Activity coefficients at infinite dilution of organic solvents in hydrofluoroparaffins

Fluorine compounds are finding more and more market opportunities such as speciality polymers in electrical, mechanical and chemical applications. For all these products the purification steps, both from solvents and from their own monomers are quite complex. The problem of fluorine compounds interacting with other molecules containing different functional groups must therefore be resolved. Little attention has thus far been given to studying the interaction between functional groups containing fluorine and other functional groups. In this paper the results of the measurement of infinite dilution activity coefficient data for mixtures containing hydro-fluoroparaffins and different organics are reported. By using the solution of group concept (UNIFAC model) it is possible, starting from these data, to characterize the interactions between the fluorine-containing groups and other organic groups. This characterization allows the prediction of thermodynamic behaviour even for mixtures for which experimental information is not available.