To produce high-purity gondoic acid highly purified by a simple process by using a fatty acid mixture containing gondoic acid as a raw material.
(A) A fatty acid mixture containing gondoic acid and urea are dissolved in an organic solvent and cooled. The precipitated crystal is separated and removed. (B) The solution of the organic solvent is mixed with water and the formed oil layer is separated and recovered. Or (D) urea is dissolved in the solution of the organic solvent and cooled and the precipitated crystal is collected. The crystal is mixed wit water to give an oil layer, which is separated and recovered. (C) The oil layer thus separated and recovered is dissolved in a polar solvent, partially neutralized and cooled. The precipitated crystal of the acidic salt of the fatty acid is collected and is decomposed with an acid to produce high-purity gondoic acid.
KIDERA YOSUKE
SUZUKI MASAO
