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Preparation method for calcium D,L-2-hydroxy-4-methylthiobutyrate

A technology of calcium methylthiobutyrate and methylthiobutyrate, which is applied in the fields of sulfide preparation and organic chemistry, and can solve feed rancidity, high viscosity of calcium hydroxy-4-methylthiobutyrate and harsh conditions And other issues

Active Publication Date: 2014-03-19
NINGXIA UNISPLENDOUR TIANHUA METHIONINE CO LTD
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

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: 1) It has strong corrosive and pungent odor, and is inconvenient to store, transport and use. It is necessary to use an expensive special liquid feeding system; 2) It is very viscous, and it is not easy to mix evenly in the feed premix; 3) A large amount of heat is released when it meets water, which causes the feed to become rancid during storage and transportation; it is very acidic, The pH is about 1, and it is easy to react with acid and alkali in the feed or other ingredients in the premixed feed, causing damage to the nutrients in the feed
The main problems of this method are: 1) D,L-2-hydroxy-4-methylthiobutyric acid ammonium salt is dehydrated to form D,L-2-hydroxy-4-methylthiobutyramide, and high temperature is required for rectification and purification High vacuum and harsh conditions limit large-scale industrial production; 2) The yield of calcium D,L-2-hydroxy-4-methylthiobutyrate is low, only about 70%
[0009] In addition, in the actual production of the method disclosed in the above-mentioned documents, the synthetic D,L-2-hydroxy-4-methylthiobutyric acid calcium has problems such as high viscosity, low density, poor fluency, etc., so it is difficult to fully mix with the feed , the quality of the feed is unstable, which in turn affects the feeding effect

Method used

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  • Preparation method for calcium D,L-2-hydroxy-4-methylthiobutyrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The hydrocyanic acid mixed gas I from the hydrocyanic acid synthesis tower was detected. The composition of the hydrocyanic acid mixed gas I was: 8.87% hydrocyanic acid gas, 3.88% water vapor, 1.64% ammonia gas, 1.13% hydrogen gas, nitrogen gas 76.01%, oxygen 1.48%, carbon monoxide 5.67%, carbon dioxide 1.13%, methane 0.39%.

[0047] Hydrocyanic acid mixed gas I passes through a 75% sulfuric acid tower to absorb ammonia and water vapor in the mixed gas, and the composition of the obtained hydrocyanic acid mixed gas II is: 9.35% hydrocyanic acid gas, 1.57% hydrogen gas, and 79.44% nitrogen gas %, oxygen 1.71%, carbon monoxide 5.79%, carbon dioxide 1.50%, methane 0.64%.

Embodiment 2

[0049] Pass hydrogen cyanide mixed gas II into 223.3g of 94.5% methional with a mass fraction of 223.3g, which contains 3.3g of pyridine. React under normal pressure, control the reaction temperature to 45°C, the ventilation rate to 300L / min, absorb the tail gas with sodium hydroxide, and monitor the residual amount of methionaldehyde by HPLC. When the residual amount of methionaldehyde is less than 0.5%, it is the end of the reaction, and the feeding can be stopped. A total of 270.64 g of light yellow liquid was obtained, the content of 2-hydroxy-4-methylthiobutyronitrile was 98%, and the residual hydrocyanic acid was 0.5%.

Embodiment 3

[0051]Pass hydrogen cyanide mixed gas II into 223.3g of methional with a mass fraction of 94.5%, which contains 2.2g of pyridine and 10g of water. Under 0.15MPa, the reaction temperature is controlled to be 42°C, the ventilation rate is 280L / min, the tail gas is absorbed with sodium hydroxide, and the residual amount of methional is monitored by HPLC. When the residual amount of methionaldehyde is less than 0.5%, it is the end of the reaction, and the feeding can be stopped. A total of 279.54 g of light yellow liquid was obtained, the content of 2-hydroxy-4-methylthiobutyronitrile was 98%, and the residual hydrocyanic acid was 0.07%.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C323/52C07C319/20
Inventor 吴传隆秦岭朱晓莉杨帆王用贵朱丽利任星宇陈宏杨李欧
Owner NINGXIA UNISPLENDOUR TIANHUA METHIONINE CO LTD
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