R. Vilcu et al., DEVIATIONS FROM IDEALITY IN ACETONITRILE PLUS AROMATIC-HYDROCARBONS BINARY-SYSTEMS, CALCULATED FROM LIQUID-VAPORS EQUILIBRIUM DATA, Revue Roumaine de Chimie, 38(2), 1993, pp. 151-165
In the view Of using acetonitrile as solvent or as raw material for sy
nthesis, the paper suggests its separation out of aromatic solutions,
in which it forms azeotrops. A systematic study of binary systems has
been made on the basis of various models of liquid state, e.g., Wilson
's equation, UNIQUAC and NRTL models. The processing of the experiment
al data existing in the literature on acetonitrile-benzene, acetonitri
le-toluene and acetonitrile-ethylbenzene systems as well as the author
's experimental data obtained for the acetonitrile-n propyl benzene sy
stem under izothermal conditions of 25.30, 35, 40, 45 and 50-degrees i
n an installation based on the static principle, which do not permit t
o obtaine complete data P = f(x,y), but only P = f(x), was studied. Th
e obtained data show that the Wilson's model correlates well the exper
imental data, the deviation of G(E)/RT being 3.5 X 10(-3) for K(ij) =
0.01. The maximum values of G(E)/RT are: 0.250 for the system acetonit
rile-benzene, 0.500 for acetonitrile-toluene and 0.554 for acetonitril
e-n-propyl benzene at 45-degrees-C. The influence of the -CH2-group on
the equilibrium data is noticed. When using UNIFAC equation, surpring
sly well values of the activity coefficients were obtained.