Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

ABSTRACT

Using a static analytic method, experimental solubility data were obtained for tetra(5,5-dimethyl-1,3-dioxaphosphorinanyl-2-oxy) neopentane (DOPNP) in acetonitrile, acetone, methanol, ethanol, ethyl acetate, methyl acetate and methylethylketone at temperatures ranging from 293 to 333 K. Several commonly used thermodynamic models, including the ideal, modified Apelblat, Wilson, UNIQUAC and NRTL models, were applied to correlate the experimental solubility data. The binary interaction parameters of the above models were found to have a linear dependency on temperature and the coefficients were regressed. It can be seen that NRTL model is more suitable in describing the solubility data of DOPNP, compared with the other models. By using the van t Hoff equation, the dissolution enthalpy, dissolution entropy, and Gibbs free energy change of DOPNP are predicted in different pure solvents.