Preparation method of modified methionine hydroxy analog-calcium feed additive

Abstract

The invention discloses a preparation method of a modified methionine hydroxy analog-calcium feed additive. The preparation method comprises the following steps of: conducting reaction on acraldehyde taken as a main raw material and methyl mercaptan in a specially-sealed container under the action of a catalyst to generate methylthiopropanal; synthesizing 2-hydroxyl-4methylthio-butyronitrile by the generated methylthiopropanal and hydrocyanic acid under the action of the catalyst; hydrolyzing in the existence of concentrated sulphuric acid to generate 2-hydroxyl-4methylthio-bulyrate; neutralizing by using a saturated calcium hydroxide solution; adding vinegar, montmorillonite flour, polyethylene glycol 4000 and poplar bark powder to refine a finished modified methionine hydroxy analog-calcium feed additive. According to the whole production process, the scientific and technological content is high, the path is good, the biological value is high, the production cost is low, the production process is simple, raw material consumption is low, byproducts are few, three-waste discharge does not exist in the whole production process and environmental pollution is low.

Description

technical field

[0001] The invention relates to a production method of a feed additive, in particular to a preparation method of a modified hydroxymethionine calcium feed additive. Background technique

[0002] As an amino acid feed additive in feed, methionine is an animal growth promoter, used for protein synthesis, and can improve feed conversion rate, animal growth rate and poultry egg production rate. However, the production cost of methionine is relatively high, the domestic production is less, almost none, and the supply is in short supply. In order to meet the development of China's aquaculture and feed industry, scientific and technological personnel have developed methionine analogues such as 2-hydroxy-4-methylthio-butyric acid, "Preparation method of 2-hydroxy-4-methylthiobutyric acid with storage stability" in Chinese Patent No. CN97125703.5. It has the advantages of short process flow and low cost, and the compound can also be converted into methionine in the l...