Abstract
The association of fatty acids with their potassium salts has been studied for the even carbon number acids C 4 to C 13 and for valeric acid. Mixtures of acid and soap were prepared by a dry-melt technique followed by careful tempering. Differential thermal, X-ray, and infrared analysis indicates in all cases the formation of well-defined 1:1 acid-soap complexes identical, or very close in properties, to those made via a solvent preparative technique. At least three different crystalline phases of acid-soaps have been confirmed, the particular phase being determined both by chain length and source of fatty acid. Acid-soap formation is also shown to take place with the unsaturated oleic and elaidic acids.
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