sulfinic acid using a reducing agent to eliminate residual peroxide
CA2821954C (fr) * 2010-12-22 2019-02-26 Akzo Nobel Chemicals International B.V. Procede pour ameliorer le blanchiment par le dioxyde de chlore de la pate a papier

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4244780A (en) * 1979-11-15 1981-01-13 Nalco Chemical Company Use of thiourea dioxide in pulp bleaching processes to preserve pulp strength and aid in brightness

Family Cites Families (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE633420A (fr) * 1962-07-16
US3177111A (en) * 1962-12-06 1965-04-06 Weyerhaeuser Co Hypochlorite sulfamic acid process of bleaching cellulosic materials
US3308012A (en) * 1963-08-19 1967-03-07 Du Pont Use of sulfamic acid in chlorination step of multistage bleaching process
FR1601408A (fr) * 1967-06-20 1970-08-24
SE355614B (fr) * 1970-05-13 1973-04-30 Mo Och Domsjoe Ab
US3720577A (en) * 1970-05-25 1973-03-13 Int Paper Co Chlorine dioxide-peracetic acid-chlorine dioxide pulp bleaching sequence
SE393138B (sv) * 1974-03-14 1977-05-02 Mo Och Domsjoe Ab Forfarande for blekning av cellulosa med en syre innehallande gas i nervaro av natriumbikarbonat
JPS5455607A (en) * 1977-10-03 1979-05-02 Kogyo Gijutsuin Bleaching of pulp by liquid phase ozone
US4372812A (en) * 1978-04-07 1983-02-08 International Paper Company Chlorine free process for bleaching lignocellulosic pulp
SU821617A1 (ru) * 1979-05-21 1981-04-15 Всесоюзное Научно-Производственноеобъединение Целлюлозно-Бумажной Про-Мышленности Способ отбелки целлюлозы
FR2457339A1 (fr) * 1979-05-25 1980-12-19 Interox Procede pour la delignification et le blanchiment de pates cellulosiques chimiques et semi-chimiques
SE434284B (sv) * 1980-05-07 1984-07-16 Mo Och Domsjoe Ab Forfarande vid syrgasdelignifiering av kemiskt uppsluten cellulosamassa varvid aromatiska diaminer tillfores
SU903429A1 (ru) * 1980-06-05 1982-02-07 Центральный научно-исследовательский институт бумаги Способ отбелки древесной массы
US4298428A (en) * 1980-08-07 1981-11-03 Nalco Chemical Company Use of additives in pulp bleaching processes to preserve pulp strength
DE3308298A1 (de) * 1983-03-09 1984-09-13 Basf Ag, 6700 Ludwigshafen Verfahren zur reduktiven bleiche von holzstoff
US4484980A (en) * 1983-09-30 1984-11-27 Melamine Chemicals, Inc. Process for bleaching paper pulp using caffeine or guanine as a viscosity stabilizers
US4526651A (en) * 1983-09-30 1985-07-02 Melamine Chemicals, Inc. Process for oxygen bleaching paper pulp using melamine as a viscosity stabilizer
US4487656A (en) * 1983-09-30 1984-12-11 Melamine Chemicals, Inc. Process for bleaching paper pulp using melamine as a viscosity stabilizer
DE3428352A1 (de) * 1984-08-01 1986-02-13 Degussa Ag, 6000 Frankfurt Verfahren zur delignifizierung und bleiche von zellstoffen
US4740212A (en) * 1985-11-25 1988-04-26 Quantum Technologies, Inc. Process and composition for bleaching cellulosic material with hypochlorous acid

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4244780A (en) * 1979-11-15 1981-01-13 Nalco Chemical Company Use of thiourea dioxide in pulp bleaching processes to preserve pulp strength and aid in brightness

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ABSTRACT BULLETIN OF THE INSTITUTE OF PAPER CHEMISTRY, Band 48, Nr. 7, Januar 1978, Seite 738, Zusammenfassung Nr. 7241; H. KAMISHIMA et al.: "Effect of cellulose protectors on ozone bleaching of kraft pulp", & JAPAN TAPPI 31, no. 9: 664-672 (Sept. 1977) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022103081A1 (de) 2022-02-09 2023-08-10 Jan Reijnvaan Paletten
DE102022103082A1 (de) 2022-02-09 2023-08-10 Jan Reijnvaan Palettenblöcke und Paletten

Also Published As

Publication number Publication date
DE3923728A1 (de) 1991-01-24
CA2021392A1 (fr) 1991-01-19
FI903433A0 (fi) 1990-07-06
BR9003292A (pt) 1991-08-27
US5073301A (en) 1991-12-17

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