d, the preparation method of l-2-hydroxyl-4-methylthiobutyrate calcium

Abstract

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.

Description

technical field

[0001] The present invention is aimed at the field of chemical engineering, and relates to a preparation method of calcium D,L-2-hydroxy-4-methylthiobutyrate, in particular to a method for preparing calcium D,L-2-hydroxy-4-methylthiobutyrate Method for preparing calcium D,L-2-hydroxy-4-methylthiobutyrate based on . Background technique

[0002] Methionine hydroxy analogue (MHA), also known as D,L-2-hydroxy-4-methylthiobutyric acid, is a methionine additive with low toxicity, low rumen degradation rate, promotion of rumen microbial synthesis, and saving in dietary It is the most economical and effective amino acid source for animals, with the characteristics of high protein, improving the production performance of dairy cows, improving the production performance and immunity of animals, reducing ammonia emissions, less polluting the environment, simple production process, and low price. Although methionine hydroxy analogs have the above advantages and are gra...

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