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| Number | Title | Issue Date |
| 7892397 | Method of degumming cellulosic fibres A process for producing dissolving pulp includes a degumming step using a degumming liquor which includes hydrogen peroxide and ammonia. ... | 02/22/2011 |
| 7575657 | Method and apparatus for reducing the amount of sludge produced in a pulp and/or paper mill Method and apparatus for reducing the amount of sludges produced in a pulp and/or paper mill. The sludge produced in a pulp and/or paper mill as a result of waste water treatment is conveyed to solid fuel and the produced fuel-sludge mixture is burned in a power boi... | 08/18/2009 |
| 7547374 | Method for impregnating chips in a continuous digestion system A method for impregnating chips in a continuous digestion system with an impregnation vessel and a digester. The digestion system has a heat exchanger arranged between a first return line and a black liquor line. The heat exchanger allows a transfer of heat between ... | 06/16/2009 |
| 7540937 | Method for continuous cooking A procedure for the continuous cooking of chemical pulp, comprising an impregnation vessel 101 and a digester 102. The chips are impregnated in the impregnation vessel 101and are fed after impregnation together with circulation fluid through a t... | 06/02/2009 |
| 7396434 | Catalytic reactor process for the production of commercial grade pulp, native lignin and unicellular protein A continuous and batch system to produce cellulose, native lignin and unicellular protein from any form of vegetation in a closed process. The biomass is mixed in the impregnate solution of nitric acid and/or ammonium hydroxide and water. After a period of time at r... | 07/08/2008 |
| 7384501 | Method for improved turpentine recovery from modern cooking plants A method for the preparation of pulp by means of alkaline cooking, in which method spent liquor is transferred to pressurized tanks, and at least one liquor is expanded corresponding to a temperature difference of 1 to 5° C. The generated steam is led to turpentine... | 06/10/2008 |
| 7374637 | Method of bleaching cellulose pulp with a main conduit for wash liquor and filtrate The method is for bleaching cellulose pulp in a bleach line that has at least two bleaching steps. The filtrate distribution is led up through the bleaching line counter-currently to the flow of cellulose pulp established in the bleaching line. A single joint main c... | 05/20/2008 |
| 7371307 | Kraft pulp yield by heat treatment of polysulphide liquors generated by oxidation Oxidized white liquor is heat treated to increase the concentration of polysulphide measured at 285 or 286 nm (PSUV) or measured at 416 nm (PSVIS) and the PSUV/PSGR or PSVIS/PSGR ratio, whereby the co... | 05/13/2008 |
| 7364640 | Chemimechanical desilication of nonwood plant materials A process for removing silica from nonwood plant materials involving both chemical and mechanical action is described. The silica-rich epidermal cells are liberated mechanically by a pre-pulping and low-consistency refining step and subsequently removed from the pul... | 04/29/2008 |
| 7351306 | Cooking of cellulose pulp in a cooking liquor containing pre-evaporated black liquor The method is for cooking of cellulose pulp in which the raw material, preferably in the form of chips, undergoes a successive elevation of temperature towards the cooking temperature while the chips are first impregnated with an impregnation liquor followed by cook... | 04/01/2008 |
| 7300539 | Treatment of solid containing material derived from effluent A method of treating solid containing material derived from effluent or sludge from a plant for deinking paper, the material containing calcium in the form of one or more insoluble calcium compounds, the method including the steps of treating the material with an ac... | 11/27/2007 |
| 7300542 | Method for inhibiting calcium salt scale Compositions and method of improving inhibition of calcium salt scale formation under the conditions found in chemical pulp processes in which an effective amount of selected phosphonates or phosphonate blends is admixed with the black liquor composition recovered f... | 11/27/2007 |
| 7294225 | Process for production of synthesis gas in combination with the maintenance of the energy balance for a pulp mill A process (44) for the production of pulp and paper (28), recycling of cooking chemicals (3, 29), combustion of biomass (30, 37) and generation of heat and electric energy (27, 40) comprising a pulp and paper mill (28), in t... | 11/13/2007 |
| 7282115 | Method for mitigating the interference caused by high-molecular weight-by-products in pulping processes Separation of dissolved and colloidal high molecular weight organic by-products from liquors or filtrates in a cellulosic pulping process to improve the overall efficiency of the process. ... | 10/16/2007 |
| 7270725 | Pretreatment of chips with white liquor prior to a treatment with black liquor The method is for the manufacture of cooked cellulose pulp in which the starting material, preferably chips, undergoes a successive increase in temperature towards cooking temperature. This is done while the chips are first treated in a pre-treatment zone in which t... | 09/18/2007 |
| 7270726 | Method for the production of green liquor The method is for production of green liquor in association with a causticizing process during recovery of chemicals in manufacture of sulphate pulp. A smelt (14) of chemicals principally consisting of Na2S and Na2CO3 from a soda boiler ... | 09/18/2007 |
| 7241363 | Methods to decrease scaling in digester systems One aspect of this invention relates to a method and digester for reducing the deposition of calcium-based scale in a wood chip digester including extraction from the digester of first and second quantities of cooking liquor having respective first and second calciu... | 07/10/2007 |
| 7235169 | Method and apparatus for purging and disinfecting water An alkaline electrolyte solution is electrolyzed by a diaphragm-less electrolyzer to provide electrolytic water as purging and disinfecting water. The alkaline electrolyte solution is a mixture of at least one alkaline electrolyte selected from caustic sodium carbon... | 06/26/2007 |
| 7217338 | Process for continuously cooking chemical cellulose pulp The process is for continuously cooking chemical pulp in a digester system consisting of at least one vessel for impregnating and cooking comprising an inlet into which a mixture of chips and process liquid is fed. The chips are impregnated at a predetermined impreg... | 05/15/2007 |
| 7214291 | Method for the modification of cellulose fibres The invention relates to a method for the modification of cellulose fiber with the object of increasing the strength properties of the pulp. Cellulose derivative, preferably in the form of CMC, is added in association with alkali cooking and/or delignification of ce... | 05/08/2007 |
| 7189328 | Method for extraction of dissolved trace materials from solution A method for separating dissolved materials, including organic and inorganic solids and volatile constituents, from a liquid or aqueous solvent is disclosed. The method first extracts water from the flow stream being treated using a crystallization apparatus which f... | 03/13/2007 |
| 7182835 | Two-stage chlorine bleaching process with filtrate recirculation Methods for bleaching chemical pulp are disclosed including dewatering the pulp to a concentration of from 25 to 40%, bleaching in a first chlorine dioxide stage, followed by a second alkaline bleaching stage, followed by a third chlorine dioxide bleaching stage, de... | 02/27/2007 |
| 7179437 | Feeding device and process and feeding system which utilize the feeding device Feeding device for feeding burned lime to a reaction vessel for causticizing a soda liquor to caustic soda. The feeding device, in its upper part, comprises an inlet for a slurry of the burned lime and the soda liquor for formation of said slurry inside said feeding... | 02/20/2007 |
| 7172677 | Method for inhibiting calcium salt scale Compositions and method for improving inhibition of calcium salt scale formation under the conditions found in chemical pulp processes in which an effective amount of selected phosphonates or phosphonate blends is admixed with the aqueous digester composition in a c... | 02/06/2007 |
| 7169263 | Coarse dirt collector for removing coarse material from a pulper and corresponding method The invention relates to a coarse dirt collector (7) for removing coarse material from a pulper (1). The coarse dirt collector (7) comprises a support arm (8) with a collecting basket (9). The collecting basket (9) consists ... | 01/30/2007 |
| 7157021 | Methods and compositions for dust and erosion control The invention is directed to compositions and methods for treating a particulate and for dust and erosion control. The compositions comprise a dissolved sugar solid. Preferably, the composition comprises a dissolved sugar solid, further in combination with a salt or... | 01/02/2007 |
| 7156952 | Method and arrangement for oxygen delignification of cellulose pulp The invention relates to a method and arrangement for alkaline oxygen delignification of cellulose pulp. By adding alkali in the final phase of the oxygen delignification one can ensure that an optimal predetermined end-pH is obtained. This provides advantages in th... | 01/02/2007 |
| 7127913 | Crystallisation of materials from aqueous solutions The invention is directed to a process for recovering a crystalline material from an aqueous solution, which solution also contains organic contaminants, in which process the material is crystallised from the aqueous solution by freeze crystallising at a eutectic fr... | 10/31/2006 |
| 7097739 | Method for the production of improved pulp Compositions and method for improving properties of pulp produced or reducing the digester cycle time in alkaline chemical pulping processes in which an effective amount of at least one selected phosphonate or carboxylate compound or mixtures thereof is admixed with... | 08/29/2006 |
| 7056418 | Cooking method for pulp A lignocellulose material is cooked by means of an alkaline cooking liquor containing polysulfides in the presence of a quinone-hydroquinone compound, of which the oxidation-reduction potential in the form present during the cooking, which potential is a value calcu... | 06/06/2006 |
| 7048900 | Method and apparatus for production of precipitated calcium carbonate and silicate compounds in common process equipment A method and apparatus for the production of calcium carbonate and calcium silicate in common superatmospheric reactors. Multiple reactors can be provided for switching production between reactors, and advantageously utilizing process waste heat. On site production ... | 05/23/2006 |
| 7029553 | Urea sulfate and urea hydrochloride in paper and pulp processing The present invention relates to the use of urea sulfate or urea hydrochloride, or both, in process streams in the paper and pulping industries to control pH, to bring about flocculation or precipitation of various materials, and to replace all or part of the sulfur... | 04/18/2006 |
| 7014684 | Method for the treatment of waste gas from a cellulose plant A process and a device for cleaning waste gas from pulp production, especially for cleaning waste gases from a bleaching reactor. Aerosols contained in the waste gas are removed and the gaseous impurities are scrubbed out of the waste gas by a scrubbing liquid. ... | 03/21/2006 |
| 6986828 | Process for producing low DP microcrystalline cellulose A process for producing microcrystalline cellulose. The process comprising the following steps: a) preparation of a pulp by repulping, b) pressing of the pulp obtained in a), c) decompaction of the... | 01/17/2006 |
| 6946057 | Alkaline process for the manufacturing of pulp using alkali metaborate as buffering alkali The present invention relates to a new and environmentally sound process for the manufacturing of a chemical pulp from lignocellulosic material with an integrated recovery system for recovery of pulping chemicals. The process is carried out in several stages involvi... | 09/20/2005 |
| 6931757 | Method for conditioning fibrous substances The invention relates to a method for conditioning fibrous substances, especially wood fibers that are dried in a dryer. In a substantially closed drying circuit (1) a vapor-gas mixture is guided in said dryer as a circulating gas (referred to as vapors) that... | 08/23/2005 |
| 6923888 | Process for recovering organic acids from bleaching liquors The invention relates to a process for treating bleaching liquors from pulping processes based on organic acids. The process is characterized in that inorganic acid, such as nitric acid, phosphoric acid and/or sulphuric acid, is added into a bleaching liquor obtaine... | 08/02/2005 |
| 6896810 | Process for producing alkaline treated cellulosic fibers Systems and methods by which to subject cellulosic fibers to alkaline treatment are provided. The systems and methods of the invention include equipment, such as nanofiltration units and slurry concentrators, which result in a lowered overall consumption of alkaline... | 05/24/2005 |
| 6890404 | Composition for the production of improved pulp Compositions and method for improving properties of pulp produced or reducing the digester cycle time in alkaline chemical pulping processes in which an effective amount of at least one selected phosphonate or carboxylate compound or mixtures thereof is admixed with... | 05/10/2005 |
| 6869503 | Composition for inhibiting calcium salt scale Compositions and method of improving inhibition of calcium salt scale formation under the conditions found in chemical pulp processes in which an effective amount of selected phosphonates or phosphonate blends is admixed with the black liquor composition recovered f... | 03/22/2005 |
