Method and device for using crude hydrocyanic acid to continuously produce D, L-2-hydroxy-4-methylthio-butyric acid microelement chelate

Abstract

The invention relates to a method and device for using crude hydrocyanic acid to continuously produce D, L-2-hydroxy-4-methylthio-butyric acid microelement chelate. The device comprises a hydrocyanic acid synthetic tower, an acid tower, a multi-level series tank reactor, a tank reactor, a microelement chelate synthetic tower and a cooling crystallization tower. The method for continuously producing the D, L-2-hydroxy-4-methylthio-butyric acid microelement chelate comprises the steps of the preparation of cyanic acid mixed gas II, the preparation of 2-hydroxy-4-methylthio-butyronitrile in the multi-level series tank reactor, the preparation of D, L-2-hydroxy-4-methylthio- butyrate in the tank reactor, and the preparation of the D, L-2-hydroxy-4-methylthio-butyric acid microelement chelate in the microelement chelate synthetic tower, and the treatment on products or reaction residues by using a low-temperature storage tank, an incinerator, a stripping tower and the like. According to the device and method, provided by the invention, crude hydrocyanic acid and crude methylthiopropanal are used for continuously producing the D, L-2-hydroxy-4-methylthio-butyric acid microelement chelate, the production cost is low, the side reactions are few, the yield is high, and industrial large-scale continuous production can be realized.

Description

technical field [0001] The invention relates to the field of fine chemical industry, in particular to a method and a device for continuously producing D,L-2-hydroxy-4-methylthiobutyric acid trace element chelate by using hydrocyanic acid mixed gas. Background technique [0002] Methionine hydroxy analogs have low toxicity, low rumen degradation rate, promote the synthesis of rumen microorganisms, save protein in the diet, improve the production performance of dairy cows, improve the production performance and immunity of animals, reduce ammonia emissions, and pollute the environment less , simple production process, low price and other characteristics, it is the most economical and effective amino acid source for animals. Although, methionine hydroxy analogues have the above-mentioned advantages, they are gradually replacing some expensive amino acids in the market. However, its problems are: strong corrosive and pungent odor, inconvenient storage, transportation, and use, ...

AI Technical Summary

Problems solved by technology

However, its problems are: strong corrosive and pungent odor, inconvenient storage, transportation, and use, and expensive special liquid feeding system must be used; it is very viscous, and it is not easy to mix evenly in the feed premix; When it comes into contact with water, it releases a lot of heat, causing the feed to heat up and ferment and become rancid during storage and transportation; it is very acidic, with a pH of about 1, and it is easy to react with feed or other ingredients in the premixed feed, causing damage to the nutrients in the feed. destroy

[0007] Therefore traditional D, the D that L-2-hydroxyl-4-methylthiobutyric acid metal chelate production technology obtains, L-2-hydroxyl-4-methylthiobutyric acid metal chelate has particle size little, filter Cake is sticky, dehydration is difficult, drying time is long, and the production process is dusty, which causes great inconvenience and waste to production operations and energy consumption

At the same time, the produced egg D, L-2-hydroxy-4-methylthiobutyric acid metal chelate has high viscosity, low density, poor fluency, and it is difficult to fully mix with the feed. The solution will cause the feed quality to be partially stable and affect the feed feed effect

Furthermore, there is no patent report on the production device of D,L-2-hydroxyl-4-methylthiobutyric acid trace chelate

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