Process for producing 2-hydroxy-4-methyl-thiobutyric acid (MHA) and its use as feed stuff supplement
2000
Suchsland, H. | Hafner, V.
Known processes for producing 2-hydroxy-4-methylthiobutyric acid (MHA) use a liquid-liquid extraction or a combined liquid/liquid and solid/liquid phase separation to isolate MHA from a reaction mixture produced by hydrolyzing MMP - cyanhydrine. These processes are either costly or produce waste that is difficult to dispose of. These disadvantages are eliminated by isolating MHA by solid/liquid separation. The reaction mixture is evaporated until a MHA-containing salt residue with little or no residual water is obtained. The MHA-containing salt residue is treated with an organic solvent to produce a suspension; solid components are separated from the obtained suspension until a MHA-containing solution is obtained; the organic solvent is removed from the MHA-containing solution until a MHA residue is obtained and if required the MHA residue is then conditioned by water admixture. Besides high quality MHA, this process produces marketable crystallin ammonium sulphate and/or hydrogenated ammonium sulphate. This process is useful for producing feedstuff supplements. 2 Hydroxy-4-methylthiobutyric acid (MHA) is the hydroxy analogue of the essential amino acid methionine in racemic form and is, like the latter, an important additive to animal nutrition. In the raising of poultry MHA exhibits similar growth-stimulating properties like the amino acid known for this. However, the additive is also becoming increasingly interesting in other areas of animal nutrition
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