Patents by Inventor Hans Theliander
Hans Theliander 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: 9777033Abstract: The method is for separation of lignin from original black liquor (BLIN) that has a first precipitation phase (PR1/PR2) for precipitation of lignin by a first acidification using acidifier, CO2, at alkaline conditions, then separating a lignin cake with subsequent suspension of the lignin cake in a strong acid in order to leach out metals from the lignin followed by dewatering and obtaining a clean lignin product LP. Lignin germ particles (LG) are added to the original black liquor in the first precipitation stage, preferably between two phases in said precipitation stage, in order to increase lignin particle growth on such lignin germ particles instead of spontaneous nucleation of lignin particles in said original black liquor. This results in improved filterability in subsequent dewatering and lignin cake formation and hence an increased lignin yield.Type: GrantFiled: March 16, 2012Date of Patent: October 3, 2017Assignee: VALMET ABInventors: Fredrik Ohman, Hans Theliander, Per Tomani, Peter Axegard
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Patent number: 9382389Abstract: The method is for controlling a sodium and sulphur balance of a pulp mill while separating lignin from black liquor. Lignin is precipitated by using an acid followed by filtration. The lignin filter cake thus obtained is re-suspended in acidic liquid and dewatered to form a second cake. The filtrate obtained after dewatering of the second cake is returned for washing and suspension of the first cake. Sodium sulphate-rich ESP (electrostatic precipitator) dust produced in the recovery boiler is used in the washing of the precipitated lignin cake.Type: GrantFiled: February 21, 2008Date of Patent: July 5, 2016Assignee: Valmet AktiebolagInventors: Fredrik Ohman, Hans Theliander, Per Tomani, Peter Axegard
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Patent number: 9121134Abstract: The present invention relates to a process for producing an oxidized cellulose pulp fibrillar network and a composite with lignocellulosic fibers comprising the following steps: (a) oxidizing a cellulose pulp to obtain about 0.3 to 2.5 mmol carboxylic groups per gram cellulose pulp; and about 0.1 to 5.0 mmol aldehyde groups per gram cellulose pulp; (b) homogenization of the cellulose pulp of step (a) wherein the cellulose fibers are refined to provide a cellulose pulp comprising 0-50% of fibers having an average length 0.7 mm-2.1 mm; and 50-100% of fibers having a particle size of 0.05-500 micrometer (?m); and optionally (c) combining with lignocellulosic fiber. Also step (d) drying of the cellulose pulp obtained by step (b) or step (c) may be included in the process.Type: GrantFiled: January 18, 2011Date of Patent: September 1, 2015Assignee: Sodra Skogsagarna Ekonomisk ForeningInventors: Fredrik Wernersson, Harald Brelid, Hans Theliander, Kristoffer Lund
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Publication number: 20150119559Abstract: The method is for separation of lignin from original black liquor (BLIN) that has a first precipitation phase (PR1/PR2) for precipitation of lignin by a first acidification using acidifier, CO2, at alkaline conditions, then separating a lignin cake with subsequent suspension of the lignin cake in a strong acid in order to leach out metals from the lignin followed by dewatering and obtaining a clean lignin product LP. Lignin germ particles (LG) are added to the original black liquor in the first precipitation stage, preferably between two phases in said precipitation stage, in order to increase lignin particle growth on such lignin germ particles instead of spontaneous nucleation of lignin particles in said original black liquor. This results in improved filterability in subsequent dewatering and lignin cake formation and hence an increased lignin yield.Type: ApplicationFiled: March 16, 2012Publication date: April 30, 2015Inventors: Fredrik Ohman, Hans Theliander, Per Tomani, Peter Axegard
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Patent number: 8815052Abstract: A method for precipitating (separation) of lignin, using small amounts of acidifying agents, whereby a lignin product or an intermediate lignin product is obtained which can be used as fuel or chemical feed stock (or as a chemical or a raw material for further refining), from a lignin containing liquid/slurry, such as black liquor. A method for separation of lignin from a lignin containing liquid/slurry, such as black liquor, whereby a more pure lignin is obtained, a lignin product or an intermediate lignin product obtainable by the above methods, and use, preferably for the production of heat or for use as chemical, of the lignin product or intermediate lignin product are also disclosed.Type: GrantFiled: October 3, 2005Date of Patent: August 26, 2014Assignee: LignoBoost ABInventors: Fredrik Öhman, Hans Theliander, Magnus Norgren, Per Tomani, Peter Axegård
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Patent number: 8486224Abstract: Method for separating lignin from black liquor includes the following steps: a) precipitating lignin by acidifying black liquor and thereupon dewatering, b) suspending the lignin filter cake obtained in step a) to obtain a second lignin suspension and adjusting the pH level to approximately that of the washing water of step d) below, c) dewatering of the second lignin suspension, d) adding washing water and performing a displacement washing at substantially constant conditions without any dramatic gradients in the pH, and e) dewatering the lignin cake produced in step d) into a high dryness and displacing the remaining washing liquid in the filter cake, whereby a lignin product is obtained which has an even higher dryness after the displacement washing of step d). The lignin product or an intermediate lignin product obtained by the method, and its use, preferably for the production of heat or chemicals is also disclosed.Type: GrantFiled: September 8, 2005Date of Patent: July 16, 2013Assignee: LignoBoost ABInventors: Fredrik Öhman, Hans Theliander, Per Tomani, Peter Axegard
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Publication number: 20130025807Abstract: The present invention relates to a process for producing an oxidised cellulose pulp fibrillar network and a composite with lignocellulosic fibres comprising the following steps: (a) oxidising a cellulose pulp to obtain about 0.3 to 2.5 mmol carboxylic groups per gram cellulose pulp; and about 0.1 to 5.0 mmol aldehyde groups per gram cellulose pulp; (b) homogenisation of the cellulose pulp of step (a) wherein the cellulose fibres are refined to provide a cellulose pulp comprising 0-50% of fibres having an average length 0.7 mm-2.1 mm; and 50-100% of fibres having a particle size of 0.05-500 micrometer (?m); and optionally (c) combining with lignocellulosic fibre. Also step (d) drying of the cellulose pulp obtained by step (b) or step (c) may be included in the process.Type: ApplicationFiled: January 18, 2011Publication date: January 31, 2013Applicant: SÖDRA SKOGSÄGARNA EKONOMISK FÖRENINGInventors: Fredrik Wernersson, Harald Brelid, Hans Theliander, Kristoffer Lund
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Publication number: 20120302440Abstract: An absorbent article including a freeze dried composite material. The freeze dried composite material includes cellulosic pulp (e.g. CTMP) and an absorbent material. The absorbent material includes microfibrillated cellulose (MFC) with a specified content of carboxylate groups.Type: ApplicationFiled: January 18, 2011Publication date: November 29, 2012Applicant: SCA HYGIENE PRODUCTS ABInventors: Hans Theliander, Fredrik Wernersson, Harald Brelid, Kristoffer Lund, Charlotta Hanson, Ingrid Gustafson, Torgny Falk
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Patent number: 8172981Abstract: A method for controlling the sodium and sulphur balance of a pulp mill while separating lignin from black liquor, and also a lignin product or an intermediate lignin product obtainable by the method. The present invention also provides use of a lignin product or an intermediate lignin product for the production of fuel (solid, gaseous or liquid) or materials.Type: GrantFiled: February 21, 2008Date of Patent: May 8, 2012Assignee: LignoBoost ABInventors: Per Tomani, Fredrik Öhman, Hans Theliander, Peter Axegard
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Publication number: 20100325947Abstract: The method is for controlling a sodium and sulphur balance of a pulp mill while separating lignin from black liquor. Lignin is precipitated by using an acid followed by filtration. The lignin filter cake thus obtained is re-suspended in acidic liquid and dewatered to form a second cake. The filtrate obtained after dewatering of the second cake is returned for washing and suspension of the first cake. Sodium sulphate-rich ESP (electrostatic precipitator) dust produced in the recovery boiler is used in the washing of the precipitated lignin cake.Type: ApplicationFiled: February 21, 2008Publication date: December 30, 2010Applicant: LIGNOBOOST ABInventors: Fredrik Ohman, Hans Theliander, Per Tomani, Peter Axegard
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Publication number: 20080214796Abstract: A method for controlling the sodium and sulphur balance of a pulp mill while separating lignin from black liquor, and also a lignin product or an intermediate lignin product obtainable by the method. The present invention also provides use of a lignin product or an intermediate lignin product for the production of fuel (solid, gaseous or liquid) or materials.Type: ApplicationFiled: February 21, 2008Publication date: September 4, 2008Inventors: Per Tomani, Fredrik Ohman, Hans Theliander, Peter Axegard
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Publication number: 20080047674Abstract: Method for separating lignin from black liquor includes the following steps: a) precipitating lignin by acidifying black liquor and thereupon dewatering, b) suspending the lignin filter cake obtained in step a) to obtain a second lignin suspension and adjusting the pH level to approximately that of the washing water of step d) below, c) dewatering of the second lignin suspension, d) adding washing water and performing a displacement washing at substantially constant conditions without any dramatic gradients in the pH, and e) dewatering the lignin cake produced in step d) into a high dryness and displacing the remaining washing liquid in the filter cake, whereby a lignin product is obtained which has an even higher dryness after the displacement washing of step d). The lignin product or an intermediate lignin product obtained by the method, and its use, preferably for the production of heat or chemicals is also disclosed.Type: ApplicationFiled: September 8, 2005Publication date: February 28, 2008Inventors: Fredrik Ohman, Hans Theliander, Per Tomani, Peter Axegard
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Publication number: 20080051566Abstract: A method for precipitating (separation) of lignin, using small amounts of acidifying agents, whereby a lignin product or an intermediate lignin product is obtained which can be used as fuel or chemical feed stock (or as a chemical or a raw material for further refining), from a lignin containing liquid/slurry, such as black liquor. A method for separation of lignin from a lignin containing liquid/slurry, such as black liquor, whereby a more pure lignin is obtained, a lignin product or an intermediate lignin product obtainable by the above methods, and use, preferably for the production of heat or for use as chemical, of the lignin product or intermediate lignin product are also disclosed.Type: ApplicationFiled: October 3, 2005Publication date: February 28, 2008Inventors: Fredrik Ohman, Hans Theliander, Magnus Norgren, Per Tomani, Peter Axegard
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Patent number: 4760650Abstract: The invention relates to a method of drying a particulate material which is thereafter to be heat-treated, the material and a gaseous drying medium being brought in contact with each other in a drying apparatus, where water is made to pass from the material to the drying medium by heating. According to the invention a pressure above atmospheric is maintained in the drying apparatus and the drying medium in the drying apparatus is substantially steam. Heating is carried out by means of excess heat generated in the heat treatment.Type: GrantFiled: November 22, 1985Date of Patent: August 2, 1988Inventors: Hans Theliander, Urban Gren