Preparation method for feed-grade copper citrate

Abstract

The invention discloses a preparation method for feed-grade copper citrate. The method comprises the following steps: (1) throwing citric acid and water into a reaction kettle to form a 20%-25% citricacid aqueous solution, and performing heating to the temperature of 80 DEG C-100 DEG C; (2) turning on a stirrer, slowly adding basic copper carbonate for a neutralization reaction according to the mass ratio of the citric acid to the basic copper carbonate of 1:(0.8-1) to form copper citrate, and adding a little amount of citric acid to control the pH value of a reaction solution to be 4-6, wherein a generated CO2 gas enters an absorption tank through a gas discharging opening to be absorbed; (3) filtering the generated copper citrate, performing concentration, performing cooling to a room temperature, putting the cooled material into a centrifugation machine, performing dehydration to obtain a copper citrate crystal, and discharging a separated waste liquid into a waste-liquid pond forrecycling; and (4) putting the obtained copper citrate crystal into a dryer, performing drying for 1-2h at the temperature condition of 100 DEG C-120 DEGC to remove some of crystal water to obtain a finished product of the feed-grade copper citrate. The product obtained by the method provided by the invention has a high yield, less impurities, and an environmentally-friendly production process.

Description

technical field [0001] The invention belongs to the field of feed additives, in particular to a preparation method of feed grade copper citrate. Background technique [0002] In recent years, the new copper sources used by domestic feed and breeding enterprises mainly include amino acid complex (chelate) copper, protein copper, yeast copper, basic copper chloride, etc., of which amino acid complex (chelate) copper, protein copper, yeast copper It belongs to organic copper, while basic copper chloride is inorganic copper. Most of the research results have confirmed that the biological availability of organic copper is higher than that of inorganic copper, and it can reduce the content of fecal copper in animal excrement and reduce the pollution of heavy metals to the environment. However, the main problem of existing amino acid complex (chelated) copper, protein copper, and yeast copper in practical applications is the lack of direct experimental evidence of chemical charact...

AI Technical Summary

Problems solved by technology

Regarding food and pharmaceutical grade copper citrate, the common production method is to use copper carbonate and copper oxide as raw materials to react with edible citric acid to prepare copper citrate, but this method is not suitable for the production of feed grade copper citrate, because copper carbonate is difficult Soluble in water, do not react with water, can not obtain pure copper carbonate, can only form a mixture, and copper oxide is a toxic substance, if copper oxide is used as a raw material, it may cause great harm to the health of production workers. Inhalation of a large amount of copper oxide dust will cause chills, elevated body temperature, and respiratory tract irritation symptoms. Long-term exposure may cause respiratory tract and conjunctival irritation, epistaxis, nasal mucosal bleeding points or ulcers, and even nasal septum perforation and dermatitis

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