2-hydroxy-4-methylthiobutyric acid acquisition method (MHA)

(57) Abstract: Methyl mercaptopropionate methylmercapto addition obtained reaction and at that time the aldehyde hydrogen cyanide to (MMP) (HCN) propionaldehyde over cyanohydrin (MMP-CH), obtained by hydrolysis using sulfuric acid are reaction mixture isolated MHA from this case, the reaction mixture is essentially water-immiscible organic solvent, a liquid - is contacted in a liquid extraction system was converted and the solvent from the reaction mixture MHA cup extraction solution to form the MHA, by known methods in acquiring by evaporation as an extract from the extraction solution, the use of SK devices requiring the evaporation of salt-containing waste stream to the operation of the apparatus having the bets sulfate waste stream problems due ring is resolved. According to the present invention, the salt content of the reaction mixture, a liquid - in front of the liquid extraction, based on the sum of the non-organic components of the reaction mixture, about> 50 wt% (wt / wt), preferably> 55 wt by the% concentration to improve energy balance of the whole process, to avoid evaporation of the strong corrosive solution, increase the conversion rate in the hydrolysis process, and to improve the distribution coefficient of the extraction it can. Feed additive substance.