Patents by Inventor Axel Ronneburg

Axel Ronneburg 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).

  • Publication number: 20220227706
    Abstract: The present invention relates to a process for the preparation of methionine comprising the step of contacting a solution or suspension comprising 2-amino-4-(methylthio)butanenitrile and/or 2-amino-4-(methylthio)butaneamide with water in the presence of a catalyst to give a methionine comprising mixture, wherein the catalyst comprises CeO2 comprising particles, wherein the CeO2 comprising particles have a BET surface area of from 175 to 300+/?10% m2/g measured according to DIN ISO 9277-5 (2003), a mean maximum Feret diameter xFmax, mean of from 3+/?10% to 40+/?10% nm and a mean minimum Feret diameter xFmin, mean of from 2+/?10% to 30+/?10% nm, both measured according to DIN ISO 9276-6 (2012).
    Type: Application
    Filed: June 8, 2020
    Publication date: July 21, 2022
    Applicant: Evonik Operations GmbH
    Inventors: J├╝rgen BILZ, Cornelia BORGMANN, Achim FISCHER, Lucas GEIST, Anja NORDSCHILD, Christian RENNER, Christian REUS, Axel RONNEBURG
  • Publication number: 20220204435
    Abstract: The present invention pertains to a process for preparing 3-hydroxy-3-methylbutyrate (HMB) or a salt thereof, the method comprising (a) reacting isobutylene oxide with cyanide in order to obtain 3-hydroxy-3-methylbutyronitrile, and (b) hydrolyzing the 3-hydroxy-3-methylbutyronitrile obtained in step (a) in order to obtain HMB, wherein hydrolysis step (b) is performed using either at least one nitrilase enzyme or, alternatively, using a combination of enzymes, said combination comprising at least one nitrile hydratase and at least one amidase.
    Type: Application
    Filed: March 25, 2020
    Publication date: June 30, 2022
    Applicant: EVONIK OPERATIONS GMBH
    Inventors: Timo STAHL, Axel RONNEBURG, Imad MOUSSALLEM, Juliette HALLI, Petra PICHA
  • Publication number: 20220089533
    Abstract: The present invention relates to a process for the preparation of methionine comprising the step of contacting a solution or suspension comprising 2-amino-4-(methylthio)butanenitrile and/or 2-amino-4-(methylthio)butaneamide with water in the presence of a catalyst to give a methionine comprising mixture, wherein the catalyst comprises CeO2 comprising particles, wherein the CeO2 comprising particles comprise from 50 to 100 wt.-% of CeO2, have a BET surface area of from 35 to 65 m2/g measured according to DIN ISO 9277-5 (2003), a mean maximum Feret diameter xFmax, mean of from 10 to 40 nm and a mean minimum Feret diameter xFmin, mean of from 5 to 30 nm, both measured according to DIN ISO 9276-6 (2012).
    Type: Application
    Filed: February 3, 2020
    Publication date: March 24, 2022
    Applicant: Evonik Operations GmbH
    Inventors: Juergen BILZ, Cornelia BORGMANN, Achim FISCHER, Lucas GEIST, Anja NORDSCHILD, Christian RENNER, Christian REUS, Axel RONNEBURG
  • Patent number: 10844009
    Abstract: The present invention pertains to a process for preparing guanidino acetic acid (GAA) from cyanamide and glycine in alkaline process solution, in which anionic impurities are removed from the process solution by electrodialysis.
    Type: Grant
    Filed: December 31, 2019
    Date of Patent: November 24, 2020
    Assignee: Evonik Operations GmbH
    Inventors: Timo Stahl, Patrik Stenner, Cornelia Borgmann, Christian Renner, Axel Ronneburg
  • Publication number: 20200207707
    Abstract: The present invention pertains to a process for preparing guanidino acetic acid (GAA) from cyanamide and glycine in alkaline process solution, in which anionic impurities are removed from the process solution by electrodialysis.
    Type: Application
    Filed: December 31, 2019
    Publication date: July 2, 2020
    Inventors: Timo STAHL, Patrik STENNER, Cornelia BORGMANN, Christian RENNER, Axel RONNEBURG
  • Patent number: 8809576
    Abstract: The invention relates to an improved method for releasing an organic acid, preferably a carbon, sulfone or phosphone acid, particularly an alpha or beta hydroxycarbon acid, from the ammonia salt thereof by releasing and removing ammoniac and simultaneous extraction of the released acid, having an amine as a suitable extraction means from the aqueous phase. This method corresponds to a reactive extraction. The reactive extraction of an organic acid from the aqueous ammonia salt solution thereof can be significantly improved by the use of a strip medium or carrier gas, such as nitrogen, air, water vapor or inert gases such as argon. The released ammoniac is removed from the aqueous solution by the continuous gas flow and can be resupplied into a production process. The free acid can be obtained by a method such as distillation, rectification, crystallization, reextraction, chromatography, adsorption or by a membrane method from the extraction means.
    Type: Grant
    Filed: February 1, 2010
    Date of Patent: August 19, 2014
    Assignee: Evonik Degussa GmbH
    Inventors: Alexander Schraven, Thomas Tacke, Thomas Haas, Christoph Kobler, Dieter Buss, Axel Ronneburg, Olivier Zehnacker
  • Publication number: 20110257429
    Abstract: The invention relates to an improved method for releasing an organic acid, preferably a carbon, sulfone or phosphone acid, particularly an alpha or beta hydroxycarbon acid, from the ammonia salt thereof by releasing and removing ammoniac and simultaneous extraction of the released acid, having an amine as a suitable extraction means from the aqueous phase. This method corresponds to a reactive extraction. The reactive extraction of an organic acid from the aqueous ammonia salt solution thereof can be significantly improved by the use of a strip medium or carrier gas, such as nitrogen, air, water vapor or inert gases such as argon. The released ammoniac is removed from the aqueous solution by the continuous gas flow and can be resupplied into a production process. The free acid can be obtained by a method such as distillation, rectification, crystallization, reextraction, chromatography, adsorption or by a membrane method from the extraction means.
    Type: Application
    Filed: February 1, 2010
    Publication date: October 20, 2011
    Applicant: Evonik Degussa GmbH
    Inventors: Alexander Schraven, Thomas Tacke, Thomas Haas, Christoph Kobler, Dieter Buss, Axel Ronneburg, Olivier Zehnacker
  • Publication number: 20100210871
    Abstract: The invention relates to a process for converting ammonium salts of organic acids to the particular free organic acid, wherein an aqueous solution of the ammonium salt is contacted with an organic extractant and the salt is dissociated at temperatures and pressures at which the aqueous solution and the extractant are in the liquid state, and a stripping medium or entraining gas is introduced in order to remove NH3 from the aqueous solution and transfer at least a portion of the free organic acid formed to the organic extractant. The invention described here thus provides an improved process for releasing an organic acid, preferably a carboxylic, sulphonic or phosphonic acid, especially an alpha-hydroxycarboxylic acid or beta-hydroxycarboxylic acid, from the ammonium salt thereof by release and removal of ammonia and simultaneous extraction of the acid released with a suitable extractant from the aqueous phase. This process corresponds to a reactive extraction.
    Type: Application
    Filed: February 16, 2010
    Publication date: August 19, 2010
    Applicant: EVONIK DEGUSSA GMBH
    Inventors: Christoph Kobler, Dieter Buss, Axel Ronneburg, Christoph Weckbecker
  • Patent number: 7670986
    Abstract: A manganese dioxide catalyst for hydrolysing organic nitrites which bear readily oxidizable groups such as thiol or thioether groups to the corresponding carboxamides, and to a process for preparing the catalyst and to its use for hydrolysing organic nitrites.
    Type: Grant
    Filed: October 5, 2006
    Date of Patent: March 2, 2010
    Assignee: Degussa AG
    Inventors: Horst Weigel, Axel Ronneburg, Christoph Weckbecker
  • Publication number: 20070117980
    Abstract: A manganese dioxide catalyst for hydrolysing organic nitrites which bear readily oxidizable groups such as thiol or thioether groups to the corresponding carboxamides, and to a process for preparing the catalyst and to its use for hydrolysing organic nitrites.
    Type: Application
    Filed: October 5, 2006
    Publication date: May 24, 2007
    Inventors: Horst Weigel, Axel Ronneburg, Christoph Weckbecker
  • Patent number: 6008409
    Abstract: A method for obtaining 2-hydroxy-4-methylthiobutyric acid (methionine-hydroxy analog, MHA) in primarily free form which is stable in storage by distilling a product solution containing MHA and by producing MHA product mixtures with improved storage stability from such a distillate. The distillate can be produced directly starting from MHA raw products from any MHA production process, which can optionally also contain solvent or water. The starting material may also be a commercial MHA product.
    Type: Grant
    Filed: December 29, 1997
    Date of Patent: December 28, 1999
    Assignee: Degussa Aktiengesellschaft
    Inventors: Hans-Albrechl Hasseberg, Hans-Joachim Hasselbach, Klaus Huthmacher, Volker Hafner, Harald Heinzel, Axel Ronneburg