Clean and environment-friendly production method for methionine hydroxyl analogue

Abstract

The invention relates to a clean and environment-friendly production method for a methionine hydroxyl analogue, aiming at solving the problems in a traditional production technological method that themethionine hydroxyl analogue and ammonium salt are difficult to separate and more methionine hydroxyl analogues are carried in the byproduct ammonium salt; the purity of the obtained ammonium salt ishigh; in a whole process, less odor is generated; the whole production process is safe, clean and environmentally friendly, and nearly no wastewater is discharged; the problem of extracting by utilizing an organic solvent in a traditional production technology is solved or the problem that a mixture of the methionine hydroxyl analogue and the ammonium salt are concentrated at high temperature sothat the methionine hydroxyl analogue is decomposed to generate odorous gas is solved; the content of a monomer in an obtained product is greater than that of a traditional production technology and the quality of the product is relatively high.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a clean and environment-friendly production method of methionine hydroxyl analogs. Background technique [0002] Methionine Hydroxy Analogue (MHA) is a highly acidic liquid organic acid containing 12 wt% water and 88 wt% active methionine hydroxy analogue (including at least 65 wt% 2-hydroxy-4 - methylthiobutyric acid monomer, and 2-hydroxy-4-methylthiobutyric acid dimer and multimer in an amount not exceeding 23% by weight). In poultry feeding, methionine hydroxy analogues exhibit properties similar to those of amino acids known to act as growth stimulators and thus become important additives for animal feed. [0003] One of the synthetic methods of methionine hydroxyl analogs is cyanohydrin hydrolysis, which is to react methylthiopropionaldehyde with hydrocyanic acid to obtain 2-hydroxyl-4-methylthiobutyronitrile, which is hydrated under the action of sulfuric acid...

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a clean and environmentally friendly production method for methionine analogues. This method can save equipment investment and avoid the difficult problem of separation of methionine hydroxyl analogues and ammonium salts in the traditional production process. The problem of increasing polymers and polymers, solves the problem of a large amount of waste water and by-product inorganic salts produced by traditional production methods, and solves a series of problems and unfavorable factors caused by organic solvent extraction by traditional production methods