Thermodynamic modeling of salt precipitation and gas hydrate inhibition effect of salt aqueous solution

Thermodynamic modeling of salt precipitation/solubility and hydrate inhibition effects of salt aqueous solutions are presented in this communication. A modified version of the Patel-Teja equation of state and nondensity-dependent mixing rules are used for modeling fluid phases. Salt is treated, in the equation of state, as a pseudo-component, similar to the other components in the system, by calculating its parameters from corresponding cation and anion parameters. A solid-liquid equilibrium theory is used for modeling equilibrium between precipitated salt and aqueous phase. The hydrate phase is modeled using the van der Waals-Platteeuw theory. The model predictions are compared with some selected experimental data reported in the literature on salt solubility and hydrate inhibition characteristics of salt aqueous solutions. The predictions through this model are found in acceptable agreement with the independent experimental data (not used in developing the model), demonstrating its convenient reliability.