Patents by Inventor Herbert Sixta
Herbert Sixta 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).
-
Recycling of acid-superbase conjugate ionic liquids by water removal in the lyocell spinning process
Publication number: 20230203717Abstract: According to an example aspect of the present invention, there is provided A process for the production of a cellulose filaments or films, comprising the steps of dissolving a cellulose substrate in an ionic liquid consisting of the superbase cation 7-methyl-1,5,7-triazabicyclo[4.4.0]dec-5-enium [mTBDH]+ and an anion to produce a solution forming a spinning dope, said anion being derived from an acid which is present at a stoichiometric excess to the superbase, extruding the spinning dope through a spinneret in a coagulation bath containing water to form filaments or films from the solution, withdrawing ionic liquid in an aqueous mixture with water from the coagulation bath, recovering the ionic liquid [mTBDH][OAc] from the aqueous mixture by removing water and optionally recycling the recovered ionic liquid to the dissolution step.Type: ApplicationFiled: May 19, 2020Publication date: June 29, 2023Inventors: Herbert Sixta, Sherif Elsayed, Inge Schlapp-Hackl, Joanna Witos, Sanna Hellsten, Petri Uusi-Kyyny, Michael Hummel, Ville Alopaeus -
Patent number: 11549200Abstract: According to an example aspect of the present invention, there is provided A process for making a cellulose fibre or film comprising the steps of dissolving pulp in an ionic liquid containing a cationic 1,5,7-triazabicyclo[4.4.0]dec-5-enium [TBDH]+ moiety and an anion selected from the group according to Formula a), Formula b) and Formula c), wherein each of R, R2, R3, R4, R5, R7, R8, R9 and R10 is H or an organyl radical and X? is selected from the group consisting of halides, pseudohalides, carboxylates, alkyl sulphite, alkyl sulphate, dialkylphosphite, dialkyl phosphate, dialkyl phosphonites and dialkyl phosphonates, to provide a spinning dope, extruding the spinning dope through a spinneret to form one or more filaments, and a step selected from the group consisting of spinning cellulose fibres from the solution, and extruding a cellulose film from the solution.Type: GrantFiled: January 30, 2018Date of Patent: January 10, 2023Assignees: Aalto University Foundation sr, Helsingin YliopistoInventors: Herbert Sixta, Michael Hummel, Kadvaël Le Boulch, Ilkka Kilpeläinen, Alistair W.T. King, Jussi Helminen, Sanna Hellsten
-
Publication number: 20220380941Abstract: Colored lyocell type fibers comprising respun coloured recycled fibers and method of producing the same. According to the method a raw-material of colored recycled textile fibers is provided and dissolved in an ionic liquid to provide a spinning dope. By spinning the dope using dry jet-wet spinning colored respun textile fibers can be manufactured. The invention provides for the simultaneous recycling of cellulose fibers and dyes from dyed cotton waste in the form of dyed lyocell fibers.Type: ApplicationFiled: September 17, 2020Publication date: December 1, 2022Inventors: Simone Haslinger, Yingfeng Wang, Eugenia Smirnova, Michael Hummel, Herbert Sixta, Marja Rissanen
-
Patent number: 11486094Abstract: According to an example aspect of the present invention, there is provided a process for the conversion of cellulosic waste material into a recycled cellulose product comprising the steps of cooking the waste material in a cooking liquor to remove lignin from the waste material and provide a delignified pulp, dissolving the delignified pulp in an ionic liquid to provide a spinning dope suitable for dry jet-wet spinning in an ionic liquid solution, and subjecting the spinning dope to a further processing step to provide a recycled cellulose product, said further step selected from the group of spinning cellulose fibers for use in textiles from the solution, extruding a film product for use in packaging, regenerating the dope as a hydrogel and regenerating the dope as an aerogel.Type: GrantFiled: February 1, 2018Date of Patent: November 1, 2022Assignee: Aalto University Foundation srInventors: Herbert Sixta, Yibo Ma, Michael Hummel
-
Patent number: 11168196Abstract: According to an example aspect of the present invention, there is provided a method of separating cellulose and polyester from a material comprising a blend of cellulose and polyester, said method comprising the steps of mixing the material comprising a blend of cellulose and polyester with a first portion of superbase-based ionic liquid to dissolve a first portion of cellulose and form a first cellulose solution and a first residue comprising polyester, removing the first residue comprising polyester from the first cellulose solution, and directing the first cellulose solution to one or more further processing steps.Type: GrantFiled: December 20, 2017Date of Patent: November 9, 2021Assignee: Aalto University Foundation srInventors: Simone Haslinger, Michael Hummel, Herbert Sixta
-
Patent number: 10648129Abstract: The invention relates to a process for producing a dissolving pulp from a cellulosic starting material using the kraft process, comprising the step of cooking the starting material with a cooking liquor. The process according to the invention characterized in that the starting material is exposed to a steam treatment prior to cooking and that the pulp obtained by cooking is subjected to cold caustic extraction (CCE) in the course of further processing.Type: GrantFiled: December 28, 2017Date of Patent: May 12, 2020Assignee: Lenzing AktiengesellschaftInventors: Herbert Sixta, Andrea Promberger, Andrea Borgards, Roland Möslinger
-
Publication number: 20200079925Abstract: According to an example aspect of the present invention, there is provided a method of separating cellulose and polyester from a material comprising a blend of cellulose and polyester, said method comprising the steps of mixing the material comprising a blend of cellulose and polyester with a first portion of superbase-based ionic liquid to dissolve a first portion of cellulose and form a first cellulose solution and a first residue comprising polyester, removing the first residue comprising polyester from the first cellulose solution, and directing the first cellulose solution to one or more further processing steps.Type: ApplicationFiled: December 20, 2017Publication date: March 12, 2020Inventors: Simone Haslinger, Michael Hummel, Herbert Sixta
-
Publication number: 20200002848Abstract: According to an example aspect of the present invention, there is provided A process for making a cellulose fibre or film comprising the steps of dissolving pulp in an ionic liquid containing a cationic 1,5,7-triazabicyclo[4.4.0]dec-5-enium [TBDH]+ moiety and an anion selected from the group according to Formula a), Formula b) and Formula c), wherein each of R, R2, R3, R4, R5, R7, R8, R9 and R10 is H or an organyl radical and X? is selected from the group consisting of halides, pseudohalides, carboxylates, alkyl sulphite, alkyl sulphate, dialkylphosphite, dialkyl phosphate, dialkyl phosphonites and dialkyl phosphonates, to provide a spinning dope, extruding the spinning dope through a spinneret to form one or more filaments, and a step selected from the group consisting of spinning cellulose fibres from the solution, and extruding a cellulose film from the solution.Type: ApplicationFiled: January 30, 2018Publication date: January 2, 2020Inventors: Herbert Sixta, Michael Hummel, Kadvaël Le Boulch, Ilkka Kilpeläinen, Alistair W.T. King, Jussi Helminen, Sanna Hellsten
-
Publication number: 20190376236Abstract: According to an example aspect of the present invention, there is provided a process for the conversion of cellulosic waste material into a recycled cellulose product comprising the steps of cooking the waste material in a cooking liquor to remove lignin from the waste material and provide a delignified pulp, dissolving the delignified pulp in an ionic liquid to provide a spinning dope suitable for dry jet-wet spinning in an ionic liquid solution, and subjecting the spinning dope to a further processing step to provide a recycled cellulose product, said further step selected from the group of spinning cellulose fibers for use in textiles from the solution, extruding a film product for use in packaging, regenerating the dope as a hydrogel and regenerating the dope as an aerogel.Type: ApplicationFiled: February 1, 2018Publication date: December 12, 2019Inventors: Herbert Sixta, Yibo Ma, Michael Hummel
-
Publication number: 20190153625Abstract: A method of manufacturing a cellulose-based shaped article. The method comprises subjecting a solution of lignocellulosic material, dissolved in a distillable ionic liquid, to a spinning method, wherein the ionic liquid is a diazabicyclononene (DBN)-based ionic liquid. DBN-based ionic liquids have good dissolution power, high thermal and chemical stability, lack runaway reactions and exhibit low energy consumption, due to low spinning temperatures. The shaped cellulose articles can be used as textile fibres, high-end non-woven fibres, technical fibres, films for packaging, and barriers films in batteries, as membranes and as carbon-fibre precursors.Type: ApplicationFiled: January 30, 2019Publication date: May 23, 2019Inventors: Anne Michud, Alistair W.T. King, Arno Parviainen, Herbert Sixta, Lauri Hauru, Michael Hummel, Ilkka Kilpeläinen
-
Patent number: 10240259Abstract: A method of manufacturing a cellulose-based shaped article. The method comprises subjecting a solution of lignocellulosic material, dissolved in a distillable ionic liquid, to a spinning method, wherein the ionic liquid is a diazabicyclononene (DBN)-based ionic liquid. DBN-based ionic liquids have good dissolution power, high thermal and chemical stability, lack runaway reactions and exhibit low energy consumption, due to low spinning temperatures. The shaped cellulose articles can be used as textile fibers, high-end non-woven fibers, technical fibers, films for packaging, and barriers films in batteries, as membranes and as carbon-fiber precursors.Type: GrantFiled: April 4, 2014Date of Patent: March 26, 2019Assignees: Aalto University Foundation sr, Helsingin YliopistoInventors: Anne Michud, Alistair W. T. King, Arno Parviainen, Herbert Sixta, Lauri Hauru, Michael Hummel, Iikka Kilpeläinen
-
Publication number: 20180119345Abstract: The invention relates to a process for producing a dissolving pulp from a cellulosic starting material using the kraft process, comprising the step of cooking the starting material with a cooking liquor. The process according to the invention characterized in that the starting material is exposed to a steam treatment prior to cooking and that the pulp obtained by cooking is subjected to cold caustic extraction (CCE) in the course of further processing.Type: ApplicationFiled: December 28, 2017Publication date: May 3, 2018Inventors: Herbert Sixta, Andrea Promberger, Andrea Borgards, Roland Möslinger
-
Publication number: 20160053407Abstract: A method of manufacturing a cellulose-based shaped article. The method comprises subjecting a solution of lignocellulosic material, dissolved in a distillable ionic liquid, to a spinning method, wherein the ionic liquid is a diazabicyclononene (DBN)-based ionic liquid. DBN-based ionic liquids have good dissolution power, high thermal and chemical stability, lack runaway reactions and exhibit low energy consumption, due to low spinning temperatures. The shaped cellulose articles can be used as textile fibres, high-end non-woven fibres, technical fibres, films for packaging, and barriers films in batteries, as membranes and as carbon-fibre precursors.Type: ApplicationFiled: April 4, 2014Publication date: February 25, 2016Inventors: Anne Michud, Alistair W.T. King, Arno Parviainen, Herbert Sixta, Lauri Hauru, Michael Hummel, IIkka Kilpeläinen
-
Publication number: 20150107790Abstract: A method of separating hemicellulose and cellulose by dissolution of hemicellulose from a hemicellulose-rich source, such as a pulp of any origin or from holocellulose. In the method, hemicellulose is dissolved in a solvent system comprising a cellulose solvent, which is either a ionic liquid or another direct cellulose solvent, and a molecular solvent (co-solvent), wherein said co-solvent does not dissolve cellulose, and wherein the solvent basicity and acidity of said ionic liquid or other direct cellulose solvent are adequately adjusted by the co-solvent. The present invention enables quantitative separation of cellulose and hemicellulose without any depolymerization and yield losses as occurring during conventional dissolving pulp manufacturing processes.Type: ApplicationFiled: April 15, 2013Publication date: April 23, 2015Applicant: METSA FIBRE OYInventors: Herbert Sixta, Michael Hummel, Mikhail Iakovlev, Lasse Tolonen
-
Patent number: 8785688Abstract: In a process for recovering acetic acid from a wood extract, an aqueous wood extract is provided that contains acetic acid and dissolved hemicellulose containing uronic acid. A water insoluble solvent containing an extractant for the acetic acid is also provided. In a preferred embodiment, the solvent is undecane and the extractant is trioctylphosphine oxide. The wood extract is contacted with the solvent and extractant in order to extract the acetic acid from the wood extract. The acetic acid is then recovered from the solvent and extractant.Type: GrantFiled: October 31, 2008Date of Patent: July 22, 2014Assignee: University of Maine System Board of TrusteesInventors: Adriaan van Heiningen, Herbert Sixta, Byung-Hwan Um, Peter van Walsum
-
Publication number: 20130296545Abstract: The invention relates to a process for producing a dissolving pulp from a cellulosic starting material using the kraft process, comprising the step of cooking the starting material with a cooking liquor. The process according to the invention characterized in that the starting material is exposed to a steam treatment prior to cooking and that the pulp obtained by cooking is subjected to cold caustic extraction (CCE) in the course of further processing.Type: ApplicationFiled: June 28, 2013Publication date: November 7, 2013Inventors: Herbert Sixta, Andrea Promberger, Andrea Borgards, Ronald Möslinger
-
Patent number: 8500956Abstract: The invention relates to a process for producing a dissolving pulp from a cellulosic starting material using the kraft process, comprising the step of cooking the starting material with a cooking liquor. The process according to the invention characterized in that the starting material is exposed to a steam treatment prior to cooking and that the pulp obtained by cooking is subjected to cold caustic extraction (CCE) in the course of further processing.Type: GrantFiled: May 9, 2007Date of Patent: August 6, 2013Assignee: Lenzing AktiengesellschaftInventors: Herbert Sixta, Andrea Promberger, Andrea Borgards, Roland Möslinger
-
Publication number: 20110263895Abstract: In a process for recovering acetic acid from a wood extract, an aqueous wood extract is provided that contains acetic acid and dissolved hemicellulose containing uronic acid. A water insoluble solvent containing an extractant for the acetic acid is also provided. In a preferred embodiment, the solvent is undecane and the extractant is trioctylphosphine oxide. The wood extract is contacted with the solvent and extractant in order to extract the acetic acid from the wood extract. The acetic acid is then recovered from the solvent and extractant.Type: ApplicationFiled: October 31, 2008Publication date: October 27, 2011Inventors: Adriaan Van Heiningen, Herbert Sixta, Byung-Hwan Um, Peter Van Walsum
-
Publication number: 20100021975Abstract: The invention relates to a process for producing xylo-oligosaccharides, comprising the steps of cold caustic extraction (CCE) of a pulp obtained by a cooking process; purifying at least a portion of the press liquor forming in the cold caustic extraction stage using a membrane separation process, preferably nano- or ultrafiltration; obtaining the xylans from at least a portion of the retentate of the membrane separation process; processing at least a portion of the xylans obtained into xylo-oligosaccharides.Type: ApplicationFiled: May 9, 2007Publication date: January 28, 2010Applicant: LENZING AKTIENGESELLSCHAFTInventors: Herbert Sixta, Roland Möslinger, Thomas Lange
-
Publication number: 20090312536Abstract: The invention relates to a process for producing a dissolving pulp from a cellulosic starting material using the kraft process, comprising the step of cooking the starting material with a cooking liquor. The process according to the invention characterized in that the starting material is exposed to a steam treatment prior to cooking and that the pulp obtained by cooking is subjected to cold caustic extraction (CCE) in the course of further processing.Type: ApplicationFiled: May 9, 2007Publication date: December 17, 2009Inventors: Herbert Sixta, Andrea Promberger, Andrea Borgards, Roland Moslinger