Patents by Inventor Geert-Jan Witkamp
Geert-Jan Witkamp 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: 11834355Abstract: The invention relates to a method and system for phosphate recovery from a stream such as waste flow, sewage or another sludge stream. The method comprises the steps of: providing an incoming stream comprising an initial amount of phosphate; dosing/controlling iron salt to the stream such that precipitates are formed in the stream, wherein the precipitates comprise vivianite like structures comprising more than 60% of the initial amount of phosphate in the incoming stream, and preferably also the steps of: separating the vivianite like structures from the stream; and recovering the phosphates from the separated vivianite like structures.Type: GrantFiled: March 14, 2018Date of Patent: December 5, 2023Assignee: Kemira OyjInventors: Philipp Karl Wilfert, Leendert Date Korving, Peter Carlo Rem, Geert-Jan Witkamp, Marinus Cornelis Maria Van Loosdrecht, Achim Lulian Dugulan, Kees Goubitz, Simon Peter Maria Berkhout
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Patent number: 10865334Abstract: The invention is directed to a process for extracting materials from biological material, which process is characterized in that the naturally occurring biological material is treated with an extractant consisting of a deep eutectic solvent of natural origin or a an ionic liquid of natural origin to produce a biological extract of natural origin dissolved in the said solvent or ionic liquid.Type: GrantFiled: August 5, 2014Date of Patent: December 15, 2020Assignee: Universiteit LeidenInventors: Jacob van Spronsen, Geert-Jan Witkamp, Frank Hollman, Young Hae Choi, Robert Verpoorte
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Publication number: 20200010342Abstract: The invention relates to a method and system for phosphate recovery from a stream such as waste flow, sewage or another sludge stream. The method comprises the steps of: providing an incoming stream comprising an initial amount of phosphate; dosing/controlling iron salt to the stream such that precipitates are formed in the stream, wherein the precipitates comprise vivianite like structures comprising more than 60% of the initial amount of phosphate in the incoming stream, and preferably also the steps of: separating the vivianite like structures from the stream; and recovering the phosphates from the separated vivianite like structures.Type: ApplicationFiled: March 14, 2018Publication date: January 9, 2020Inventors: Philipp Karl Wilfert, Leendert Date Korving, Peter Carlo Rem, Geert-Jan Witkamp, Marinus Cornelis Maria Van Loosdrecht, Achim Lulian Dugulan, Kees Goubitz, Simon Peter Maria Berkhout
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Patent number: 9938547Abstract: The invention is directed to a process for the preparation of 2,5-furandicarboxylic acid (FDCA) by fermentation comprising fermenting a suitable starting compound to produce an aqueous solution of a salt of FDCA having a pH of at least 7, optionally removing solids from said solution, e.g. by filtration, subsequently freeze crystallizing the said salt of FDCA from said solution at said pH, isolating the said FDCA salt in the form of solid crystals, preparing an aqueous solution of said salt and crystallizing FDCA as the free acid from said solution at an acidic pH.Type: GrantFiled: June 20, 2014Date of Patent: April 10, 2018Assignee: TECHNISCHE UNIVERSITEIT DELFTInventors: Jacob van Spronsen, Geert-Jan Witkamp, Bart de Graaff
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Patent number: 9441146Abstract: The invention is directed to a process for extracting materials from biological material, which process is characterized in that the naturally occurring biological material is treated with an extractant consisting of a deep eutectic solvent of natural origin or a an ionic liquid of natural origin to produce a biological extract of natural origin dissolved in the said solvent or ionic liquid.Type: GrantFiled: June 7, 2011Date of Patent: September 13, 2016Assignee: Universiteit LeidenInventors: Jacob van Spronsen, Geert-Jan Witkamp, Frank Hollman, Young Hae Choi, Robert Verpoorte
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Patent number: 9371242Abstract: The invention is directed to a process for the recovery or removal of one or more crystallizable compounds from an aqueous solution containing, apart from the said crystallizable compounds, one or more organic or inorganic scale-forming or scale-inducing materials having a lower solubility in water than the said crystallizable compounds, said process comprising subjecting the said solution to at least one eutectic freeze crystallization step with recovery of ice and said one or more crystallizable compounds in crystalline form, recycling at least part of the mother liquor formed in the said eutectic crystallization step and subjecting the said recycle to a treatment with seed crystals for said scale forming or scale inducing compounds, removing at least part of the solid material obtained in said treatment step and recycle of the aqueous liquid thus obtained to the eutectic freeze crystallization step or to the feed thereto.Type: GrantFiled: October 4, 2012Date of Patent: June 21, 2016Assignee: TECHNISCHE UNIVERSITEIT DELFTInventors: Jacob Van Spronsen, Geert-Jan Witkamp
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Publication number: 20160145662Abstract: The invention is directed to a process for the preparation of 2,5-furandicarboxylic acid (FDCA) by fermentation comprising fermenting a suitable starting compound to produce an aqueous solution of a salt of FDCA having a pH of at least 7, optionally removing solids from said solution, e.g. by filtration, subsequently freeze crystallizing the said salt of FDCA from said solution at said pH, isolating the said FDCA salt in the form of solid crystals, preparing an aqueous solution of said salt and crystallizing FDCA as the free acid from said solution at an acidic pH.Type: ApplicationFiled: June 20, 2014Publication date: May 26, 2016Applicant: Technische Universiteit DelftInventors: Jacob van Spronsen, Geert-Jan Witkamp, Bart de Graaff
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Publication number: 20150344319Abstract: A method for preparing a calcium carbonate gel, comprising a reaction between slaked lime in solid, dry from, and of alcohol so as to form an alcoholic suspension of calcium alcoholate, an injection of carbon dioxide into said suspension, and gelling of the suspension as a precipitated calcium carbonate alcogel, this alcogel then being able to be dried into an aerogel or xerogel of calcium carbonate.Type: ApplicationFiled: January 30, 2014Publication date: December 3, 2015Inventors: Geert Jan Witkamp, Sergio Andres Perez Escobar, Robert Sebastian Gaertner
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Publication number: 20140374361Abstract: The invention is directed to a process for the recovery or removal of one or more crystallizable compounds from an aqueous solution containing, apart from the said crystallizable compounds, one or more organic or inorganic scale- forming or scale-inducing materials having a lower solubility in water than the said crystallizable compounds, said process comprising subjecting the said solution to at least one eutectic freeze crystallization step with recovery of ice and said one or more crystallizable compounds in crystalline form, recycling at least part of the mother liquor formed in the said eutectic crystallization step and subjecting the said recycle to a treatment with seed crystals for said scale forming or scale inducing compounds, removing at least part of the solid material obtained in said treatment step and recycle of the aqueous liquid thus obtained to the eutectic freeze crystallization step or to the feed thereto.Type: ApplicationFiled: October 4, 2012Publication date: December 25, 2014Inventors: Jacob Van Spronsen, Geert-Jan Witkamp
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Publication number: 20140341934Abstract: The invention is directed to a process for extracting materials from biological material, which process is characterized in that the naturally occurring biological material is treated with an extractant consisting of a deep eutectic solvent of natural origin or a an ionic liquid of natural origin to produce a biological extract of natural origin dissolved in the said solvent or ionic liquid.Type: ApplicationFiled: August 5, 2014Publication date: November 20, 2014Inventors: Jacob van Spronsen, Geert-Jan Witkamp, Frank Hollman, Young Hae Choi, Robert Verpoorte
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Publication number: 20130149322Abstract: The invention is directed to a process for extracting materials from biological material, which process is characterized in that the naturally occurring biological material is treated with an extractant consisting of a deep eutectic solvent of natural origin or a an ionic liquid of natural origin to produce a biological extract of natural origin dissolved in the said solvent or ionic liquid.Type: ApplicationFiled: June 7, 2011Publication date: June 13, 2013Applicant: UNIVERSITEIT LEIDENInventors: Jacob van Spronsen, Geert-Jan Witkamp, Frank Hollman, Young Hae Choi, Robert Verpoorte
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Publication number: 20110138547Abstract: The present invention relates to a method of dyeing a substrate with a reactive dyestuff in supercritical or near supercritical carbon dioxide, said substrate being selected from the group consisting of cellulose fibres, modified cellulose fibres, protein fibres and of synthetic fibres, or any combination thereof, wherein the method comprises the subsequent steps of: pre-treating the substrate by wetting the substrate with a fluid medium containing at least 10 wt. %, preferably at least 40 wt. % of one or more organic hydrogen bond acceptor compounds selected from the group consisting of C1-C6 alkanols, dimethyl sulfoxide, dimethylformamide, acetone, butan-2-one, dimethyl ether, methyl acetate and ethyl acetate; dyeing the substrate by contacting the pre-treated substrate with supercritical or near supercritical carbon dioxide containing a reactive dyestuff.Type: ApplicationFiled: February 8, 2011Publication date: June 16, 2011Inventors: Maria Vanesa FERNANDEZ CID, Geert Jan Witkamp, Kathryn Nicole Teesink-Gerstner, Wilhelmus Johannes Theodorus Veugelers, Geert Feye Woerlee
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Patent number: 7938865Abstract: The present invention relates to a method of dyeing a substrate with a reactive dyestuff in supercritical or near supercritical carbon dioxide, said substrate being selected from the group consisting of cellulose fibers, modified cellulose fibers, protein fibers and of synthetic fibers, or any combination thereof, wherein the method comprises the subsequent steps of: pre-treating the substrate by wetting the substrate with a fluid medium containing at least 10 wt. %, preferably at least 40 wt. % of one or more organic hydrogen bond acceptor compounds selected from the group consisting of C1-C6 alkanols, dimethyl sulfoxide, dimethylformamide, acetone, butan-2-one, dimethyl ether, methyl acetate and ethyl acetate; dyeing the substrate by contacting the pre-treated substrate with supercritical or near supercritical carbon dioxide containing a reactive dyestuff.Type: GrantFiled: November 4, 2005Date of Patent: May 10, 2011Assignee: Feyecon Development & Implementation B.V.Inventors: Maria Vanesa Fernandez Cid, Geert Jan Witkamp, Kathryn Nicole Teesink-Gerstner, Wilhelmus Johannes Theodorus Veugelers, Geert Feye Woerlee
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Patent number: 7777012Abstract: The invention relates to a method of preparing a protein aggregate, wherein an aqueous protein solution is acidified with a pH that lies above the isoelectric point of the protein. In accordance with the invention, a first protein, which through acidification is able to form a protein aggregate, is acidified in the presence of a second protein in the aqueous solution in order to form a coaggregate comprising the first and second protein, wherein the second protein under identical temperature conditions and pH does not form a protein aggregate in the absence of the first protein. Acidification preferably occurs with the aid of CO2.Type: GrantFiled: March 15, 2005Date of Patent: August 17, 2010Assignee: Technische Universiteit DelftInventors: Marijana Golubovic, Marcel Ottens, Geert Jan Witkamp, Lucas Antonius Maria Van Der Wielen
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Publication number: 20100186444Abstract: Apparatus for separating solids from a mixture or solution, comprising an outer wall provided with an inlet for the mixture or solution and provided with a first discharge for discharging an ice slurry and a second discharge for discharging a salt slurry, one or more raking or scraping elements for scraping solidified material from cooled wall portions which are cooled at or close to a temperature where the mixture or solution solidifies, preferably the eutectic temperature thereof.Type: ApplicationFiled: September 21, 2009Publication date: July 29, 2010Applicant: Technische Universiteit DelftInventors: J. A. Evers, Johannes van Spronsen, Elif Fatma Genceli Güner, Marcos Rodriguez Pascual, Geert-Jan Witkamp
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Patent number: 7731763Abstract: The present invention relates to a method of dyeing a substrate with a reactive dyestuff in supercritical or near supercritical carbon dioxide, said substrate being selected from the group consisting of cellulose fibers; modified cellulose fibers; protein fibers; synthetic fibers and any combination thereof, wherein the method comprises dyeing said substrate by contacting the substrate with supercritical or near supercritical carbon dioxide containing a reactive dyestuff and one or more acids in a concentration of at least 0.05 mol.Type: GrantFiled: November 4, 2005Date of Patent: June 8, 2010Assignee: Feyecon Development & Implementation B.V.Inventors: Maria Vanesa Fernandez Cid, Geert Jan Witkamp, Geert Feye Woerlee, Wilhelmus Johannes Theodorus Veugelers
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Publication number: 20100115988Abstract: The invention is directed to a process for the treatment of an aqueous solution comprising sodium carbonate and/or sodium bicarbonate and sodium molybdate, said process comprising freeze crystallising the solution at the eutectic freezing point thereof and recovering substantially pure ice crystals, substantially pure sodium carbonate and/or sodium bicarbonate and an aqueous product solution containing dissolved sodium molybdate.Type: ApplicationFiled: September 22, 2009Publication date: May 13, 2010Applicant: Technische Universiteit DelftInventors: Geert-Jan Witkamp, Johannes van Spronsen, Melis Hasselaar
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Publication number: 20080274953Abstract: The invention relates to a method of preparing a protein aggregate, wherein an aqueous protein solution is acidified with a pH that lies above the isoelectric point of the protein. In accordance with the invention, a first protein, which through acidification is able to form a protein aggregate, is acidified in the presence of a second protein in the aqueous solution in order to form a coaggregate comprising the first and second protein, wherein the second protein under identical temperature conditions and pH does not form a protein aggregate in the absence of the first protein. Acidification preferably occurs with the aid of CO2.Type: ApplicationFiled: March 15, 2005Publication date: November 6, 2008Applicant: Technische Universiteit DelftInventors: Marijana Golubovic, Marcel Ottens, Geert Jan Witkamp, Lucas Antonius Maria Van Der Wielen
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Patent number: 7127913Abstract: 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 freezing point of the solution.Type: GrantFiled: October 20, 2000Date of Patent: October 31, 2006Assignees: Technische Universiteit Delft, Kemira GrowHow OyjInventors: Geert-Jan Witkamp, Johannes Pieter Vrijenhoef, Johannes de Graauw, Frank van der Ham
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Patent number: 6747173Abstract: The invention relates to a method for the preparation of lactic acid and calcium sulphate, in which (a) an aqueous solution that contains lactate is reacted with sulphuric acid at a temperature that is essentially higher than the transition temperature of calcium sulphate dihydrate (CaSO4.2H2O), with the formation of a mixture that contains calcium sulphate hemihydrate and lactic acid, (b) the mixture from step (a) is subjected to at least one recrystallisation step at a temperature that is essentially lower than the transition temperature of calcium sulphate dihydrate, with the formation of a precipitate of calcium sulphate dihydrate and an aqueous solution of lactic acid, and (c) the precipitate of calcium sulphate dihydrate is separated off from the aqueous solution of lactic acid.Type: GrantFiled: August 29, 2002Date of Patent: June 8, 2004Assignee: Purac Biochem B.V.Inventors: Markus Gerkema, Aldwin Korevaar, Damien Michel Andre Camelot, Jan Van Breugel, Geert-Jan Witkamp, Agusti CerdàBaro