Raw material composition and method for preparing methionine hydroxyl analogue without byproduct salt separation by using raw material composition

Abstract

The invention belongs to the technical field of animal feed additive preparation, and particularly relates to a raw material composition for producing a methionine hydroxyl analogue without byproduct salt separation, a methionine hydroxyl analogue product as well as a preparation method, a production system and a feed preparation of the methionine hydroxyl analogue product. The raw material composition disclosed by the invention consists of 2-hydroxy-4-methylthio butyronitrile and calcium oxide. The raw material composition can be directly used for preparing a preparation, and the specific preparation method comprises the following steps: fully reacting a phosphoric acid solution with cyanohydrin to obtain a reaction solution containing 2-hydroxy-4-methylthiobutyric acid or a reaction solution containing a mixture of 2-hydroxy-4-methylthiobutyric acid and 2-hydroxy-4-methylthiobutyramide; and adding the calcium oxide into the reaction liquid, and fully reacting to obtain the white suspension emulsion. According to the method disclosed by the invention, the complicated and expensive separation and post-treatment operation of the methionine hydroxyl analogue and the byproduct salt in the prior art is avoided, the byproduct inorganic salt which is low in value and difficult to directly utilize is not generated, and the obtained methionine hydroxyl analogue product has better bioavailability, can be directly used for preparing feed, and has a good application prospect. And the molar ratio of the cyanohydrin to the phosphoric acid to the calcium oxide can be calculated and determined according to the nutritional requirements of different animals. The production process disclosed by the invention is simple, efficient, high in controllability and green and environment-friendly.

Description

[0001] The invention belongs to the technical field of preparation of animal feed additives, and specifically relates to a raw material composition for producing methionine hydroxy analogs without separation of by-product salts, a methionine hydroxy analog product, a preparation method thereof, a production system and a feed preparation. Background technique [0002] Methionine hydroxy analogue (MHA, scientific name 2-hydroxy-4-methylthiobutyric acid) is a good feed methionine source, which can be converted into methionine necessary for animals in the animal body. As early as the 1950s, MHA has been applied in animal husbandry, and has been confirmed by the feed industry, animal husbandry and pet production enterprises that MHA is an excellent methionine source. [0003] The main production process of methionine hydroxy analogs is prepared by hydrolysis of 2-hydroxy-4-methylthiobutyronitrile (cyanohydrin for short) under the action of inorganic acids (such as hydrochloric acid,...

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Problems solved by technology

In industry, the saturated ammonium salt is generally obtained by neutralization with ammonia water, and then physically separated from the methionine hydroxy analog by decantation, filtration, etc., but this method often requires The methionine hydroxy analog oil phase is over-concentrated, and then diluted to 88% concentration after removing the ammonium salt, which not only causes waste of energy consumption, but also causes the methionine hydroxy analog oil phase to polymerize and become viscous, making the filtration operation very inconvenient. The separated by-product ammonium salt is also difficult to be sold directly because of the methionine hydroxyl analog entrained with a certain color or the smell of the methionine hydroxyl analog is too heavy. Further removal of the methionine hydroxyl analog in the by-product ammonium salt is difficult. Take advantage of

As an improvement, use a wat...

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