Vapor PVT and Vapor Pressure of Hydrogen Fluoride

Pressure-volume-temperature (PVT) data on hydrogen fluoride (HF) were measured from (293 to 473) K and from low pressure to near saturation pressure. These data were compared to existing literature data, and a model was developed which accurately represents the association behavior of pure, gaseous hydrogen fluoride. This model includes the assumption of HF dimers and hexamers in equilibrium with monomeric HF. The vapor pressure of hydrogen fluoride was also measured from (293 to 454) K, and these measurements were correlated using the Riedel equation. There is good agreement between these vapor pressures and previous work, while this work extends the measured vapor pressure for HF to within 7 K of the critical temperature.