Purification process of methionine

Abstract

The invention provides a purification process of methionine. By separating methionine and by-product salts with macroporous resin, and by absorption and desorption, a methionine product not less than 99% in purity is obtained; the methionine content of the by-products is not greater than 0.03%. The yield of the methionine by the resin is not less than 98%. The purification process has the advantages that the existing production process can be simplified, the methionine quality can be improved, and the methionine production cost can be reduced.

Description

Technical field: [0001] The invention belongs to the field of chemical industry, and in particular relates to a process for purifying methionine. Background technique: [0002] Methionine, also known as methionine or methionine, is closely related to the metabolism of various sulfur-containing compounds in organisms. When methionine is lacking, it will cause loss of appetite, slow growth or no weight gain, kidney enlargement and iron accumulation in the liver, and finally lead to liver necrosis or fibrosis. Another kind of methionine, called methionine hydroxyl derivatives (ie liquid methionine), is widely used as a feed additive and can be used as a methionine nutritional supplement to promote animal growth and development. [0003] Both methionine and liquid methionine are a kind of amino acid, the only difference is that at the α position, the methionine is connected to -NH2, while the liquid methionine is connected to -OH. When the solution pH<pI (isoelectric point)...

AI Technical Summary

Problems solved by technology

In the production process of both methods, there will be a process requirement that methionine solution and salt-containing by-products need to be separated. There is no effective desalination method in the existing production methods, resulting in the precipitation of a large amount of salt substances when the product crystallizes, which affects the quality of the product. and yield, increasing the production cost of methionine

[0005] Patent 201310317849.2 "Method and device for removing impurities in secondary methionine mother liquor" discloses a method and device for removing impurities in secondary methionine mother liquor. The method uses diatomite, activated carbon or activated clay. The adsorption efficiency of these adsorbents is It is relatively low, and cannot be recycled through effective means after adsorption, causing secondary pollution to the environment, and is not suitable for industrial applications

Patent 201310194709.5 "A Production Process of Methionine" discloses a method for separating the methionine crystallization mother liquor. The methionine crystallization mother liquor is separated through a continuous chromatographic separation system filled with sodium-type or potassium-type chromatographic resins to obtain a methionine solution and an inorganic salt solution; This method is only suitable for the crystallization mother liquor with low methionine content, but it has not been verified and no effective solution has been proposed for the separation of high-content methionine solution and by-product salts in industrial production

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