Using the extractants such as naphthenic acid-sec-octyl alcohole and P204-sec-octyl alcohol- proved the formation of a W/O microemulsion in the saponified extractant. In this paper, the authors studied the above-mentioned systems by titration calorimetry. From titration thermogram, the existence of two states of water, bound water and free water, were demonstrated. According to a sketch of the suggested structure of the microemulsion, the size parameters of the microemulsion have been evaluated.

Key words: AMMONIUM COMPOUND, WATER, SODIUM, POTASSIUM, OCTANOL P, EXTRACTION SYSTEM, KEROSENE, NAPHTHENIC ACIDE, DI(ETHYLHEXYL) PHOSPHORIC ACID, OIL-WATER INTERFACE