METHOD OF EXTRACTING LACTIC ACID FROM FERMENTATION SOLUTIONS Russian patent published in 2014 - IPC C07C59/08 C12P7/56 C07C51/48 C07C51/487 

FIELD: chemistry.

SUBSTANCE: invention relates to bioengineering of food products and can be used in processing fermentation solutions to obtain lactic acid. The method of extracting lactic acid from fermentation solutions involves extracting lactic acid with a salt of a quaternary ammonium base in a diluenet and re-extracting the acid, wherein extraction is carried out with a salt of a quaternary ammonium base in sulphate form [(R₄N)₂SO₄], where R is an alkyl or aryl radical, in the presence of p-tertiary alkylphenols in molar ratio of (R₄N)₂SO₄ to p-tertiary alkylphenols of 1:2, at solution pH 5.0-7.0; the acid is re-extracted with sodium hydroxide solutions and the extractant is regenerated via treatment with a stoichiometric amount of sulphuric acid.

EFFECT: high degree of extraction of lactic acid from fermentation solutions and preventing the chloride ion from falling into the aqueous phase after extraction.

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