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    12.
    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.

    13.
    发明专利
    未知

    公开(公告)号：DK149089C

    公开(公告)日：1986-08-25

    申请号：DK306981

    申请日：1981-07-10

    Applicant: DEGUSSA

    Inventor： BETHGE HORST ,  KLEEMANN AXEL ,  MARTENS JUERGEN ,  SCHERBERICH PAUL

    IPC: C07D277/10 ,  C07D277/60

    Abstract: There are produced thiazoline-(3) compounds which optionally are substituted or unsubstituted in the 2 and/or 5 positions by reaction of oxo compounds with a metal sulfides, ammonia and oxo compounds which are substituted by halogen in the position adjacent to the oxo group. In this process a mixture of oxo compounds, metal sulfides and ammonia is present and the halogen substituted oxo compound is introduced into the mixture. By using in this manner of mixing, high yields are obtained in a relatively short period of time.

    15.
    发明专利
    未知

    公开(公告)号：FI73977B

    公开(公告)日：1987-08-31

    申请号：FI830037

    申请日：1983-01-06

    Applicant: DEGUSSA

    Inventor： KLEEMANN AXEL ,  MARTENS JUERGEN ,  WEIGEL HORST

    IPC: C07B57/00 ,  C07B31/00 ,  C07C20060101 ,  C07C67/00 ,  C07C313/00 ,  C07C319/28 ,  C07C323/58 ,  C07C149/243 ,  C07C148/04

    Abstract: The subject matter of the invention is a process for the recovery of S-(carboxymethyl)-(R)-cysteine and S-(carboxymethyl)-(S)-cysteine from a mixture of the two enantiomers. The mixture to be separated is dissolved in water in the presence of sufficient ammonia that the ammonium salt solution formed has a pH between 6 and 9. Then there is brought about in the solution of ammonium salt a state of supersaturation by the addition of seeding crystals of the ammonium salt of one of the two enantiomers, insofar as the starting material contains one of the two enantiomers in excess, the ammonium salt of this enantiomer, the ammonium salt of one of the two enantiomers is brought to crystallization and separated off. Subsequently by addition of seeding crystals of the ammonium salt of the other enantiomers to the remaining mother liquor the ammonium salt of this enantiomer is likewise brought to crystallization and separated off. Finally the respective S-(carboxymethyl)-cysteine is set free from the two ammonium salts.

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