METHOD OF EXTRACTING METHIONINE FROM CHEMICAL SYNTHESIS WASTES Russian patent published in 2010 - IPC C02F1/42 C02F103/36 

FIELD: chemistry.

SUBSTANCE: invention relates to methods of extracting methionine from waste water of organic synthesis and can be used in pharmaceutical, food and agriculture industry. The method involves treatment of waste water with 1n sulphuric acid to pH 1-2, ion-exchange sorption on a sulphocationite KU-5 in hydrogen form, subsequent desorption of methionine with simultaneous regeneration of the sulphocationite with 1% NaOH solution with addition of 25-30 g/l methionine at 70°C, crystallisation and filtration of crystalline methionine and drying. The method provides efficient extraction of methionine from waste and industrial water. The advantage of the method is elution of methionine and regeneration of the cationite in a single operation with NaOH solution with addition of methionine.

EFFECT: repeated use of acidic solutions and alkaline eluates together with the mother solution from filtration of crystalline methionine in process cycles enables to considerably cut amount of waste water and thereby improve environmental friendliness of production not only due to extraction of methionine but virtually pure sodium sulphate as well.

1 dwg, 1 ex