94087-93-1Relevant academic research and scientific papers
D, L-2-hydroxy-4-methylthiobutyric acid trace elements, chelate preparation method
-
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.
D, L-2-hydroxy-4-methylthio butyric calcium preparation method
-
Paragraph 0070; 0071, (2017/02/24)
The invention is directed at the field of chemical engineering and provides a preparation method for calcium D,L-2-hydroxy-4-methylthiobutyrate. The preparation method comprises the following steps: preparing a hydrocyanic acid gas mixture by using an Andrussow process; preparing a 2-hydroxy-4-methylthiobutyronityile system with the hydrocyanic acid gas mixture and methylthiopropionaldehyde as starting raw materials; hydrolyzing the 2-hydroxy-4-methylthiobutyronityile system with inorganic base so as to obtain D,L-2-hydroxy-4-methylthiobutyrate; and chelating D,L-2-hydroxy-4-methylthiobutyrate with a soluble calcium salt so as to produce calcium D,L-2-hydroxy-4-methylthiobutyrate. The method has the advantages of a few processing step, cheap and easily available raw materials, stable intermediate properties and low total production cost. Prepared calcium D,L-2-hydroxy-4-methylthiobutyrate has the advantages of high yield, high purity, a powder crystal form and great bulk density, can be used as an animal feed additive for effective mixing with a feed so as to supplement trace elements and amino acid in daily ration and improve production performance and immune performance of animals and can also be used as a medicine reagent.
METHOD FOR THE CONVERSION OF METHYLMERCAPTOPROPIONALDEHYDE FORMED FROM CRUDE ACROLEIN AND CRUDE METHYL MERCAPTAN
-
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.
