Patents by Inventor Kyösti Valta
Kyösti Valta has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11584804Abstract: A method for controlling discharges of nitrogen compounds in the production of cellulose carbamate (CCA). Microcrystalline cellulose is produced from chemical pulp produced at a pulp mill, such that the chemical pulp is subjected to acid hydrolysis at an elevated temperature to form microcrystalline cellulose (MCC) and hydrolysate, and the MCC is reacted with urea to produce cellulose carbamate whereby ammonia is released. The microcrystalline cellulose production and the cellulose carbamate production are integrated into the pulp mill having a flue gas system such that carbon dioxide from the flue gases is reacted with released ammonia to produce urea, which is used in the carbamate production.Type: GrantFiled: May 21, 2019Date of Patent: February 21, 2023Assignee: ANDRITZ OYInventors: Jukka Kantola, Hannu Råmark, Kyösti Valta, Kari Vanhatalo
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Publication number: 20230022830Abstract: A method for controlling discharges of nitrogen compounds in the production of cellulose carbamate (CCA). Dissolving pulp (DP) or kraft pulp is produced at a pulp mill, and the DP or kraft pulp is activated. The activated pulp is reacted with urea to produce cellulose carbamate whereby ammonia is released. The cellulose carbamate production is integrated into the pulp mill having a flue gas system such that carbon dioxide from the flue gases is reacted with released ammonia to produce urea, which is used in the carbamate production.Type: ApplicationFiled: November 13, 2020Publication date: January 26, 2023Inventors: Hannu RÅMARK, Kyösti VALTA, Kari VANHATALO
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Publication number: 20210206883Abstract: A method for controlling discharges of nitrogen compounds in the production of cellulose carbamate (CCA). Microcrystalline cellulose is produced from chemical pulp produced at a pulp mill, such that the chemical pulp is subjected to acid hydrolysis at an elevated temperature to form microcrystalline cellulose (MCC) and hydrolysate, and the MCC is reacted with urea to produce cellulose carbamate whereby ammonia is released. The microcrystalline cellulose production and the cellulose carbamate production are integrated into the pulp mill having a flue gas system such that carbon dioxide from the flue gases is reacted with released ammonia to produce urea, which is used in the carbamate production.Type: ApplicationFiled: May 21, 2019Publication date: July 8, 2021Inventors: Jukka KANTOLA, Hannu RÅMARK, Kyösti VALTA, Kari VANHATALO
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Publication number: 20200232162Abstract: The present invention relates to a process for treating textile-based materials, typically textile-based waste-materials, to prepare them for further use. The treatment includes two or more chemical and/or enzymatic treatment steps, including at least one alkaline treatment step, all intended to cause at least a partial dissolution of the textile-based material. Particularly, the process is used for the treatment of cotton-based waste materials.Type: ApplicationFiled: April 27, 2018Publication date: July 23, 2020Inventors: Ali Harlin, Marjo Määttänen, Eino Sivonen, Marianna Vehviläinen, Sari Asikainen, Kyösti Valta, Airi Särkilahti
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Patent number: 9611586Abstract: The invention relates to a method for manufacturing cellulose material, the method comprising introducing cellulose fibers as raw material pulp (1) to a system, adding an alkalizing agent into the system in order to absorb the alkalizing agent into the cellulose fibers (1), adding an anionic agent into the system in order to absorb said agent into the cellulose fibers (1), feeding the cellulose fibers (1) to a sieve plate press (6), performing a reaction between the cellulose fibers and the anionic agent at least partly in the sieve plate press (6) in order to produce anionized cellulose fibers having a degree of substitution between 0.05 and 0.35, wherein the reaction is performed at least partly at a consistency of at least 50%. In addition, the invention relates to a system for manufacturing cellulose material and to fibril cellulose produced from anionized cellulose fibers.Type: GrantFiled: November 23, 2012Date of Patent: April 4, 2017Assignee: UPM-KYMMENE CORPORATIONInventors: Eino Sivonen, Kyösti Valta, Markus Nuopponen
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Publication number: 20150225901Abstract: A method of producing dissolving pulp from a recycled fibrous feedstock. The method comprises providing a fibrous material comprising cellulose, lignin and hemicellulose, said fibre source further having a lignin content of 0.1 to 7% lignin and an ash content of up to 3%; subjecting the fibrous material to an alkaline extraction at a temperature of about 0 to 25° C., to produce fibres having a reduced content of hemicellulose; subjecting the fibres thus obtained to a bleaching treatment carried out with oxidative chemical reagents in order to reduce the lignin content of the fibres; and recovering the fibres thus obtained. By means of the method, dissolving pulp can be produced from recycled paper and cardboard products.Type: ApplicationFiled: September 16, 2013Publication date: August 13, 2015Inventors: Sari Asikainen, Marjo Määttänen, Ali Harlin, Kyösti Valta, Eino Sivonen
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Publication number: 20140323714Abstract: The invention relates to a method for manufacturing cellulose material, the method comprising introducing cellulose fibers as raw material pulp (1) to a system, adding an alkalizing agent into the system in order to absorb the alkalizing agent into the cellulose fibers (1), adding an anionic agent into the system in order to absorb said agent into the cellulose 2, 2a, 2b fibers (1), feeding the cellulose fibers (1) to a sieve plate press (6), performing a reaction between the cellulose fibers and the anionic agent at least partly in the sieve plate press (6) in order to produce anionized cellulose fibers having a degree of substitution between 0.05 and 0.35, wherein the reaction is performed at least partly at a consistency of at least 50%. In addition, the invention relates to a system for manufacturing cellulose material and to fibril cellulose produced from anionized cellulose fibers.Type: ApplicationFiled: November 23, 2012Publication date: October 30, 2014Applicant: UPM-KYMMENE CorporationInventors: Eino Sivonen, Kyösti Valta, Markus Nuopponen
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Publication number: 20130269546Abstract: An apparatus for processing and compressing pulp, includes a circular perforated sieve base disc and at least one roll wheel circulating and rotating on the sieve base disc, where the sieve base disc and the at least one roll wheel rotating on the sieve base disc are shaped as bevel gears and make up a bevel gear assembly, by which the rotating force can be introduced in the gears of the bevel gear assembly to be partly converted to a compressive force for compressing the pulp to be processed through perforations in the bevel gear like sieve base disc.Type: ApplicationFiled: December 15, 2011Publication date: October 17, 2013Inventors: Eino Sivonen, Kyösti Valta
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Patent number: 8066903Abstract: A method for preparing a cellulose carbamate solution. Dissolving is performed in two steps, first by moistening cellulose carbamate pulp with a dilute alkaline solution and second by admixing a concentrated alkaline solution, as cold as possible, to the pulp under intensive stirring. The technique utilizes the low freezing point of the aqueous NaOH solution at the concentration of 18%, wherein the freezing point is below ?20° C., and the intensive stirring function of the dissolve mixer device during the dosage. It is possible to prepare solutions of high quality and having high dry matter content in a mixing time of a few minutes only.Type: GrantFiled: November 23, 2006Date of Patent: November 29, 2011Assignee: Valtion Teknillinen TutkimuskeskusInventors: Kyösti Valta, Eino Sivonen, Tero Malm
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Patent number: 7932378Abstract: A process for manufacturing transglycosylation products. According to the process, a starch derivative is reacted at acidic conditions with an alkanol containing 1-6 hydroxyl groups and the reaction product is recovered as such or it is subjected to further processing. According to the method, the transglycosylation reaction between the starch derivatives and the alkanol is carried out in a reactive extrusion process, whereby the reaction can essentially be performed in the absence of liquid media at high yield. The invention also relates to new transglycosylation products of starch derivative, containing anions derived from a phosphorus-containing acid, which are chemically bonded to the product.Type: GrantFiled: October 24, 2003Date of Patent: April 26, 2011Assignee: Valtion Teknillinen TutkimuskeskusInventors: Hannu Mikkonen, Kyösti Valta, Eino Sivonen, Soili Peltonen
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Publication number: 20110046365Abstract: A transglycosylation product, a method of producing the same and use of the product. The transglycosylation product comprises an alkyl or hydroxyalkyl glycoside of a cellulose ester or ether, wherein the alkyl or hydroxyalkyl groups of the glycoside residue comprise a carbon chain having 1 to 4 carbon atoms, and having 0 to 2 free hydroxyl groups and being attached to the 1-carbon of the anhydroglucose unit via an oxy group. The product can be produced by mixing the cellulose derivative with mono-, di- or triol to form a reaction mixture, after which the reaction mixture is heated and the reaction is continued until a clear mixture is obtained. After cooling the recoverable product is suitable for use for example as an adhesive or as a hydrophobic coating.Type: ApplicationFiled: February 25, 2009Publication date: February 24, 2011Applicant: VALTION TEKNILLINEN TUTKIMUSKESKUSInventors: Hannu Mikkonen, Soili Peltonen, Aki Laine, Kyösti Valta, Eino Sivonen, Tero Malm, Juha Sarlin
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Patent number: 7662953Abstract: The invention relates to a method for manufacturing cellulose carbamate. In the method, an auxiliary agent and urea in solution form and possibly in solid form are absorbed into cellulose, and a reaction between cellulose and urea is carried out in a mixture containing cellulose, a liquid, the auxiliary agent, and urea The absorption of the auxiliary agent and urea into cellulose, and the reaction between the cellulose and the auxiliary agent at least partly are carried out in a working device. According to the invention, it is possible to manufacture cellulose carbamate without ammonia, organic solvents or other auxiliary agents, by using only a small quantity of water as a medium.Type: GrantFiled: January 29, 2003Date of Patent: February 16, 2010Assignee: Valtion Teknillinen TutkimuskeskusInventors: Kyösti Valta, Eino Sivonen
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Publication number: 20090283717Abstract: A method for preparing a cellulose carbamate solution. Dissolving is performed in two steps, first by moistening cellulose carbamate pulp with a dilute alkaline solution and second by admixing a concentrated alkaline solution, as cold as possible, to the pulp under intensive stirring. The technique utilizes the low freezing point of the aqueous NaOH solution at the concentration of 18%, wherein the freezing point is below ?20° C., and the intensive stirring function of the dissolve mixer device during the dosage. t is possible to prepare solutions of high quality and having high dry matter content in a mixing time of a few minutes only.Type: ApplicationFiled: November 23, 2006Publication date: November 19, 2009Applicant: Valtion Teknillinen TutkimuskeskusInventors: Kyösti Valta, Eino Sivonen, Tero Malm