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Patent Searching and Data


Matches 451 - 500 out of 2,219

Document Document Title
WO/2000/051708A1
Polyester water-based defoamers are prepared by reaction of a dimer fatty acid, a fatty acid and two different polyalkylene polyols, e.g. polypropylene glycol and polyethylene glycol. The resulting polyesters are readily dispersible in w...  
WO/2000/050689A1
The present invention relates to a method for producing kraft cellulose that involves preparing a highly-selective polysulphide alkali liquor by oxidising a white alkali liquor in a new heterogeneous catalyst A, B or C. The wood is then ...  
WO/2000/047812A1
The process of the present invention relates to a substantially sulfur free process for the manufacturing of a chemical pulp with an integrated recovery system for recovery of pulping chemicals. The subject process is carried out in seve...  
WO/2000/039390A1
Disclosed is a method for producing kraft wood fiber having an alpha-cellulose content greater than 97 % and a viscosity greater than 40 centipoise. The method involves prehydrolyzing hardwood chips with water, kraft cooking, bleaching a...  
WO/2000/034568A1
The invention relates to a method of obtaining alpha dissolving pulp from wood chips by steam pressure treatment and subsequent removal of the hemicelluloses and the lignin. The inventive method is characterized in that the chips are imp...  
WO2000011260A3
The present invention relates to a method for producing cellulose from a ligno-cellulosic material, wherein said method involves submitting this material to a high-temperature process in a sulfate alkali medium while acting on the alkali...  
WO2000011259A3
This invention relates to a device for producing cellulose which includes the following: a cooking reactor which contains sulfate alkali liquor and a lignocellulose material; a DC source and electrodes in contact with the sulfate alkali ...  
WO/2000/028133A1
A process for the production of pulp using alkaline delignification is disclosed, wherein cellulosic material is initially treated with steam, and a chelating agent is added in connection with the steam treatment. The end pH of the steam...  
WO/2000/025600A1
A method for processing straw pulp that includes caustic treatment is provided. The caustic treated straw pulp can be incorporated into a papermaking furnish to provide a paper product. The caustic treated pulp imparts strength to papers...  
WO/2000/024962A1
The invention concerns a method for repulping paper by contacting an aqueous paper suspension with at least a paracid for a time interval of less than 15 minutes to obtain raw pulp followed by a subsequent treatment to obtain a defibrate...  
WO1999063149A8
Disclosed is a method for delignifying lignocellulosic materials by first treating the material with an alkaline solution in the presence or absence of anthraquinone, and then exposing the material to a polyoxometalate. Inclusion of the ...  
WO/2000/020677A1
The present invention is a soybean hull fiber from which polyphenolics or lignin has been removed, having cellulose and hemicellulose, wherein the improvement is that the cellulose and hemicellulose are dissociated as a delignified soybe...  
WO/2000/019004A1
A process for producing unbleached pulp suitable for the production of bleached paper from a feedstock comprising subjecting the feedstock to a steam explosion process in a reactor at a semi-alkaline pH to produce pulp.  
WO/2000/017444A1
A novel pulping process has been discovered whereby acid is added to the black liquor mixture. The acid renders the lignin insoluble thus enabling it to be separated from the black liquor. The invention obviates the need for a recovery b...  
WO/2000/012436A1
Improved process for inhibiting calcium carbonate scaling in aqueous systems such as that employed in the Kraft pulping process. Such an improved process is achieved by the addition of at least one antiscalant comprising one monomer unit...  
WO/2000/012810A1
A method for preparation of a fibrous stock suitable for manufacture of paper out of herb-stemmed plants, such as, for example, straw or flax. The method comprises steps in which the fibrous raw-material is cut into chips, cooked, and bl...  
WO/2000/011239A1
A method for controlling corrosion of metals, particularly ferrous-based metals in contact with aqueous systems is disclosed, which includes treating industrial waters with a tetrazolium salt of general formula (I) wherein R¿1?, R¿2?, ...  
WO/2000/011261A1
A method for continuous cooking of lignocellulosic fibre material, comprising the steps of sequentially (a) in a first stage, impregnating the fibre material in an impregnation liquid comprising alkali metal hydroxide, and thereafter wit...  
WO/2000/011260A2
The present invention relates to a method for producing cellulose from a ligno-cellulosic material, wherein said method involves submitting this material to a high-temperature process in a sulfate alkali medium while acting on the alkali...  
WO/2000/011263A1
The present invention relates to a method of preventing scale formation in a pulping process of chemical pulp. The method comprises at least the following steps: a) comminuted cellulosic fibrous material is treated with cooking liquor at...  
WO/2000/011259A2
This invention relates to a device for producing cellulose which includes the following: a cooking reactor which contains sulfate alkali liquor and a lignocellulose material; a DC source and electrodes in contact with the sulfate alkali ...  
WO/2000/005310A1
A process and materials are described in which highly refined cellulose fibers are broken down into microfibers and further processed into compositions, films, coatings and solid materials which are biodegradable and even edible. The pro...  
WO/2000/003083A1
The invention relates to a process for enhancing the concentration of the fibre derived dissolved and colloidal substances in process water that comes from mechanical pulping. According to the invention, process water is treated with enz...  
WO/1999/063152A1
Method and improving causticizing efficiency in the conventional lime recausticization portion of alkaline pulping processes, such as are commonly used in the pulping and bleaching of wood and non-wood cellulose fiber materials. An aqueo...  
WO/1999/063149A1
Disclosed is a method for delignifying lignocellulosic materials by first treating the material with an alkaline solution in the presence or absence of anthraquinone, and then exposing the material to a polyoxometalate. Inclusion of the ...  
WO/1999/063151A1
A method is provided for the use of borates in the recausticization of alkali-containing liquors such as those produced in the chemical and semi-chemical pulping of wood and in the oxidation and bleaching of wood pulp. Sodium hydroxide i...  
WO1999045191A9
Chemical cellulose pulp (e.g. kraft pulp) is produced with enhanced strength and/or yield using a strength or yield enhancing additive such as polysulfide or anthraquinone or its equivalents or derivatives, and in a manner that allows ef...  
WO/1999/057364A1
The invention relates to a process based on formic acid cooking for producing pulp from herbaceous plants and deciduous trees by using acetic acid as an additional cooking chemical. The obtained pulp can be used in fine paper and board p...  
WO/1999/047248A1
Methods for controlling wax and other contaminants by improving the dispersion of these materials through the addition of contaminant dispersants to the process of recycling paper and paperboard are disclosed. A preferred contaminant dis...  
WO/1999/047733A1
The present invention provides compositions, useful for making lyocell fibers, having a high hemicellulose content, a low lignin content and including cellulose that has a low average degree of polymerization (D.P.). Further, the present...  
WO/1999/047250A1
The invention relates to a method for the treatment of solids with liquefied gases, especially liquefied ammonia, under pressure. According to said method the solid to be treated is placed into a pressurized reactor (10) at ambient press...  
WO/1999/045191A1
Chemical cellulose pulp (e.g. kraft pulp) is produced with enhanced strength and/or yield using a strength or yield enhancing additive such as polysulfide or anthraquinone or its equivalents or derivatives, and in a manner that allows ef...  
WO/1999/042652A1
The specification discloses a process for production of chemical fibrous pulp for making paper, paperboard and other fibrous products from herbaceous plants, such as kenaf. Pulp from the herbaceous plant is made by a process which involv...  
WO/1999/042651A1
A method for removing wax from a pulp furnish is disclosed. The method is effective for removing wax from a pulp furnish containing waxed old corrugated containers (OCC). In the method, the pulp furnish containing waxed OCC is treated wi...  
WO/1999/041448A1
A process for producing a pulp suitable for papermaking from a nonwood fiber source material is described. Exemplary nonwood fiber source materials include kenaf and industrial hemp. The process includes the steps of washing the nonwood ...  
WO/1999/040252A1
Enhanced removal of lignin and other extractives in a pulping process is achieved by contacting wood chips and the like with a liquid mixture comprised of white liquor and aminoalkoxylsilane and optionally, one or more nonionic and/or an...  
WO/1999/037834A1
A process for the production of elementary vegetable bast fibres is provided, which process comprises the steps of a) cutting raw vegetable bast fibres to a fibre length of 1 to 400 mm, b) chemically treating the cut fibres to remove lig...  
WO/1999/031315A1
A method for separating cellulosic components from, and determining cellulosic component content of, plant material. Plant material and an electromagnetic active solvent, e.g. ethanol, are heated by means of electromagnetic radiation (e....  
WO/1999/022063A1
The invention is related to the technological production of cellulose by cooking raw plant material - wood by the variable parameter of amount of chemical reagent in the liquor. The process of cooking is carned out with B-constant based ...  
WO/1999/020830A1
The invention concerns chemical paper pulp production method which comprises a continuous cooking process which consists in: treating, in an impregnation zone (a), wood chips with a first alkaline liquor; treating the resulting wood chip...  
WO/1999/020829A1
The invention concerns a method for making chemical paper pulp comprising a batch cooking process including the following steps: (1) treating wood chips using an alkaline solution in a batch reactor (a) so as to transform at least part o...  
WO/1999/020828A1
An improved method for acid sulfite pulping of wood chips in which wood chips are digested in an acid sulfite pulping liquor to produce a wood pulp is disclosed, which improvement includes adding to the chips, prior to mixing with the ac...  
WO/1999/018285A1
The present invention provides a method for pre-processing and processing straw pulp and forming a byproduct suitable for animal consumption. The present invention also provides a paper product comprising straw pulp. According to the pre...  
WO/1999/014423A1
The invention relates to a process for producing pulp from cellulosic fiber material with improved polysulfide regeneration alone or in combination with polysulfide cooking. The cellulosic fiber material is impregnated with polysulfide b...  
WO/1999/014424A1
Apparatus for production of pulp from plant material comprising, in sequence, a first feeder (9) for regulating the input of raw material, a boiler (11) for cooking the material to generate pulp, a second feeder (13) maintained at lower ...  
WO/1999/010384A1
The invention relates to a raw material for use in the preparation of pectin and related compounds, the raw material being pressed, stabilized sugar beet pulp subjected to biotechnical pre-treatment. In accordance with the invention the ...  
WO/1999/010595A1
The invention relates to a method for removing chemically bound formic acid from a material containing the same, in the presence of free formic acid. The method is characterized in that chemically bound formic acid is allowed to react to...  
WO/1999/009243A1
A method and device for cooking pulp by increasing the effective alkali concentration in the residual phase of the cooking process to substantially improve the residual delignification rate and thus improving the pulp properties such as ...  
WO/1999/009244A1
The present invention claims a new method to depolymerize and/or modify lignin or lignin related compounds by using copper, a copper coordination compound and peroxide in an aqueous solution. The copper coordination compound is applied i...  
WO/1999/007936A1
A method of treating wood chips allows chemical pulp (e.g. kraft pulp) to be produced having enhanced fiber strength properties. In a first zone or stage the chips are cool impregnated (e.g. at a temperature of about 60-120 °C) with a f...  

Matches 451 - 500 out of 2,219