Three-Liquid Phase Equilibria in Water + Benzene + Caprolactam + (NH_4)_2SO_4 Mixtures

摘要

Liquid-liquid-liquid equilibrium (LLLE) data are reported for the water + benzene + caprolactam + ammonium sulfate system at 293.1 K, 313.1 K, and 328.1 K. The experiments show a distinct pattern of phase behavior with increasing salt concentration and temperature. The tricritical point of the system was not determined, but was estimated to be around 332 K. The results are modeled using a modification of the extended electrolyte NRTL model. The model was able to represent the LLLE data satisfactorily.