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    VERFAHREN ZUR GEWINNUNG VON 2-HYDROXY-4-METHYLTHIOBUTTERSÄURE (MHA)
    1.
    发明公开
    VERFAHREN ZUR GEWINNUNG VON 2-HYDROXY-4-METHYLTHIOBUTTERSÄURE (MHA) 失效
    一种获得2-羟基-4-甲硫基丁（MHA）

    公开(公告)号：EP0874811A1

    公开(公告)日：1998-11-04

    申请号：EP96943038.0

    申请日：1996-12-05

    申请人： Degussa Aktiengesellschaft

    发明人： HASSEBERG, Hans-Albrecht ,  HASSELBACH, Hans-Joachim ,  HUTHMACHER, Klaus ,  HÄFNER, Volker ,  HEINZEL, Harald ,  JÄGER, Barbara

    IPC分类号： C07C319 ,  C07C323

    CPC分类号： C07C319/28 ,  C07C319/20 ,  C07C323/52

    摘要： In known processes: the MHA is isolated from a reaction mixture obtained by addition of hydrocyanic acid (HCN) to methylmercapto-propionaldehyde (MMP) and hydrolysis of the resulting methylmercapto-propionaldehyde cyanhydrine (MMP-CH) with sulphuric acid; the reaction mixture is brought into contact in a fluid/fluid extraction system with an organic solvent which is essentially non-miscible with water to form an extraction solution containing the solvent and MHA from the reaction mixture, and the MHA is obtained as an extract from this extraction solvent by evaporation. Such processes solve the problem of sulphate waste by coupling with a sulphuric acid recovery system. For effective operation of the latter, the salt-containing waste streams must undergo evaporation. According to the invention, the salt content of the reaction mixture before fluid/fluid extraction is adjusted to a level greater than about 50 wt % and preferably greater than 55 wt % relative to the total quantity of non-organic components in the reaction mixture. This improves the energy balance of the entire process, eliminates the need to evaporate highly corrosive solutions, increases the conversion rate in the hydrolysis stage and improves the distribution coefficients in the extraction. The acid obtained can be used as animal fee additive.

    VERFAHREN ZUR GEWINNUNG VON 2-HYDROXY-4-METHYLTHIOBUTTERSÄURE (MHA), MHA UND DESSEN VERWENDUNG
    3.
    发明公开
    VERFAHREN ZUR GEWINNUNG VON 2-HYDROXY-4-METHYLTHIOBUTTERSÄURE (MHA), MHA UND DESSEN VERWENDUNG 失效
    一种获得2-羟基-4-甲硫基丁（MHA），MHA及其用途

    公开(公告)号：EP0770061A1

    公开(公告)日：1997-05-02

    申请号：EP95924331.0

    申请日：1995-06-28

    申请人： Degussa Aktiengesellschaft

    发明人： HASSEBERG, Hans-Albrecht ,  HUTHMACHER, Klaus ,  TANNER, Herbert ,  HÄFNER, Volker ,  HEINZEL, Harald

    IPC分类号： A23K1 ,  C07C319 ,  C07C323

    CPC分类号： C07C319/28 ,  A23K20/105 ,  C07C319/20 ,  Y10S426/807 ,  C07C323/60

    摘要： It is known to isolate MHA from a reaction mixture obtained by the addition of hydrocyanic acid (HCN) to methyl mercaptopropionic aldehyde (MMP) and the hydrolysis of the methyl mercapto propionic aldehyde cyanohydrine (MMP-CH) obtained thereby with sulphuric acid, in which the reaction mixture is brought into contact with a substantially non-water-miscible organic solvent, in order to form an extraction solution having the solvent and MHA transferred from the reaction mixture, and the MHA is obtained as an extract from this extraction solution by concentration. The simplest and most economical process of the invention concerning the processing of the reaction product which facilitates the production of a highly concentrated product with an extremely low dimer, oligomer and by-product content, is characterised in that the concentration is conducted in such a way that the remaining extract contains less than 4 wt % and preferably less than 2 wt % of water. Animal feed supplement, mixtures for supplementing animal feed, e.g. with methionine or ammonium-MHA.