DEVIATIONS FROM IDEALITY IN ACETONITRILE PLUS AROMATIC-HYDROCARBONS BINARY-SYSTEMS, CALCULATED FROM LIQUID-VAPORS EQUILIBRIUM DATA

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.