EP0141138A1 - Verfahren zur Behandlung von Zellulosematerialien mit oxydativen Mitteln - Google Patents

Verfahren zur Behandlung von Zellulosematerialien mit oxydativen Mitteln Download PDF

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Publication number
EP0141138A1
EP0141138A1 EP84110378A EP84110378A EP0141138A1 EP 0141138 A1 EP0141138 A1 EP 0141138A1 EP 84110378 A EP84110378 A EP 84110378A EP 84110378 A EP84110378 A EP 84110378A EP 0141138 A1 EP0141138 A1 EP 0141138A1
Authority
EP
European Patent Office
Prior art keywords
cellulosic materials
process according
treatment
oxidizing agent
chosen
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
EP84110378A
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English (en)
French (fr)
Other versions
EP0141138B1 (de
Inventor
Jacques Hageman
Lucien Plumet
Marcel Robberechts
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.)
Solvay Chimie SA
Original Assignee
Interox 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 Interox SA filed Critical Interox SA
Priority to AT84110378T priority Critical patent/ATE31753T1/de
Publication of EP0141138A1 publication Critical patent/EP0141138A1/de
Application granted granted Critical
Publication of EP0141138B1 publication Critical patent/EP0141138B1/de
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
    • D21C9/1015—Bleaching ; Apparatus therefor with use of means other than pressure, temperature
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M10/00—Physical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. ultrasonic, corona discharge, irradiation, electric currents, or magnetic fields; Physical treatment combined with treatment with chemical compounds or elements
    • D06M10/003—Treatment with radio-waves or microwaves
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M10/00—Physical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. ultrasonic, corona discharge, irradiation, electric currents, or magnetic fields; Physical treatment combined with treatment with chemical compounds or elements
    • D06M10/04—Physical treatment combined with treatment with chemical compounds or elements
    • D06M10/06—Inorganic compounds or elements
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
    • D06M2101/02—Natural fibres, other than mineral fibres
    • D06M2101/04—Vegetal fibres
    • D06M2101/06—Vegetal fibres cellulosic

Definitions

  • the present invention relates to a process for the treatment of cellulosic materials and more particularly to paper pulps, wood chips and cellulosic textile fibers with oxidizing agents.
  • Cellulosic materials intended for the manufacture of paper pulps are subjected to a large number of treatments, some of which are carried out in the presence of oxidizing agents, in particular with a view to improving their whiteness or reducing their lignin content.
  • the methods known to date do not however make it possible to obtain very high whiteness gains or very extensive delignification in a single treatment. Consequently, sequential treatments are frequently used, which generally include a very large number of stages. In addition, the duration of each particular stage is often very long.
  • the cellulosic fibers intended for textile applications are also subjected to certain treatments which may be carried out in the presence of oxidizing agents such as bleaching, scouring to remove impurities, mercerizing to improve the appearance and solidity thereof. and reduce the tendency to shrink or spray to impregnate them with reagents before maturation. All of these techniques require fairly long treatment times.
  • the present invention aims to provide a method for the treatment of cellulosic materials with oxidizing agents which makes it possible to increase the efficiency of the oxidizing agent and in particular to improve the whiteness of the finished product.
  • the method according to the invention also makes it possible to substantially reduce the duration of treatment with the oxidizing agent.
  • the process according to the invention also makes it possible to use significantly less solvent than the known processes, which simplifies subsequent drying steps and reduces effluent discharge and solvent consumption.
  • the method according to the invention makes it possible to reduce, or even eliminate, any mechanical agitation in the treatments which required it. This is particularly the case when processing textile fibers and the manufactured products derived therefrom. It is thus possible to avoid the harmful effects of mechanical agitation on fragile textiles such as jerseys, tulle, etc.
  • the present invention relates to a process for the treatment of cellulosic materials with oxidizing agents according to which the cellulosic materials are subjected to the joint action of microwaves and at least one oxidizing agent.
  • Microwaves are electromagnetic waves that have a wavelength of about 0.1 to about 100 cm, or a frequency of about 300,000 to about 300 MHz. Good results have been obtained with microwaves with a frequency of 100,000 to 500 MHz.
  • oxidizing agents can be used. In general, they are chosen from peroxidized compounds, oxygen, ozone, permanganate as well as compounds capable of releasing active chlorine such as molecular chlorine, chlorine dioxide, hypochlorous acid, hypochlorites, chlorites and organic substances capable of releasing active chlorine. Peroxidized compounds and compounds capable of releasing active chlorine are well suited. Good results have been obtained with peroxidized compounds.
  • the peroxidized compounds can be chosen from hydrogen peroxide, metal peroxides and more particularly alkali or alkaline earth metal peroxides such as sodium peroxide, inorganic persalts such as perborates, percarbonates and persulfates, inorganic peracids such as persulfuric acid, organic peracids and more particularly those containing from 2 to 7 carbon atoms such as peracetic and perpropionic acids as well as their salts and organic hydroperoxides and peroxides.
  • Good results have been obtained with hydrogen peroxide, sodium peroxide, persulfuric acid, persulfates such as sodium persulfate, peracetic acid and peracetates such as sodium peracetate.
  • One or more oxidizing agents of the same types or of different types can be used.
  • oxidizing agents can vary within very wide limits. In general, they are used in doses of 0.001 to 10% of the weight of dry cellulosic materials (M.S.) and most often of 0.1 to 5% of the weight of dry cellulosic materials. In the case of peroxide compounds, use is generally made of 0.1 to 3% of peroxide compounds calculated as hydrogen peroxide equivalents relative to the weight of dry cellulosic materials.
  • oxygen the partial pressure of oxygen is generally at least 100 kPa and more often than not at least 300 kPa. In general, the pressure does not exceed 20,000 kPa and in general not more than 10,000 kPa. In the case of compounds capable of releasing active chlorine, these are used in doses of 0.1 to 8% of the weight of dry cellulosic materials.
  • cellulosic materials can be treated according to the method of the invention.
  • these are cellulosic materials containing at least 30 and most often at least 50% by weight of compounds chosen from polysaccharides and their derivatives. These include celluloses and hemicelluloses as well as their derivatives obtained by various chemical treatments such as the acetate process, the viscose process, the ammoniacal copper process, etc. It is thus possible to apply the method according to the invention to the treatment of paper pulps of all types such as mechanical, thermomechanical, semi-chemical, chemical and mechanochemical pulps as well as to recovery pulps, at any stage of their manufacture, including the stages of pulping, bleaching and treatments prior to the manufacture of the sheet of paper or cardboard.
  • wood can also be applied to wood, or to all wood particles such as wood chips.
  • the process is thus suitable for treating wood as well as wood chips or other wood particles intended to be used for the manufacture of paper pulps such as mechanical, thermomechanical or mechanochemical pastes. It can also be applied to the treatment of cellulosic materials other than wood intended for the manufacture of paper pulps such as straw, reeds, bagasse and bamboo.
  • the cellulosic materials according to the invention can also be chosen from natural cellulosic textile fibers such as linen, cotton, hemp, ramie, jute and sisal and artificial textile fibers such as rayon, viscose rayon, cuproammoniac rayon and cellulose acetate as well as manufactured textiles.
  • natural cellulosic textile fibers such as linen, cotton, hemp, ramie, jute and sisal and artificial textile fibers such as rayon, viscose rayon, cuproammoniac rayon and cellulose acetate as well as manufactured textiles.
  • the method according to the invention is particularly suitable for the treatment of paper pulps and more especially for the treatment of chemical pulps such as sulphate, sulphite or bisulphite pulp. It is also well suited for the treatment of wood particles and more particularly wood chips, in particular for their pretreatment before a mechanical pulping process. Good results have been obtained in the treatment of possibly semi-bleached sulphate doughs.
  • the process according to the invention is generally carried out in the presence of a solvent.
  • the solvent is most often water.
  • the amount of solvent at the start of the treatment according to the invention can vary within wide limits. It is most often at least 0.1% and generally does not exceed 99.5% of the total weight of the mixture subjected to the action of microwaves and which essentially comprises cellulosic materials, solvent, oxidizing agents and any additives.
  • the solvent is water
  • the amount of water at the start of the treatment according to the invention is generally at least 0.5% and most often at least 1% of the total weight of the mixture; it generally does not exceed 95% most often not 90%, and preferably not 85% of the total weight of the mixture.
  • the density at the start of the treatment according to the invention is generally at least 5% and most often at least 8%. It generally does not exceed 99% and more often than not 98%.
  • the density which we are talking about here, expresses the consistency or dryness of the paper pulp and is measured in%, ie g dry pulp / 100 g mixture pulp + water + reagents).
  • the process according to the invention can be carried out in the presence of other additives.
  • the oxidizing agent is not itself capable of imparting the proper pH to the mixture
  • compounds with an alkaline character that is to say capable of imparting a pH equal to or greater than 7 or compounds with an acidic character, that is to say capable of imparting a pH of less than 7 to water or alternatively pH regulators such as buffers.
  • the alkaline compounds can be hydroxides or carbonates of alkali metals or ammonium, and more particularly sodium hydroxide, or sodium silicate.
  • the alkali metal or ammonium bicarbonates can be chosen as pH regulators.
  • Sulfuric acid can be chosen as an acidic compound.
  • the process according to the invention is generally carried out in the presence of a compound of alkaline character.
  • the dose of compound with an alkaline character is generally 0.1 to 20% of the weight of dry cellulosic materials.
  • the pH is generally equal to or greater than 7, more particularly from 7 to 13 and most often from 8 to 12.
  • oxidizing agent when the latter is likely to deactivate during the treatment. This is particularly the case when the oxidizing agent is a peroxide compound. In general, they are used in amounts of 0.01 to 5% of the weight of dry cellulosic materials.
  • additives can also be used depending on the particular applications.
  • sequestering agents surfactants, agents capable of protecting the cellulosic chains to prevent their depolymerization, wetting agents, activating agents, agents anticorrosion agents, antistatic agents, desizing agents, optical brighteners, dispersing agents, anti-scaling agents, foaming agents and collecting agents.
  • surfactants agents capable of protecting the cellulosic chains to prevent their depolymerization
  • wetting agents wetting agents
  • activating agents agents anticorrosion agents
  • antistatic agents desizing agents
  • optical brighteners optical brighteners
  • dispersing agents anti-scaling agents
  • foaming agents and collecting agents are generally used in doses of 0.01 to 10% of the weight of dry cellulosic materials.
  • the cellulosic materials subjected to the treatment according to the invention can have, before this treatment, very diverse temperatures. They can thus have, before the treatment according to the invention, temperatures ranging from ambient temperature, that is to say approximately 10 to 25 ° C., up to temperatures of 200 ° C.
  • the temperature of the cellulosic materials before the treatment according to the invention depends on the existence or not of a previous treatment. Most often the temperature of the cellulosic materials before the treatment according to the invention is the ambient temperature or that which they have acquired during the possible previous treatment. In most cases, the temperature of the cellulosic materials before the treatment according to the invention is from 10 to 90 ° C.
  • the duration of the treatment according to the invention is variable. In general, it is 0.1 to 120 minutes and most often 0.2 to 30 minutes. It is generally shorter than that of the corresponding treatments using oxidizing agents without the intervention of microwaves.
  • the process according to the invention can be carried out continuously or batchwise.
  • the method according to the invention can be implemented in various industries and in particular in the paper industry and in the textile industry.
  • wood particles such as shavings by means of oxidizing agents such as peroxidized compounds, before their pulping in devices such as refiners.
  • This operation can be done at the same time as or after the "presteaming".
  • the process according to the invention can also take place after passing through a refiner or between two passing through refiners.
  • the method according to the invention is also well suited for bleaching paper pulps of all types already formed. It can thus be applied at various stages of bleaching consecutive to pulping or cooking. It is particularly suitable for the treatment of unbleached pasta, especially the alkaline pasta collected after washing after cooking, mainly in the case of chemical pasta such as kraft pasta, or for the treatment of pasta before entering the towers. extraction. It is also well suited for bleaching semi-bleached pasta.
  • the method according to the invention is well suited for the treatment of pressed or dried pasta.
  • the pasta can be pressed or dried by means of various devices suitable for these uses and known by themselves. It is thus possible to use cylinder, screw or belt presses or conventional dryers or "flash-dryers". Pasta can come in various forms such as leaves or "flocks”.
  • the method according to the invention can also be applied to the various treatments with oxidizing agents to which the cellulosic textile fibers are subjected. This is the case with scalding, mercerizing, bleaching and impregnation such as spraying before maturation. These impregnations can be done in various devices known by themselves operating either continuously such as “pad-steam”, “J-box” and “U-box” and continuous pressurized vaporizers, or in semi- continuous such as "pad-roll”, or finally discontinuous such as turnstile boats, autoclaves, turners, "jiggers" and “kier”.
  • the method according to the invention is well suited for the pretreatment of the fibers before they are sent to one or other of the abovementioned treatments.
  • Example 2R was carried out for comparison.
  • a semi-bleached softwood kraft pulp according to the CEH sequence of initial whiteness 63.6 ° ISO (standard ISO 2470) was used.
  • the dough was previously "fluffed” (reduced to fluff) in a household mixer.
  • the dry paste is introduced into a polyethylene bag where it is moistened by spraying with an aqueous solution of hydrogen peroxide. It is then exposed to a microwave beam of a frequency of around 2.450 MHz in a household microwave oven TOSHIBA brand ER-649 ET-S with turntable set to "DEFROST" position for five minutes (test 1) or in an oven maintained at 100 ° C for five minutes (test 2R).
  • the whiteness of the dough was measured relative to the whiteness of B A SO 4 measured by means of an ELREPHO reflectometer (ZEISS) equipped with the R457 filter and a gloss trap (ISO 2470 standard).
  • ZEISS ELREPHO reflectometer equipped with the R457 filter and a gloss trap (ISO 2470 standard).
  • the consumption of hydrogen peroxide was measured by assaying the residual hydrogen peroxide in the presence of paste.
  • test 3 Three tests were carried out at different acid (tests 3 and 4) and basic (test 5) pH under conditions close to those of Example 1.
  • the dough is then wrung, "fluffed” and dried in a ventilated oven at 40 ° C.
  • the dry paste is then subjected to the same treatment as in Example 1.
  • Example 1 The same semi-bleached kraft pulp as that used for the production of Examples 1 and 2R was treated with hydrogen peroxide under the same conditions as in Example 1 (test 6) and in Example 2R (test 7R) except, however, the density which has been adjusted to 15%.
  • test 8 and 10 were carried out under the same conditions as test 6, tests 9R and 11R, under the same conditions as test 7R.
  • test 12 was carried out under the same conditions as test 6, test 13R under the same conditions as test 7R.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Cephalosporin Compounds (AREA)
  • Detergent Compositions (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
EP84110378A 1983-09-16 1984-08-31 Verfahren zur Behandlung von Zellulosematerialien mit oxydativen Mitteln Expired EP0141138B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84110378T ATE31753T1 (de) 1983-09-16 1984-08-31 Verfahren zur behandlung von zellulosematerialien mit oxydativen mitteln.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8314900A FR2552125B1 (fr) 1983-09-16 1983-09-16 Procede pour le taitement des matieres cellulosiques par des agents oxydants
FR8314900 1983-09-16

Publications (2)

Publication Number Publication Date
EP0141138A1 true EP0141138A1 (de) 1985-05-15
EP0141138B1 EP0141138B1 (de) 1988-01-07

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EP84110378A Expired EP0141138B1 (de) 1983-09-16 1984-08-31 Verfahren zur Behandlung von Zellulosematerialien mit oxydativen Mitteln

Country Status (15)

Country Link
US (1) US4576609A (de)
EP (1) EP0141138B1 (de)
JP (1) JPS6088191A (de)
AT (1) ATE31753T1 (de)
AU (1) AU560277B2 (de)
BR (1) BR8404609A (de)
CA (1) CA1228452A (de)
DE (1) DE3468454D1 (de)
ES (1) ES8603602A1 (de)
FI (1) FI71963C (de)
FR (1) FR2552125B1 (de)
IN (1) IN161416B (de)
NO (1) NO164789C (de)
NZ (1) NZ209471A (de)
PT (1) PT79157B (de)

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GB2265392A (en) * 1992-03-24 1993-09-29 Albright & Wilson Stabilization of peroxide bleach liquors
US5512060A (en) * 1991-08-27 1996-04-30 Sandoz Ltd. Process for treating textile materials with enzyme containing compositions and high frequency fields
EP2213678A1 (de) * 2007-10-17 2010-08-04 Nippon Steel Chemical Co., Ltd. Herstellungsverfahren für gelöstes lignin, saccharidausgangsstoff und monosaccharidausgangsstoff sowie gelöstes lignin
EP2415810A3 (de) * 2006-10-26 2012-10-31 Xyleco, Inc. Verfahren zur Herstellung von Zuckern aus Biomasse
IT201800007870A1 (it) * 2018-08-06 2018-11-06 Universita' Degli Studi Di Milano Procedimento per la produzione di nanocristalli di cellulosa (cnc)

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US5196069A (en) * 1991-07-05 1993-03-23 The United States Of America As Represented By The United States National Aeronautics And Space Administration Apparatus and method for cellulose processing using microwave pretreatment
DE69421254T2 (de) * 1993-12-22 2000-04-20 Canon Kk Verfahren zum Abbau einer Organochlorverbindung und zur Umweltsanierung mittels Mikroorganismen
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US6287346B1 (en) * 1996-07-24 2001-09-11 The Procter & Gamble Company Method for stain removal on fabric with detergent compositions containing bleach
NZ504351A (en) 1997-11-14 2002-10-25 Akzo Nobel Nv Contraceptive kit comprising progestogen and anti-progestogen and use in treating bleeding induced by a progestogen-only contraceptive regimen
WO1999025802A1 (en) * 1997-11-14 1999-05-27 The Procter & Gamble Company Method for cleaning using microwaves and a bleaching composition
DE19938502A1 (de) * 1999-08-13 2001-02-15 Wolff Walsrode Ag Verfahren zur Herstellung von Cellulosederivaten
US20040104003A1 (en) * 2000-11-28 2004-06-03 Biopulping International, Inc. Eucalyptus biokraft pulping process
US7008505B2 (en) * 2001-06-01 2006-03-07 Biopulping International, Inc. Eucalyptus biomechanical pulping process
EP1448846A4 (de) * 2001-11-09 2006-06-21 Biopulping Int Inc Mikrowellenvorbehandlung von baumstämmen zur herstellung von papier und holzwerkstoffen
EP1786352A4 (de) 2004-08-24 2009-03-25 Millennium Dental Internationa Permanganat enthaltende bleichzusammensetzungen und anwendungsverfahren
US7914646B2 (en) * 2006-07-21 2011-03-29 Nalco Company Compositions and processes for paper production
FI20051145A0 (fi) * 2005-11-11 2005-11-11 Kemira Oyj Uusi massa ja menetelmä massan valmistamiseksi
US7967948B2 (en) * 2006-06-02 2011-06-28 International Paper Company Process for non-chlorine oxidative bleaching of mechanical pulp in the presence of optical brightening agents
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US7815876B2 (en) 2006-11-03 2010-10-19 Olson David A Reactor pump for catalyzed hydrolytic splitting of cellulose
US7815741B2 (en) * 2006-11-03 2010-10-19 Olson David A Reactor pump for catalyzed hydrolytic splitting of cellulose
JP5145491B2 (ja) * 2007-03-26 2013-02-20 独立行政法人産業技術総合研究所 天然繊維の光改質方法および装置
US7867358B2 (en) * 2008-04-30 2011-01-11 Xyleco, Inc. Paper products and methods and systems for manufacturing such products
US7867359B2 (en) 2008-04-30 2011-01-11 Xyleco, Inc. Functionalizing cellulosic and lignocellulosic materials
KR101603362B1 (ko) * 2008-07-28 2016-03-14 교또 다이가꾸 마이크로파 조사 장치, 연결형 마이크로파 조사 장치, 및 식물 재료로부터 당 성분을 제조하는 방법
WO2012166997A2 (en) 2011-05-31 2012-12-06 Clean Chemistry, Llc Electrochemical reactor and process
GB201109639D0 (en) * 2011-06-09 2011-07-20 Biofuels Wales Ltd Fuels from biomass
WO2014039929A1 (en) 2012-09-07 2014-03-13 Clean Chemistry, Llc Systems and methods for generation of reactive oxygen species and applications thereof
CA2960104C (en) 2014-09-04 2023-05-02 Clean Chemistry, Inc. Method of water treatment utilizing a peracetate oxidant solution
WO2016154531A1 (en) 2015-03-26 2016-09-29 Clean Chemistry, Inc. Systems and methods of reducing a bacteria population in high hydrogen sulfide water
US10883224B2 (en) 2015-12-07 2021-01-05 Clean Chemistry, Inc. Methods of pulp fiber treatment
WO2017100284A1 (en) 2015-12-07 2017-06-15 Clean Chemistry, Inc. Methods of microbial control
US11136714B2 (en) 2016-07-25 2021-10-05 Clean Chemistry, Inc. Methods of optical brightening agent removal
US11001864B1 (en) 2017-09-07 2021-05-11 Clean Chemistry, Inc. Bacterial control in fermentation systems
US11311012B1 (en) 2017-09-07 2022-04-26 Clean Chemistry, Inc. Bacterial control in fermentation systems

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GB796932A (en) * 1955-02-08 1958-06-25 Zellstoffverfahrens A G Improved method of producing highly hydrated fibres and structures manufactured therefrom
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Publication number Priority date Publication date Assignee Title
DE815602C (de) * 1949-02-01 1951-10-04 Georges Ulrici Verfahren zur Behandlung von zellulosehaltigen Stoffen durch Ultraschallwellen, insbesondere zur Herstellung von Papiermasse
GB796932A (en) * 1955-02-08 1958-06-25 Zellstoffverfahrens A G Improved method of producing highly hydrated fibres and structures manufactured therefrom
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Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5512060A (en) * 1991-08-27 1996-04-30 Sandoz Ltd. Process for treating textile materials with enzyme containing compositions and high frequency fields
GB2265392A (en) * 1992-03-24 1993-09-29 Albright & Wilson Stabilization of peroxide bleach liquors
GB2265392B (en) * 1992-03-24 1995-08-30 Albright & Wilson Stabilization of peroxide bleach liquors by chlorine dioxide
US5618385A (en) * 1992-03-24 1997-04-08 Albright & Wilson Limited Method of peroxide bleaching of pulp using a peroxide decomposing inactivator
US9023628B2 (en) 2006-10-26 2015-05-05 Xyleco, Inc. Processing biomass
US8852905B2 (en) 2006-10-26 2014-10-07 Xyleco, Inc. Processing biomass
EP2415810A3 (de) * 2006-10-26 2012-10-31 Xyleco, Inc. Verfahren zur Herstellung von Zuckern aus Biomasse
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CA1228452A (fr) 1987-10-27
FI843468A (fi) 1985-03-17
EP0141138B1 (de) 1988-01-07
NO843644L (no) 1985-03-18
FI71963B (fi) 1986-11-28
US4576609A (en) 1986-03-18
FI843468A0 (fi) 1984-09-05
FI71963C (fi) 1987-03-09
FR2552125A1 (fr) 1985-03-22
ES535928A0 (es) 1985-12-16
BR8404609A (pt) 1985-08-06
PT79157B (en) 1986-11-18
AU560277B2 (en) 1987-04-02
ATE31753T1 (de) 1988-01-15
NO164789C (no) 1990-11-14
FR2552125B1 (fr) 1986-03-21
PT79157A (en) 1984-09-01
JPS6088191A (ja) 1985-05-17
ES8603602A1 (es) 1985-12-16
NO164789B (no) 1990-08-06
NZ209471A (en) 1987-02-20
DE3468454D1 (en) 1988-02-11
IN161416B (de) 1987-11-28
AU3273784A (en) 1985-03-21

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