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)...

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