Preparation method of large particle crystal form high bulk density 2-hydroxy-4-methylthiobutyrate calcium

Abstract

The invention belongs to the field of the chemical industry, and relates to a preparation method of large-particle crystal type high-bulk-density calcium 2-hydroxy-4-(methylthio)butyrate. The preparation method of the large-particle crystal type high-bulk-density calcium 2-hydroxy-4-(methylthio)butyrate comprises the following steps that 2-hydroxy-4-(methylthio)butyric acid, a calcium compound and a crystallizing agent are arranged in an aqueous medium, the pH is adjusted to be 5-7, the temperature is 60-80DEG C, stirring and full reactions are carried out, cooling crystallization is carried out to obtain calcium 2-hydroxy-4-(methylthio)butyrate crystals, separation is carried out to obtain crystals and coarse product mother liquid, and the crystals serve as calcium 2-hydroxy-4-(methylthio)butyrate coarse products. The calcium compound is one or more of calcium salt, calcium oxide and calcium hydroxide, and the use amount of the crystallizing agent is 50ppm-3000ppm of the mass of the 2-hydroxy-4-(methylthio)butyric acid. Materials produced through the preparation method of the large-particle crystal type high-bulk-density calcium 2-hydroxy-4-(methylthio)butyrate are high in purity, dehydration is easy, drying is rapid, crystal particles obtained after drying are large, good in mobility and large in bulk density, the amount of dust is low, glossiness is high, and the materials are more applicable to fodder.

Description

technical field [0001] The invention aims at the field of chemical industry and relates to a preparation method of calcium 2-hydroxy-4-methylthiobutyrate with large particle crystal form and high bulk density. Background technique [0002] 2-Hydroxy-4-methylthiobutyric acid is a methionine hydroxyl analogue, which has low toxicity, low rumen degradation rate, promotes the synthesis of rumen microorganisms, saves protein in the diet, improves the production performance of dairy cows, and improves animal health. It is the most economical and effective amino acid source for animals due to its production performance and immunity, reduced ammonia emissions, less environmental pollution, simple production process, and low price. Although methionine hydroxy analogs have the above advantages and are gradually replacing some expensive amino acids in the market, they still have the following problems: [0003] (1) It has a strong corrosive and pungent odor, and it is inconvenient to ...

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Problems solved by technology

[0003] (1) It has a strong corrosive and pungent odor, and it is inconvenient to store, transport and use, so it is necessary to use an expensive special liquid feeding system;

[0004] (2) It is very viscous, and it is not easy to mix evenly in the feed premix;

[0005] (3) A large amount of heat is released when it comes into contact with water, causing the feed to heat up and ferment and become rancid during storage and transportation; the acidity is very high, with a pH of about 1, and it is easy to react with feed or other ingredients in the premixed feed. Nutrients cause damage

However, in actual production, the synthesized calcium 2-hydroxy-4-methylthiobutyrate has a small particle size, sticky filter cake, difficult dehydration, and long drying time; the production process is dusty, inconvenient to operate, and consumes a lot of energy; in addition , the produced calcium 2-hydroxy-4-methylthiobutyrate has high viscosity, low density and poor fluency, and it is difficult to fully mix with the feed, resulting in unstable feed quality and affecting the feeding effect

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