FIELD: chemistry.
SUBSTANCE: invention refers to a method for purifying fatty acid containing 1 to 6 unconjugated unsaturation centres, involving: (a) adding a reaction with fatty acid containing 1 to 6 unconjugated unsaturation centres with lithium salts in a first solution and in the environment enabling fatty acid lithium salt sedimentation; (b) precipitation; (c) deposit dilution in the second solution which is able to form two unmixible layers when resolving the precipitate; the above two unmixible layers represent an organic layer and an aqueous acid layer; (d) dividing the two unmixible layers formed after the deposit dilution; and (e) evaporation of the organic layer for recovering purified fatty acid, wherein a method for purification is free from dividing fatty acids.
EFFECT: invention refers to a method for producing fatty acid containing 1 to 6 unconjugated unsaturation centres, and to a method for increasing a length of fatty acid.
13 cl, 2 ex
