Method for synthesizing zinc methionine chelates

Abstract

The invention relates to a method for synthesizing zinc methionine chelates. The method includes steps of feeding glycerin and water into reaction vessels, mixing and stirring the glycerin and the water with each other, sequentially adding methionine, zinc salt and catalysts into the reaction vessels in stirring procedures and carrying out reaction under 1-5 standard atmospheric pressures and thecondition of the temperature of 105-250 DEG C for 0.5-6 hours; filtering reaction products while the reaction products are hot so as to obtain filter cake after the reaction is completely carried outat the step A, washing the filter cake by an appropriate quantity of water, and drying and smashing the filter cake to obtain the zinc methionine chelates. The catalysts are selected from a type of sodium tartrate, sodium benzoate, sodium oxalate and sodium salicylate. The method has the advantages that reaction which is originally difficult to carry out is divided into two easy steps, reaction iscarried out on the glycerin and zinc oxide at first to obtain a certain intermediate, then reaction is carried out on the intermediate and the methionine to generate zinc methionine, accordingly, thereaction is high in yield, and wastewater with salt byproducts can be prevented.

Description

technical field [0001] The invention relates to the technical field of organic compound preparation, in particular to a method for synthesizing zinc methionine chelate. Background technique [0002] Zinc is one of the essential trace elements for animals, and is a component of various metalloenzymes and insulin. It is called the "element of life" because of its extensive physiological and biochemical functions in the body. Zinc methionine is the zinc salt of methionine, which is formed by chelating methionine and zinc. It is a new type of feed additive and can be used as a supplement for the trace element zinc in animals. Many reports have confirmed that the addition of zinc methionine can improve the growth, reproduction and health of animals, and can promote the rapid proliferation of tongue mucosa taste bud cells, regulate appetite, inhibit certain harmful bacteria in the intestinal tract, prolong the residence time of food in the digestive tract, and improve the secreti...

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Problems solved by technology

[0003] In the prior art, the conventional synthesis method of methionine zinc chelate is to react with methionine and zinc salts such as zinc sulfate and zinc chloride, and a strong base in an aqueous solution system. The reaction conditions are simple, easy to carry out, and the yield is very high. It is the most commonly used method at present, but it is inevitable to produce sodium sulfate as a by-product, and the zinc sulfate is replaced by other zinc salts (such as zinc chloride), and the problem also exists. Therefore, in practical applications, the filtrate is saline wastewater. If it cannot be discharged directly, it must be treated by evaporation and crystallization; this method will inevitably produce salt by-products, such as sodium sulfate, and there will be subsequent waste discharge or disposal problems

[0004] It is also reported that methionine and zinc oxide are used as raw materials for synthesis. It is difficult to generate zinc methionine from methionine and zinc oxide in an aqueous solution system, or it is difficult to react completely; the product of this reaction is zinc methionine and water without by-products; The filtered filtrate and the water for washing the filter cake will only contain methionine (or a very small amount of zinc methionine, because the solubility of zinc methionine is extremely small), which can be recycled without discharge. Therefore, the process can achieve no waste water discharge and has the advantages of Advantage; but because the direct reaction between zinc methionine and zinc oxide is very difficult, the yield is very low, and it is not suitable for quantitative production. If zinc oxide is replaced by zinc carbonate, although the yield can be increased to about 40%, it is still not ideal

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