FIELD: chemistry.
SUBSTANCE: described is a method of producing a concentrate of anthocyan dye from aqueous solutions through extraction with an organic reagent - water-soluble poly-N-vinylcaprolactam in amount of 0.1-0.5 wt % of the initial solution, a salting-out agent - sodium chloride in amount of 26.5 wt % of the initial solution. The organic phase is heated to 32-37°C and the dye concentrate is separated from the precipitated poly-N-vinylcaprolactam.
EFFECT: increased purity of the obtained concentrate of anthocyan dye which is free from the organic reagent, with reduction of the cost of the end product.
1 cl, 2 ex
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