Process for recovering 2-hydroxy-4-methylthiobutyric acid (MHA), MHA and
its use
    1.
    发明授权
    Process for recovering 2-hydroxy-4-methylthiobutyric acid (MHA), MHA and its use 失效
    2-羟基-4-甲硫基丁酸(MHA),MHA及其用途的回收方法

    公开(公告)号:US5976609A

    公开(公告)日:1999-11-02

    申请号:US776217

    申请日:1997-01-13

    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.

    摘要翻译: PCT No.PCT / EP95 / 02515 Sec。 371日期1997年1月13日 102(e)日期1997年1月13日PCT提交1995年6月28日PCT公布。 公开号WO96 / 01809 日本1996年1月25日已知通过将氢氰酸(HCN)加入到甲基巯基丙醛(MMP)中获得的反应混合物和由此获得的甲基巯基丙醛氰基氢醌(MMP-CH)的水解来分离MHA 硫酸,其中使反应混合物与基本上不与水混溶的有机溶剂接触,以形成从反应混合物中转移有溶剂和MHA的提取溶液,并且获得MHA作为 该提取液通过浓缩。 关于有助于生产具有极低二聚体,低聚物和副产物含量的高浓缩产物的反应产物的加工的本发明的最简单和最经济的方法的特征在于以这种方式进行浓缩 剩余的提取物含有小于4重量%,优选小于2重量%的水。 动物饲料补充剂,补充动物饲料的混合物。 与甲硫氨酸或铵-MAA。

    Process for obtaining 2-hydroxy-4-methylthiobutyric acid (MHA)
    3.
    发明授权
    Process for obtaining 2-hydroxy-4-methylthiobutyric acid (MHA) 有权
    获得2-羟基-4-甲硫基丁酸(MHA)的方法

    公开(公告)号:US6140536A

    公开(公告)日:2000-10-31

    申请号:US91796

    申请日:1998-09-01

    CPC分类号: C07C319/28 C07C319/20

    摘要: A method for the isolation of 2-hydroxy-4-methylthiobutyric acid (MHA), wherein MHA is isolated from a reaction mixture obtained by addition of hydrogen cyanide (HCN) to methylmercaptopropionaldehyde (MMP) and hydrolysis by sulphuric acid of the methylmercaptopropionaldehyde cyanohydrin (MMP-CH) thus obtained. The reaction mixture is brought into contact in a liquid/liquid extraction system with an organic solvent substantially immiscible with water, in order to form an extraction solution which contains the solvent and the MHA transferred out of the reaction mixture. By bringing the salt content of the reaction mixture, prior to the liquid/liquid extraction, to a concentration of about >50 wt. % (wt./wt.), preferably >55 wt. %, referred to the sum of the inorganic constituents of the reaction mixture, the coordinated use of energy in the total system is improved, the evaporation of strongly corrosive solutions is avoided, the efficiency of the hydrolysis step is increased and the distribution coefficients during the extraction are improved. The MHA is isolated as the extract from this extraction solution by evaporation, and may be used as animal feed supplement.

    摘要翻译: PCT No.PCT / EP96 / 05437 Sec。 371日期:1998年9月1日 102(e)1998年9月1日PCT PCT 1996年12月5日PCT公布。 公开号WO97 / 23452 日期1997年7月3日分离2-羟基-4-甲硫基丁酸(MHA)的方法,其中MHA是通过将氰化氢(HCN)加入到甲基巯基丙醛(MMP)中并通过硫酸水解而获得的反应混合物中分离的 的甲基巯基丙醛氰醇(MMP-CH)。 使反应混合物在液/液萃取系统中与基本上与水不混溶的有机溶剂接触,以形成含有溶剂和从反应混合物中转移的MHA的萃取溶液。 通过使液体/液体萃取之前的反应混合物的盐含量达到约> 50wt。 %(重量/重量),优选> 55重量% %,是指反应混合物的无机成分之和,改善了总体系中能量的协调使用,避免了强腐蚀性溶液的蒸发,提高了水解步骤的效率,提高了分散系数 提取提高。 通过蒸发将MHA作为来自该提取溶液的提取物分离,并且可以用作动物饲料添加剂。