EP0141138B1 - Procédé pour le traitement des matières cellulosiques par des agents oxydants - Google Patents
Procédé pour le traitement des matières cellulosiques par des agents oxydants Download PDFInfo
- Publication number
- EP0141138B1 EP0141138B1 EP84110378A EP84110378A EP0141138B1 EP 0141138 B1 EP0141138 B1 EP 0141138B1 EP 84110378 A EP84110378 A EP 84110378A EP 84110378 A EP84110378 A EP 84110378A EP 0141138 B1 EP0141138 B1 EP 0141138B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- process according
- oxidizing agent
- treatment
- cellulosic materials
- compounds
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 40
- 239000000463 material Substances 0.000 title claims abstract description 30
- 239000007800 oxidant agent Substances 0.000 title claims abstract description 29
- 238000011282 treatment Methods 0.000 title claims description 44
- 239000002023 wood Substances 0.000 claims abstract description 13
- 239000004753 textile Substances 0.000 claims abstract description 12
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 22
- 150000001875 compounds Chemical class 0.000 claims description 19
- 229920001131 Pulp (paper) Polymers 0.000 claims description 13
- -1 compounds peroxides Chemical class 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000000835 fiber Substances 0.000 claims description 8
- 229920002678 cellulose Polymers 0.000 claims description 7
- 239000001913 cellulose Substances 0.000 claims description 7
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 6
- 239000000654 additive Substances 0.000 claims description 6
- 239000000460 chlorine Substances 0.000 claims description 6
- 229910052801 chlorine Inorganic materials 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- KFSLWBXXFJQRDL-UHFFFAOYSA-N Peracetic acid Chemical compound CC(=O)OO KFSLWBXXFJQRDL-UHFFFAOYSA-N 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 150000004968 peroxymonosulfuric acids Chemical class 0.000 claims description 3
- PFUVRDFDKPNGAV-UHFFFAOYSA-N sodium peroxide Chemical compound [Na+].[Na+].[O-][O-] PFUVRDFDKPNGAV-UHFFFAOYSA-N 0.000 claims description 3
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 claims description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 2
- 150000002978 peroxides Chemical class 0.000 claims description 2
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 claims description 2
- SPDUKHLMYVCLOA-UHFFFAOYSA-M sodium;ethaneperoxoate Chemical compound [Na+].CC(=O)O[O-] SPDUKHLMYVCLOA-UHFFFAOYSA-M 0.000 claims description 2
- 230000002301 combined effect Effects 0.000 claims 1
- 239000007795 chemical reaction product Substances 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 8
- 235000015927 pasta Nutrition 0.000 description 8
- 238000004061 bleaching Methods 0.000 description 7
- 239000002904 solvent Substances 0.000 description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- 229920000297 Rayon Polymers 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000004537 pulping Methods 0.000 description 4
- 239000002655 kraft paper Substances 0.000 description 3
- 239000004155 Chlorine dioxide Substances 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 238000013019 agitation Methods 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 150000001340 alkali metals Chemical class 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 235000019398 chlorine dioxide Nutrition 0.000 description 2
- 238000010411 cooking Methods 0.000 description 2
- 238000005470 impregnation Methods 0.000 description 2
- 230000035800 maturation Effects 0.000 description 2
- JRKICGRDRMAZLK-UHFFFAOYSA-L persulfate group Chemical group S(=O)(=O)([O-])OOS(=O)(=O)[O-] JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 2
- 239000002964 rayon Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 229910021653 sulphate ion Inorganic materials 0.000 description 2
- 230000000930 thermomechanical effect Effects 0.000 description 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 1
- 244000198134 Agave sisalana Species 0.000 description 1
- 241000609240 Ambelania acida Species 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical class [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 1
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
- 240000008564 Boehmeria nivea Species 0.000 description 1
- 244000025254 Cannabis sativa Species 0.000 description 1
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 1
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 1
- 229920003043 Cellulose fiber Polymers 0.000 description 1
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 240000000491 Corchorus aestuans Species 0.000 description 1
- 235000011777 Corchorus aestuans Nutrition 0.000 description 1
- 235000010862 Corchorus capsularis Nutrition 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 241000219146 Gossypium Species 0.000 description 1
- 229920002488 Hemicellulose Polymers 0.000 description 1
- 244000273256 Phragmites communis Species 0.000 description 1
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- 244000082204 Phyllostachys viridis Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 241001584775 Tunga penetrans Species 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 150000004973 alkali metal peroxides Chemical class 0.000 description 1
- 150000004974 alkaline earth metal peroxides Chemical class 0.000 description 1
- 235000012538 ammonium bicarbonate Nutrition 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 239000010905 bagasse Substances 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 239000000872 buffer Substances 0.000 description 1
- 235000009120 camo Nutrition 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 239000011111 cardboard Substances 0.000 description 1
- 229920002301 cellulose acetate Polymers 0.000 description 1
- 235000005607 chanvre indien Nutrition 0.000 description 1
- QBWCMBCROVPCKQ-UHFFFAOYSA-N chlorous acid Chemical class OCl=O QBWCMBCROVPCKQ-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000009990 desizing Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 235000015432 dried pasta Nutrition 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 244000144992 flock Species 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 150000004676 glycans Chemical class 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 239000011487 hemp Substances 0.000 description 1
- 150000002432 hydroperoxides Chemical class 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical class Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 1
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 150000004966 inorganic peroxy acids Chemical class 0.000 description 1
- 230000009916 joint effect Effects 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 150000004972 metal peroxides Chemical class 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 150000004967 organic peroxy acids Chemical class 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001282 polysaccharide Polymers 0.000 description 1
- 239000005017 polysaccharide Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 239000003352 sequestering agent Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 239000011122 softwood Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
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 pulp 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. We therefore frequently use sequential treatments which generally include a very large number of stages. In addition, the duration of each particular stage is often very long.
- the cellulose fibers intended for textile applications are also subjected to certain treatments which can be carried out in the presence of oxidizing agents such as bleaching, scouring to remove the impurities, mercerizing to improve the appearance and the 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 process 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 significantly reduce the duration of the treatment with the oxidizing agent.
- the method according to the invention also makes it possible to use significantly less solvent than the known methods, which simplifies the subsequent drying steps and reduces the effluent discharges and the consumption of solvent.
- 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. One can thus 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 from about 0.1 to about 100 cm, or a frequency from about 300,000 MHz to about 300 MHz. Good results have been obtained with microwaves with a frequency of 100,000 MHz 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 the peroxidized compounds.
- the peroxide 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, generally 0.1 to 3% of peroxide compounds calculated in hydrogen peroxide equivalents relative to the weight of dry cellulosic materials are used.
- 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 cellulose 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.
- the method is thus suitable for the treatment of 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 pulps. 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 does not generally exceed 99% and most often 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 to the water 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 alkali 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, 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 anticorrosion agents
- antistatic agents desizing agents
- optical brighteners optical brighteners
- dispersing agents anti-scaling agents
- foaming agents and collecting agents are generally coated at 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 cellularosic 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.
- 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 semi-continuous such as "pad-roll”, or finally discontinuously such as turnstile boats, autoclaves, spinners, "Jigger” 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 approximately 2450 MHz in a household microwave oven of TOSHIBA brand ER-649 ET-S with rotary table set in the "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 BaS0 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 11 R, 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.
Landscapes
- 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)
- Dry Formation Of Fiberboard And The Like (AREA)
- Detergent Compositions (AREA)
- Cephalosporin Compounds (AREA)
- Treatments Of Macromolecular Shaped Articles (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
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 EP0141138A1 (fr) | 1985-05-15 |
EP0141138B1 true EP0141138B1 (fr) | 1988-01-07 |
Family
ID=9292345
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84110378A Expired EP0141138B1 (fr) | 1983-09-16 | 1984-08-31 | Procédé pour le traitement des matières cellulosiques par des agents oxydants |
Country Status (15)
Country | Link |
---|---|
US (1) | US4576609A (ko) |
EP (1) | EP0141138B1 (ko) |
JP (1) | JPS6088191A (ko) |
AT (1) | ATE31753T1 (ko) |
AU (1) | AU560277B2 (ko) |
BR (1) | BR8404609A (ko) |
CA (1) | CA1228452A (ko) |
DE (1) | DE3468454D1 (ko) |
ES (1) | ES535928A0 (ko) |
FI (1) | FI71963C (ko) |
FR (1) | FR2552125B1 (ko) |
IN (1) | IN161416B (ko) |
NO (1) | NO164789C (ko) |
NZ (1) | NZ209471A (ko) |
PT (1) | PT79157B (ko) |
Cited By (2)
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DE4128256C1 (ko) * | 1991-08-27 | 1993-04-15 | H. Krantz Gmbh & Co, 5100 Aachen, De | |
US9347661B2 (en) | 2006-10-26 | 2016-05-24 | Xyleco, Inc. | Processing biomass |
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US4740212A (en) * | 1985-11-25 | 1988-04-26 | Quantum Technologies, Inc. | Process and composition for bleaching cellulosic material with hypochlorous acid |
DE3703049A1 (de) * | 1987-02-03 | 1988-08-11 | Wfk Testgewebe Gmbh | Verfahren zum bleichen sowie vorrichtung zur durchfuehrung des verfahrens |
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 |
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EP0659450B1 (en) * | 1993-12-22 | 1999-10-20 | Canon Kabushiki Kaisha | Process for decomposing a chloroorganic compound and for remedying environment with microorganisms |
US6153300A (en) | 1994-04-18 | 2000-11-28 | Ahlstrom Machinery, Inc. | Bleaching cellulose pulp having cleanliness which varies significantly over time using at least two different bleaching stages and bleaching chemicals |
US6287346B1 (en) * | 1996-07-24 | 2001-09-11 | The Procter & Gamble Company | Method for stain removal on fabric with detergent compositions containing bleach |
CN1281363A (zh) | 1997-11-14 | 2001-01-24 | 阿克佐诺贝尔公司 | 孕激素-抗孕激素体系 |
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 |
WO2003040462A1 (en) * | 2001-11-09 | 2003-05-15 | Biopulping International, Inc. | Microwave pre-treatment of logs for use in making paper and other wood products |
CA2577795C (en) | 2004-08-24 | 2012-10-23 | Millennium Dental International Inc. | Permanganate containing whitening compositions and methods of their use |
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 |
US20080071078A1 (en) * | 2006-09-19 | 2008-03-20 | Kizer Lawton E | Method of making cellulose ester polymer and pre-treating cellulose for the manufacture of cellulose ester polymer |
US7815741B2 (en) * | 2006-11-03 | 2010-10-19 | Olson David A | Reactor pump for catalyzed hydrolytic splitting of cellulose |
US7815876B2 (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 |
CA2701854C (en) * | 2007-10-17 | 2014-07-15 | Nippon Steel Chemical Co., Ltd. | Production methods for solubilized lignin, saccharide raw material and monosaccharide raw material, and solubilized lignin |
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 |
EP2323461B1 (en) | 2008-07-28 | 2018-07-18 | Kyoto University | Microwave irradiation device |
US9551076B2 (en) | 2011-05-31 | 2017-01-24 | Clean Chemistry, Inc. | Electrochemical reactor and process |
GB201109639D0 (en) * | 2011-06-09 | 2011-07-20 | Biofuels Wales Ltd | Fuels from biomass |
US9517955B2 (en) | 2012-09-07 | 2016-12-13 | Clean Chemistry, Llc | System and method for generation of point of use reactive oxygen species |
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US20170159237A1 (en) * | 2015-12-07 | 2017-06-08 | Clean Chemistry | Methods of pulp fiber treatment |
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US11311012B1 (en) | 2017-09-07 | 2022-04-26 | Clean Chemistry, Inc. | Bacterial control in fermentation systems |
IT201800007870A1 (it) * | 2018-08-06 | 2018-11-06 | Universita' Degli Studi Di Milano | Procedimento per la produzione di nanocristalli di cellulosa (cnc) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1011405A (fr) * | 1949-02-01 | 1952-06-23 | Perfectionnements apportés aux procédés pour le traitement de matières cellulo-siques par les ultra-sons, notamment à ceux pour la fabrication de pâtes à papier | |
CH341707A (de) * | 1955-02-08 | 1959-10-15 | Zellstoffverfahrens Ag | Verfahren zur Erhöhung des Quellwertes von Fasern in Suspension |
FR1342601A (fr) * | 1962-12-28 | 1963-11-08 | Application des ultra-sons au finissage des produits textiles artificiels ou synthétiques | |
US3632299A (en) * | 1969-09-19 | 1972-01-04 | Us Agriculture | Shrinkproofing of animal fibers by passing said through an electrical discharge zone containing ozone |
US3695825A (en) * | 1970-03-30 | 1972-10-03 | Magyar Viscosa Gyar | Acoustic method for the posttreatment of fibers |
JPS58219005A (ja) * | 1982-06-15 | 1983-12-20 | 松下電工株式会社 | 処理液の含浸法 |
-
1983
- 1983-09-16 FR FR8314900A patent/FR2552125B1/fr not_active Expired
-
1984
- 1984-08-30 PT PT79157A patent/PT79157B/pt not_active IP Right Cessation
- 1984-08-31 DE DE8484110378T patent/DE3468454D1/de not_active Expired
- 1984-08-31 AT AT84110378T patent/ATE31753T1/de not_active IP Right Cessation
- 1984-08-31 EP EP84110378A patent/EP0141138B1/fr not_active Expired
- 1984-09-05 IN IN697/DEL/84A patent/IN161416B/en unknown
- 1984-09-05 FI FI843468A patent/FI71963C/fi not_active IP Right Cessation
- 1984-09-05 AU AU32737/84A patent/AU560277B2/en not_active Ceased
- 1984-09-06 CA CA000462543A patent/CA1228452A/fr not_active Expired
- 1984-09-06 NZ NZ209471A patent/NZ209471A/en unknown
- 1984-09-13 US US06/650,066 patent/US4576609A/en not_active Expired - Fee Related
- 1984-09-14 JP JP59193814A patent/JPS6088191A/ja active Pending
- 1984-09-14 ES ES535928A patent/ES535928A0/es active Granted
- 1984-09-14 NO NO843644A patent/NO164789C/no unknown
- 1984-09-14 BR BR8404609A patent/BR8404609A/pt not_active IP Right Cessation
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4128256C1 (ko) * | 1991-08-27 | 1993-04-15 | H. Krantz Gmbh & Co, 5100 Aachen, De | |
US9347661B2 (en) | 2006-10-26 | 2016-05-24 | Xyleco, Inc. | Processing biomass |
Also Published As
Publication number | Publication date |
---|---|
FI843468A0 (fi) | 1984-09-05 |
FR2552125B1 (fr) | 1986-03-21 |
BR8404609A (pt) | 1985-08-06 |
CA1228452A (fr) | 1987-10-27 |
FI843468A (fi) | 1985-03-17 |
EP0141138A1 (fr) | 1985-05-15 |
DE3468454D1 (en) | 1988-02-11 |
ES8603602A1 (es) | 1985-12-16 |
FR2552125A1 (fr) | 1985-03-22 |
FI71963C (fi) | 1987-03-09 |
PT79157A (en) | 1984-09-01 |
JPS6088191A (ja) | 1985-05-17 |
ATE31753T1 (de) | 1988-01-15 |
AU3273784A (en) | 1985-03-21 |
US4576609A (en) | 1986-03-18 |
IN161416B (ko) | 1987-11-28 |
NO164789B (no) | 1990-08-06 |
NO164789C (no) | 1990-11-14 |
NZ209471A (en) | 1987-02-20 |
ES535928A0 (es) | 1985-12-16 |
FI71963B (fi) | 1986-11-28 |
PT79157B (en) | 1986-11-18 |
NO843644L (no) | 1985-03-18 |
AU560277B2 (en) | 1987-04-02 |
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