“…In the so called UNIFAC-free volume (UNIFAC-FV) [51] (also considered in references [16] and [50]), a third term, , introduced by Oishi and Prausnitz [56], is In order to calculate the combinatorial term, the required structural parameters R k and Q k (relative van der Waals, volumes and areas, respectively) for liquid (main groups 1 and 13, subgroups, 1, 2 and 26), and gases (main groups 57, 59, 60 68, 70, 71 72, 78, 80), were obtained from the data of Bondi [57] and are gathered in Table5.…”