Patents by Inventor Lars Stigsson

Lars Stigsson 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).

  • Patent number: 10988707
    Abstract: The present invention describes a method for the treatment of tall oil pitch (TOP), said method comprising heating the TOP and optionally additives including water and steam to a temperature of at least 300° C.; maintaining the temperature in the reactor at 300° C. or higher for a period of time to enable thermal treatment of the TOP to act on components thereof to produce fatty acids and/or rosin acids, and/or derivatives thereof, and/or unsaponifiables and/or derivatives having lower molecular weight compared to the high molecular weight components with molecular weights of at least 350 g/mole present in the original TOP, to yield a modified TOP material with lower viscosity.
    Type: Grant
    Filed: November 20, 2018
    Date of Patent: April 27, 2021
    Assignee: SUNPINE AB
    Inventors: Lars Stigsson, Valeri Naydenov, Christian Hulteberg
  • Publication number: 20200347319
    Abstract: The present invention describes a method for the treatment of tall oil pitch (TOP), said method comprising heating the TOP and optionally additives including water and steam to a temperature of at least 300° C.; maintaining the temperature in the reactor at 300° C. or higher for a period of time to enable thermal treatment of the TOP to act on components thereof to produce fatty acids and/or rosin acids, and/or derivatives thereof, and/or unsaponifiables and/or derivatives having lower molecular weight compared to the high molecular weight components with molecular weights of at least 350 g/mole present in the original TOP, to yield a modified TOP material with lower viscosity.
    Type: Application
    Filed: November 20, 2018
    Publication date: November 5, 2020
    Inventors: Lars STIGSSON, Valeri NAYDENOV, Christian HULTEBERG
  • Publication number: 20200299416
    Abstract: The present invention is directed to a cellulosic fibre composition comprising regenerated cellulose and one or more additives, wherein a) the cellulosic fibre composition is produced by injecting an aqueous alkaline spindope solution or suspension comprising dissolved cellulose in a concentration from about 5% to about 12% by weight of spindope and at least one of an additive and a nano-sized structured particulate filler through a nozzle into an alkaline coagulation bath forming cellulosic filaments; and b) stretching or washing cellulosic filaments from a) in one or more stretching and washing baths forming a regenerated cellulosic fibre.
    Type: Application
    Filed: March 15, 2018
    Publication date: September 24, 2020
    Inventor: Lars STIGSSON
  • Publication number: 20200291314
    Abstract: The present invention is directed to a process for the production of a syngas suited for further conversion to fine chemicals and/or automotive fuels from biomass by a thermochemical process conducted in a several steps procedure, said process comprising; a) Providing a stream of biomass material; b) Providing an aqueous alkaline catalyst stream comprising sodium and/or potassium compounds; c) Mixing comminuted biomass and alkaline catalyst and optional additives to form an alkaline biomass slurry or suspension; d) Treating alkaline biomass slurry or suspension in a hydrothermal treatment reactor at a temperature in the range of 200-400° C.
    Type: Application
    Filed: November 6, 2018
    Publication date: September 17, 2020
    Inventors: Erik FURUSJÖ, Kentaro UMEKI, Rikard GEBART, Lars STIGSSON
  • Publication number: 20200141057
    Abstract: A process for depolymerization of lignin, the process including using at least one catalyst internal to a pulp mill for performing catalytic treatment and separation of biomass components into cellulose and lignin rich material is provided.
    Type: Application
    Filed: June 5, 2018
    Publication date: May 7, 2020
    Inventors: Christian Hulteberg, Lars Stigsson
  • Patent number: 10138578
    Abstract: The present invention concerns a method for the recovery of solvent in a process for preparation of regenerated cellulosic fibers using sodium hydroxide as solvent for cellulose dissolving in the manufacturing of a cellulose spinning dope wherein sodium hydroxide present in the spinning dope is at least partially recovered and recycled as sodium hydroxide from a cellulose fiber regeneration or cellulose coagulation step and wherein said cellulose fiber regeneration or cellulose coagulation step consists of a bath into which cellulose spinning dope is injected. Recovered sodium hydroxide may be directly or indirectly recycled from a cellulose fiber regeneration or cellulose coagulation step to a cellulose dissolving step.
    Type: Grant
    Filed: June 27, 2014
    Date of Patent: November 27, 2018
    Assignee: TREETOTEXTILE AB
    Inventors: Lars Stigsson, Bengt Hagström, Tobias Köhnke, Artur Hedlund, Marta Bialik
  • Patent number: 9719047
    Abstract: The present invention pertains to a process for refining of crude tall oil (CTO). The process comprises fractionation under vacuum of a refined CTO into at least one stream of refined tall diesel (RTD) or tall oil fatty acids (TOFA), the RTD or TOFA comprises from 2-30% by volume of resin acids and from 20-90% by volume of fatty acids, and at least one stream of resin acid(s) (RA) comprising less than 5% by volume of fatty acids. The stream of RTD or TOFA is deoxygenated forming hydrocarbon compounds in a subsequent step. This invention also relates to a refined tall diesel. Furthermore, a process for the production of a refined tall diesel (RTD) composition, wherein crude sulphate turpentine(s) (CST) is added to the refined tall diesel (RTD) composition, is described.
    Type: Grant
    Filed: December 20, 2013
    Date of Patent: August 1, 2017
    Assignee: Sunpine AB
    Inventors: Lars Stigsson, Valeri Naydenov, Johan Lundback
  • Patent number: 9499767
    Abstract: A process for pre-treatment of a crude tall oil (CTO) for removal of impurities is disclosed. The process comprises a first pre-treatment step involving a CTO wash and a separation of a first oil phase comprising refined CTO and an aqueous phase holding impurities, and a second step involving a separation of a second oil phase from the aqueous phase. A process for refining of crude tall oil (CTO) is also disclosed. The process comprises fractionation under vacuum of a refined CTO into at least one stream of refined tall diesel (RTD) or tall oil fatty acids (TOFA) and at least one stream of resin acid(s) (RA). The stream of RTD or TOFA is deoxygenated forming hydrocarbon compounds in a subsequent step. This invention also relates to a refined tall diesel. Furthermore, a process for the production of a refined tall diesel (RTD) composition, wherein crude sulphate turpentine(s) (CST) is added to the refined tall diesel (RTD) composition, is described.
    Type: Grant
    Filed: December 21, 2012
    Date of Patent: November 22, 2016
    Assignee: Sunpine AB
    Inventors: Lars Stigsson, Valeri Naydenov, Johan Lundback
  • Publication number: 20160138200
    Abstract: The present invention concerns a method for the recovery of solvent in a process for preparation of regenerated cellulosic fibers using sodium hydroxide as solvent for cellulose dissolving in the manufacturing of a cellulose spinning dope wherein sodium hydroxide present in the spinning dope is at least partially recovered and recycled as sodium hydroxide from a cellulose fiber regeneration or cellulose coagulation step and wherein said cellulose fiber regeneration or cellulose coagulation step consists of a bath into which cellulose spinning dope is injected. Recovered sodium hydroxide may be directly or indirectly recycled from a cellulose fiber regeneration or cellulose coagulation step to a cellulose dissolving step.
    Type: Application
    Filed: June 27, 2014
    Publication date: May 19, 2016
    Inventors: Lars Stigsson, Bengt Hagström, Tobias Köhnke, Artur Hedlund, Marta Bialik
  • Publication number: 20160130752
    Abstract: The present invention describes a method for the treatment of spent pulping liquor for the removal and production of organic substances rich in lignin and recovering or recycling of aqueous cooking chemicals to pulp mill chemicals recovery cycle, said method comprising passing a spent pulping liquor flow from a digester or an evaporator, DF or from any other step in between the digester and the evaporator, through a filtration step in which the flow is separated into one aqueous stream comprising cooking chemicals being recovered or recycled and one stream concentrated with the respect of organic substances; passing the stream concentrated with respect of organic substances either to a lignin depolymerisation step for the production of liquid and pumpable depolymerised lignin or passing the stream concentrated with respect to organic substances to a subsequent filtration step in which an aqueous solution is added and further treatments in order to produce a solid lignin containing product.
    Type: Application
    Filed: May 9, 2014
    Publication date: May 12, 2016
    Inventors: Lars STIGSSON, Anders ARKELL, Johanna OLSSON
  • Patent number: 9221869
    Abstract: There is disclosed a method for isolation and purification of phytosterols from tall oil pitch comprising the steps of: a) contacting the tall oil pitch with a solvent to form a tall oil solvent mixture; b) separating the tall oil pitch solvent mixture in at least two separate streams wherein one process stream is enriched in acidic pitch components and a second stream enriched in free- and bound sterols in the form of steryl esters; c) subjecting the stream enriched in free- and steryl esters to treatment with an alcohol under transesterification conditions wherein a reaction mixture is formed and sterols comprising the steryl esters are liberated as free sterols; and d) separating the free sterols from the reaction mixture of step c) by crystallization and extraction with one or more solvents. There are disclosed free fatty acids and resin acids separated from the tall oil pitch. Moreover, there is disclosed a manufacture and separation of fatty acid alkyl esters by the method.
    Type: Grant
    Filed: February 10, 2009
    Date of Patent: December 29, 2015
    Assignee: SUNPINE AB
    Inventors: Lars Stigsson, Valeri Naydenov
  • Publication number: 20150353866
    Abstract: The present invention pertains to a process for refining of crude tall oil (CTO). The process comprises fractionation under vacuum of a refined CTO into at least one stream of refined tall diesel (RTD) or tall oil fatty acids (TOFA), the RTD or TOFA comprises from 2-30% by volume of resin acids and from 20-90% by volume of fatty acids, and at least one stream of resin acid(s) (RA) comprising less than 5% by volume of fatty acids. The stream of RTD or TOFA is deoxygenated forming hydrocarbon compounds in a subsequent step. This invention also relates to a refined tall diesel. Furthermore, a process for the production of a refined tall diesel (RTD) composition, wherein crude sulphate turpentine(s) (CST) is added to the refined tall diesel (RTD) composition, is described.
    Type: Application
    Filed: December 20, 2013
    Publication date: December 10, 2015
    Inventors: Lars Stigsson, Valeri NAYDENOV, Johan LUNDBÄCK
  • Publication number: 20150307810
    Abstract: A process for pre-treatment of a crude tall oil (CTO) for removal of impurities is disclosed. The process comprises a first pre-treatment step involving a CTO wash and a separation of a first oil phase comprising refined CTO and an aqueous phase holding impurities, and a second step involving a separation of a second oil phase from the aqueous phase. A process for refining of crude tall oil (CTO) is also disclosed. The process comprises fractionation under vacuum of a refined CTO into at least one stream of refined tall diesel (RTD) or tall oil fatty acids (TOFA) and at least one stream of resin acid(s) (RA). The stream of RTD or TOFA is deoxygenated forming hydrocarbon compounds in a subsequent step. This invention also relates to a refined tall diesel. Furthermore, a process for the production of a refined tall diesel (RTD) composition, wherein crude sulphate turpentine(s) (CST) is added to the refined tall diesel (RTD) composition, is described.
    Type: Application
    Filed: December 21, 2012
    Publication date: October 29, 2015
    Inventors: Lars Stigsson, Valeri Naydenov, Johan Lundback
  • Patent number: 8735637
    Abstract: A method for converting crude tall oil into high quality diesel fuels include the steps of (a) removal of non-oil contaminants present in the crude tall oil and recovery of valuable organic, (b) heating and removing the volatile fractions of the refined tall oil stream from step (a) and forming a volatiles free oil stream comprising organic components with boiling points of 170° C. and higher, (c) vacuum distilling the volatiles free oil stream of from step (b) to produce a first and second stream the first stream including components with boiling points between 170-400° C. and the second stream comprising components having boiling points greater than 400° C. and (d) passing the first stream into a catalytic reactor wherein hydrogenation and deoxygenation take place to produce a diesel range fuel depleted in oxygen.
    Type: Grant
    Filed: March 31, 2009
    Date of Patent: May 27, 2014
    Assignee: Sunpine AB
    Inventors: Lars Stigsson, Valeri Naydenov
  • Patent number: 8617354
    Abstract: Provided is a process for manufacturing shaped cellulose materials from lignocellulose where a dissolving grade pulp is manufactured and dissolved in an aqueous alkaline or acidic solvent system forming a solution suitable for shaping new cellulose structures including fibers, films and cellulose derivatives. At least a part of the spent cellulose dissolving or cellulose shaping chemicals are recovered in one or more unit operations in a pulp mill chemical recovery cycle.
    Type: Grant
    Filed: March 8, 2010
    Date of Patent: December 31, 2013
    Assignee: Kiram AB
    Inventor: Lars Stigsson
  • Patent number: 8252141
    Abstract: Disclosed herein is a method for recovering a low sodium content lignin from spent kraft cooking liquor without the use a of strong mineral acid for acidulation.
    Type: Grant
    Filed: December 17, 2007
    Date of Patent: August 28, 2012
    Assignee: Andritz Oy
    Inventors: Lars Stigsson, Curt Lindstrom
  • Publication number: 20120000621
    Abstract: Provided is a process for manufacturing shaped cellulose materials from lignocellulose where a dissolving grade pulp is manufactured and dissolved in an aqueous alkaline or acidic solvent system forming a solution suitable for shaping new cellulose structures including fibers, films and cellulose derivatives. At least a part of the spent cellulose dissolving or cellulose shaping chemicals are recovered in one or more unit operations in a pulp mill chemical recovery cycle.
    Type: Application
    Filed: March 8, 2010
    Publication date: January 5, 2012
    Applicant: KIRAM AB
    Inventor: Lars Stigsson
  • Publication number: 20110082307
    Abstract: There is disclosed a method for isolation and purification of phytosterols from tall oil pitch comprising the steps of: a) contacting the tall oil pitch with a solvent to form a tall oil solvent mixture; b) separating the tall oil pitch solvent mixture in at least two separate streams wherein one process stream is enriched in acidic pitch components and a second stream enriched in free- and bound sterols in the form of steryl esters; c) subjecting the stream enriched in free- and steryl esters to treatment with an alcohol under transesterification conditions wherein a reaction mixture is formed and sterols comprising the steryl esters are liberated as free sterols; and d) separating the free sterols from the reaction mixture of step c) by crystallization and extraction with one or more solvents. There are disclosed free fatty acids and resin acids separated from the tall oil pitch. Moreover, there is disclosed a manufacture and separation of fatty acid alkyl esters by the method.
    Type: Application
    Filed: February 10, 2009
    Publication date: April 7, 2011
    Inventors: Lars Stigsson, Valeri Naydenov
  • Publication number: 20110049012
    Abstract: There is disclosed a method for conversion of crude tall oil into high-quality diesel fuels comprising the steps of: (a) removal of non-oil contaminants present in the crude tall oil and recovering valuable organic compounds present in the crude tall oil, thereby forming a refined tall oil stream; (b) removal of the volatile fraction of the refined tall oil stream from step a), thereby forming a volatiles free oil stream comprising organic components with boiling points, at atmospheric pressure, of 170 degrees C. or higher; (c) separation in a vacuum distillation column of the volatiles free oil stream of step b) into two process streams or phases wherein a first process stream or phase is substantially comprising components with boiling points, at atmospheric pressure, in the range of 170-400 degrees C. and a second process stream or phase is substantially comprising components with boiling points, at atmospheric pressure, over 400 degrees C.
    Type: Application
    Filed: March 31, 2009
    Publication date: March 3, 2011
    Inventors: Lars Stigsson, Valeri Naydenov
  • Publication number: 20100041879
    Abstract: There is disclosed a method for recovering a low sodium content lignin from spent kraft cooking liquor without the use a of strong mineral acid for acidulation comprising the steps of acidulating a spent kraft cooking liquor with carbon dioxide gas to a pH below about 10.5, precipitating at least a portion of the lignin forming lignin agglomerates and lignin particles in the spent kraft cooking liquor and recovering a low water and low sodium content lignin product comprising calcium or magnesium compounds bound to said lignin.
    Type: Application
    Filed: December 17, 2007
    Publication date: February 18, 2010
    Inventors: Lars Stigsson, Curt Lindstrom