2442. ---------------. [NEWEY, H. A., SHOKAL, E. C., MUELLER, A. C., BRADLEY, T. F., AND FETTERLY, L. C.] Separation of Fatty Acids and Their Derivatives by Extractive Crystallization With Urea. Am. Paint Jour., vol. 34, May 1, 1950, pp. 76-78; Chem. Zentralb., 1951, I, p. 1662.
When fatty acids are mixed with saturated, aqueous, or alcoholic solutions of urea, the more-saturated components form complex insoluble compounds which can be separated by filtration. There remains behind a raffinate of high I number. The method is cheap, operable at room temperature, and useful for separating the alcohols and nitriles of fatty acids.