The Aggregation and Interactions of Tributyl Phosphate and Tricaprylmethylammonium Nitrate in Hexane by Osmometry

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Abstract
The dimerization constant of tributyl phosphate in hexane has been determined by vapor pressure osmometry and was found to be in agreement with the values in the literature obtained by infrared spectroscopy. The tributyl phosphate-tricapryl-methylammonium nitrate extractants strongly associate with each other. The addition of varying concentrations of tricaprylmethylammonium nitrate to a constant concentration of tributyl phosphate results in a linear relationship of the average degree of aggregation of the mixture with the initial concentration of tricaprylmethyl-ammonium nitrate. Varying the tributyl phosphate concentration results in a series of straight lines intersecting at one point. Extrapolation of the tributyl phosphate concentration to zero allows estimation of aggregation constants of tricaprylmethyl-ammonium nitrate in hexane by the linear regression technique.