Determination of liquid-liquid partition data for hydrazoic acid between tributylphosphate-alkane/nitric acid solutions using gas-liquid chromatography

The gas chromatographic technique of elution by characteristic point (ECP) has been used to determine partition data for HN, at finite concentrations with tributyl phosphate (TBP) in hydrocarbon (hexadecane) solution in the p resence of nitric acid and uranyl nitrate. The data are used to derive pred ictive equations for calculating gas-liquid and liquid-liquid partition coe fficients for varying temperature and varying concentrations of TBP, HNO3, UO2(NO3)(2), and HN3 in hydrocarbon solvents: simulating nuclear fuel repro cessing flow sheets. The chromatographically derived partition data present ed, being based on more precise measurements than were previously possible using conventional methods, allowed demonstration and quantification of the logarithmic temperature effect expected, but previously unobservable.