Patents by Inventor Sven-Peter Mannsfeld

Sven-Peter Mannsfeld 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).

  • Process for the preparation of D,L-methionine or the salt thereof
    Patent number: 5990349
    Abstract: A process for the preparation of methionine or a salt of methionine by reaction of the components 3-methylmercaptopropionaldhyde, hydrogen cyanide, ammonia and carbon dioxide or components from which the above-mentioned components can be prepared, optionally in the presence of water, to 5-(2-methylmercaptoethyl)-hydantoin and further reaction thereof to methionine or the salt thereof, characterised in that the reaction of the components is initiated by means of at least one premixture in such a way that a first mixture is formed containing at least the predominant proportion (at least 5/10) of the 3-methylmercaptopropionaldeyde and at least 1/10 of the hydrogen cyanide component or corresponding quantities of components from which these components can be prepared, and less than 5/10 of one of the components ammonia, carbon dioxide or of the components from which ammonia or carbon dioxide can be prepared, and in that this first mixture is combined with the other component(s) for the reactive conversion to 5-(2
    Type: Grant
    Filed: March 9, 1998
    Date of Patent: November 23, 1999
    Assignee: Degussa Aktiengesellschaft
    Inventors: Friedhelm Geiger, Baudouin Halsberghe, Hans-Joachim Hasselbach, Klaus Hentschel, Klaus Huthmacher, Martin Korfer, Sven-Peter Mannsfeld, Herbert Tanner, Ferdinand Theissen, Jose Vanrobaeys, Klaus Willigerodt
  • Process for the preparation of D,L-methionine or the salt thereof
    Patent number: 5770769
    Abstract: A process for the preparation of methionine or a salt of methionine by reaction of the components 3-methylmercaptopropionaldhyde, hydrogen cyanide, ammonia and carbon dioxide or components from which the above-mentioned components can be prepared, optionally in the presence of water, to 5-(2-methylmercaptoethyl)-hydantoin and further reaction thereof to methionine or the salt thereof, characterised in that the reaction of the components is initiated by means of at least one premixture in such a way that a first mixture is formed containing at least the predominant proportion (at least 5/10) of the 3-methylmercaptopropionaldeyde and at least 1/10 of the hydrogen cyanide component or corresponding quantities of components from which these components can be prepared, and less than 5/10 of one of the components ammonia, carbon dioxide or of the components from which ammonia or carbon dioxide can be prepared, and in that this first mixture is combined with the other component(s) for the reactive conversion to 5-(2
    Type: Grant
    Filed: December 18, 1996
    Date of Patent: June 23, 1998
    Assignee: Degussa Aktiengesellschaft
    Inventors: Friedhelm Geiger, Baudouin Halsberghe, Hans-Joachim Hasselbach, Klaus Hentschel, Klaus Huthmacher, Martin Korfer, Sven-Peter Mannsfeld, Herbert Tanner, Ferdinand Theissen, Jose Vanrobaeys, Klaus Willigerodt
  • Continuous process for the manufacture of methionine
    Patent number: 4069251
    Abstract: In a continuous process 5-(.beta.-methylmercaptoethyl)-hydantoin is subjected to hydrolysis at an elevated temperature and elevated pressure in an aqueous solution of alkali carbonate or alkali bicarbonate or a mixture of these two compounds. The ammonia and carbon dioxide which form during the hydrolysis are removed and when the hydrolysis is complete the methionine is separated by means of carbon dioxide and the mother liquor is recirculated into the process after replenishing with fresh amounts of said hydantoin.
    Type: Grant
    Filed: August 12, 1976
    Date of Patent: January 17, 1978
    Assignee: Deutsche Gold- und Silber-Scheideanstalt vormals Roessler
    Inventors: Sven Peter Mannsfeld, Arno Pfeiffer, Herbert Tanner, Hans Wagner, Erich Liebetanz, deceased
  • Process for the stabilization of methionine
    Patent number: 3931307
    Abstract: Methionine is stabilized by adjusting the pH to the range from 3 to <5. The source of the hydantoin is preferably 5-(beta-methylmercaptoethyl)-hydantoin.
    Type: Grant
    Filed: November 30, 1973
    Date of Patent: January 6, 1976
    Assignee: Deutsche Gold- und Silber-Scheideanstalt vormals Roessler
    Inventors: Gerd Eikelmann, Rudolf Fahnenstich, Theodor Lussling, Sven-Peter Mannsfeld, Gerhard Pohl, Herbert Tanner, Hans Wagner