94087-93-1Relevant articles and documents
D, L-2-hydroxy-4-methylthiobutyric acid trace elements, chelate preparation method
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Paragraph 0070; 0071, (2017/02/24)
The invention aims at the chemical industry field, and relates to a preparation method of a D,L-2-hydroxy-4-methylthiobutyric acid-trace element chelate. The method comprises the following steps: preparing a hydrocyanic acid mixed gas by adopting an Andrussow process, and reacting the hydrocyanic acid mixed gas with methylthiopropionaldehyde to obtain a 2-hydroxy-4-methylthiobutyronityile system, hydrolyzing the 2-hydroxy-4-methylthiobutyronityile system by an inorganic alkali to obtain D,L-2-hydroxy-4-methylthiobutyrate, and chelating the D,L-2-hydroxy-4-methylthiobutyrate with a trace metal element salt to generate the D,L-2-hydroxy-4-methylthiobutyric acid-trace element chelate. The method has the advantages of few technological steps, cheap and easily available raw materials, stable properties of the above intermediate, and low total production cost; the obtained D,L-2-hydroxy-4-methylthiobutyric acid-trace element chelate has the advantages of high yield, high purity and large bulk density; and the D,L-2-hydroxy-4-methylthiobutyric acid-trace element chelate can be effectively mixed with feeds as an animal feed additive to supplement trace elements and amino acids in the daily ration and improve the endozoic production and immunity performances, and can also be used as a medicinal reagent.
METHOD FOR THE CONVERSION OF METHYLMERCAPTOPROPIONALDEHYDE FORMED FROM CRUDE ACROLEIN AND CRUDE METHYL MERCAPTAN
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Paragraph 0111-0119, (2013/09/26)
A reactive rectification column suitable for the production of 2-hydroxy-4-methylmercaptobutyric acid and/or methionine contains a weir having a height of 100 mm or more.
