Excess enthalpies at 45.deg., for ternary system acetonitrile-benzene-carbon tetrachloride

Excess free energies and entropies at 45.deg. for ternary system acetonitrile-benzene-carbon tetrachloride

“…For the binary systems involving acetonitrile, the values of TsE given here agree well with those given by Brown and Fock (4) for Xi > 0.5 but are several cal/g mol more negative for x-< 0.5. This is due to the (similar difference in) excess enthalpies (6) and not to the excess free energies, which are the same. The excess enthalpies used here are in better agreement with more recent data (7) for Xi < 0.5, the difference being about 2 cal/g mol, which would be reflected directly in TsE.…”

“…Excess enthalpies for the ternary system acetonitrilebenzene-carbon tetrachloride at 45°C have been reported previously (6). This is a system in which one component (acetonitrile) is highly polar and in which there is a pair of components (acetonitrile-carbon tetrachloride) which may serve as a cosolvent system in facilitating separations of hydrocarbons (5).…”

“…The excess entropy at 45°C obtained from Equation 8and the corresponding equation for /7123£ (6) The ternary plot for h123E has been given before (6), and similar plots for g123£ and 7s123£ are given in Figures 1 and 2, in which the values are calculated from Equations Figure 1 is similar to the corresponding plot for hE (6). The values are everywhere positive, and the largest values occur in the vicinity of the CH3CN-CCI4 binary system, and the smallest values in the vicinity of the CgHg-CCU system.…”

“…RT In h = ß = g123£ -x2 (dg123£/dx2)Z3 -X3 (dgi23£/dx3)4:2 (10) Similar expressions for 2 and 3 can be written by cyclic advancement of the subscripts (1 -*• 2 -* 3 -* 1). The effect of temperature on the activity coefficients and liquid-vapor equilibrium can be estimated by use of excess partial molar enthalpies similarly obtained from the excess enthalpies for the ternary system (6). The solvent 2-butanone is particularly useful for polar solutes which may not be appreciably soluble in nonpolar solvents.…”

“…Purification of the materials used was mainly by distillation, as described previously (6). BDH "Analar" acetonitrile was first dried and then fractionated twice over phosphorus pentoxide.…”