Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

ABSTRACT

The solubility of gaseous vinyl fluoride (VF) was measured in Lithium Bis(trifluoromethylsulfonyl)imide (Li+Tf2N-) + water (H2O) solutions at salt compositions on a solute (VF) free basis of 20.15, 40.0, and 80.0 wt.% at isothermal conditions of approximately 283 K, 304 K, and 372 K using a volumetric view cell. The experimental results demonstrated that vinyl fluoride is highly soluble in aqueous Li+Tf2N- salt solutions and that solubility is directly proportional to salt loading with the greatest VF solubilities (x_VF = ~ 0.0629) observed in samples containing 80.0 wt.% Li+Tf2N-. The experimental phase equilibrium results were successfully modeled by a standard Peng Robinson equation of state which utilized a van der Waals 1-parameter mixing rule and four binary interaction parameters (two temperature dependent and two temperature independent). The absolute average deviation (AAD) in pressure between experimental and regressed data was 1.71% indicating the excellent model fit. The significant thermodynamic vinyl fluoride sorption capacity of Li+Tf2N- + H2O solutions indicate their potential to be utilized as improved solvents for poly(vinyl fluoride) polymerization reactions.