Abstract
An explanation is presented for the extraction of excess nitric acid and water by trilaurylamine nitrate in dodecane, xylene and chlorobenzene. Applying the computer Fortran IV-MIN program to a series of three successive extractions, a best fitting curve to the experimental data has been obtained. Although the amount of nitric acid per amine molecule steadily increases, water is replaced from the amine nitrate molecule by the first excess nitric acid uptake and next coextracted to a limiting amount when additional excess acid is bound. The acceptable description of the excess acid and water extraction is based on the aggregation of the amine nitrate species. By vpl (vapour pressure lowering) an average value of ι = 1·6 in chlorobenzene and ι = 2·3–3·3 in o-xylene have been measured, these values being independent of the aqueous nitric acid concentration between 1 2 and 6 M. It was found that the species finally formed in all solvents have the same average composition. An indication of the gross composition of the main species formed in chlorobenzene, xylene and dodecane has been given.
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