A kind of preparation method of threonine copper

Abstract

The invention discloses a preparation method of threonine copper, which comprises the following steps: directly adding trace element copper source basic salt into the threonine concentrated liquid obtained by fermentation method for reaction, raising the temperature and stirring to fully react, Cooling and crystallization, followed by solid-liquid separation, washing, drying and pulverizing the crystals obtained after solid-liquid separation to obtain threonine copper product. The preparation method of the invention has the advantages of simple process, convenient operation, low cost, safe product, small investment and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of feed additives, in particular to a preparation method of threonine chelate. Background technique [0002] At present, domestic feed resources are relatively scarce, especially the lack of protein feed such as soybean meal and fish meal, which seriously restricts the development of animal husbandry. Threonine is usually the second or third limiting amino acid in pig feed, and the third or fourth limiting amino acid in poultry feed. With the wide application of lysine and methionine synthesis products in compound feed, it gradually Become the main limiting factor affecting the production performance of livestock and poultry, especially after adding lysine to low-protein diets, threonine becomes the first limiting amino acid for growing pigs. If threonine is not used in the feed, the adjustment of threonine in the feed can only rely on protein raw materials, and protein raw materials not only...

AI Technical Summary

Problems solved by technology

There are following deficiencies in this technical scheme: (1) there is very big potential safety hazard in the raw material copper sulfate that adopts

(2) The inert gas protection reaction also increases the input and operation steps of production equipment

(3) Vacuum concentration reaction increases equipment input and production cost

[0006] CN101838214A Chinese patent document discloses a preparation method of feed additive DL-threonine chelated copper, wherein it is mentioned that glycine is used as raw material, glycine reacts with basic copper carbonate to generate glycine chelated copper, and glycine chelates copper with ethyl Aldehyde reaction generates DL-threonine chelated copper, and this preparation method also has the following deficiencies: (1) is affected by factors such as cost, yield and environmental protection, adopts fermentation method to produce threonine mostly in the industrial scale production at present, Therefore, the production cost of the entire process route of the aforementioned patent method is much higher than that of threonine and copper source to synthesize threonine copper

(2) Commercially available basic copper carbonate is difficult to buy pure (usually a mixture, chemical formula 2CuCO 3 ·Cu(OH) 2 and the chemical formula is CuCO 3 ·Cu(OH) 2 and mixtures containing crystal water products)

(3) There are potential safety hazards in the reaction of some raw materials in an unsealed environment of 60°C to 80°C: for example, methanol can easily cause blindness; acetaldehyde has a boiling point of only 20.8°C, is flammable, volatile, explosive, irritating and sensitizing, Inhalation of high concentrations can be fatal, so the aforementioned patented method is prone to safety hazards

[0007] In addition, in the prior art, there are also methods for generating chelates between basic copper salts and weak acids, but some of these methods have low yields, some obviously violate the general laws of chemical reactions, and the selection of some raw materials is obviously unreasonable. , these existing methods are difficult to carry out large-scale industrial application