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    A PROCESS FOR THE PREPARATION OF D,L-METHIONINE OR THE SALT THEREOF
    41.
    发明专利
    A PROCESS FOR THE PREPARATION OF D,L-METHIONINE OR THE SALT THEREOF 未知

    公开(公告)号：CA2193161A1

    公开(公告)日：1997-06-19

    申请号：CA2193161

    申请日：1996-12-17

    Applicant: DEGUSSA

    Inventor： GEIGER FRIEDHELM ,  HALSBERGHE BAUDOUIN ,  HASSELBACH HANS-JOACHIM ,  HENTSCHEL KLAUS ,  HUTHMACHER KLAUS ,  KOERFER MARTIN ,  MANNSFELD SVEN-PETER ,  TANNER HERBERT ,  THEISSEN FERDINAND ,  VANROBAEYS JOSE ,  WILLIGERODT KLAUS

    IPC: C07C319/20 ,  C07C319/28 ,  C07C323/58 ,  C07D233/76

    Abstract: A process for the preparation of methionine or a salt of methionine by reaction of the components 3methylmercaptopropionaldhyde, hydrogen cyanide, ammonia and carbon dioxide or components from which the abovementioned 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-methylmercaptoethyl)-hydantoin, wherein this (these) latter component(s) may be premixed in one or more other mixtures.

    43.
    发明专利
    未知

    公开(公告)号：IT1154279B

    公开(公告)日：1987-01-21

    申请号：IT4775682

    申请日：1982-02-10

    Applicant: DEGUSSA

    Inventor： SPINDLER MANFRED ,  TANNER HERBERT ,  GEIGER FRIEDHELM ,  BITTNER FRIEDRICH ,  MARTENS JUERGEN

    IPC: C07C319/20 ,  A23K1/16 ,  C07C67/00 ,  C07C313/00 ,  C07C323/58 ,  C07C

    Abstract: Aqueous sodium methioninate solutions having a low content of sodium carbonate can be recovered from the crude hydrolysis mixture resulting from the saponification of 5-( beta -methylmercaptoethyl)hydantoin with 1.1 to 6 equivalents of sodium hydroxide and/or sodium carbonate by cooling the crude hydrolysis mixture to a temperature below 10 DEG C., separating off the precipitated sodium carbonate and concentrating the sodium methioninate solution remaining to 40 to 65 weight percent.

    44.
    发明专利
    未知

    公开(公告)号：MX153484A

    公开(公告)日：1986-11-07

    申请号：MX17873479

    申请日：1979-08-01

    Applicant: DEGUSSA

    Inventor： BACH GERHARD ,  GEIGER FRIEDHELM ,  HEIMBERGER WERNER ,  SCHREYER GERD ,  HILLENBRAND HORST

    IPC: B01D53/68 ,  C01C3/00 ,  C07D251/28 ,  C07D251/32

    Abstract: The residual gases obtained in the production of cyanuric chloride having a pressure of 1-5 bar (absolute) preferably 1-4 bar, are worked up by leading them into the lower portion of a column, reacted in the column with at least the equivalent amount of hydrogen cyanide to form cyanogen chloride and led in countercurrent flow to the water charged to the upper portion of the column whereupon the aqueous solution of cyanogen chloride formed is withdrawn from the lower portion of the column and preferably is returned into the production portion of the plant for recovery of the cyanogen chloride while the purified waste gas of the column leaves in the upper portion of the column.

    50.
    发明专利
    未知

    公开(公告)号：RO64461A

    公开(公告)日：1980-06-15

    申请号：RO7434073

    申请日：1973-03-30

    Applicant: DEGUSSA

    Inventor： GEIGER FRIEDHELM ,  HEIMBERGER WERNER ,  SCHREYER GERD

    IPC: C01B7/00 ,  C01B7/01 ,  C01B7/02

    Abstract: Side reactions in the use of gaseous chlorine are avoided by leading the chlorine containing at least 0.0001% of non-volatile compounds such as ferric chloride over silica gel, glass wool, pumice or montmorillonite. Preferably the thus treated chlorine is passed through hexachlorobutadiene or perfluorokerosene in a second absorption step. Ferric chloride can also be removed from the chlorine gas by treating with sulfuric acid.

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