Upper critical solution temperatures of mixtures containing sulphur hexafluoride

The upper critical solution temperatures, UCST, of a number of mixtures of simple organic substances, including C₅ to C₁₀ alkanes, with sulphur hexafluoride are reported. These UCST are analysed in terms of the one fluid model in order to estimate an interaction parameter, ξ, which is a measure of the strength of the interactions between sulphur hexafluoride+organic molecule. The values of ξ are discussed briefly.Several of the systems studied exhibited the barotropic phenomenon.