Both vapor-liquid equilibria and boiling temperatures have been measured for the ternary system acetonitrile-acrylonitrile-water under a constant total pressure of 760 mm.of Hg and for the corresponding binaries acrylonitrile-acetonitrile and acetonitrilewater. Experimental values are presented in tabular form and are shown graphically for convenience in interpolating. Of the three binaries, acrylonitrile and acetonitrile behave almost as ideal solutions, acetonitrile and water form a minimum boiling azeotrope, while acrylonitrile and water are partially miscible and form a heterogeneous azeotrope. The ternary mixture at its boiling point is immiscible at low acetonitrile concentration, but becomes miscible at higher acetonitrile concentrations. Activity coefficients were calculated from the experimental measurements and qualitatively checked for consistency according to suggestions in the literature. The equilibria presented are believed to be reliable and should be useful in the design of fractionation equipment for these mixtures.FROM propylene, ammonia, and air the Sohio process (4) produces acrylonitrile, some acetonitrile, and relatively large quantities of water. Several other proposed processes for acrylonitrile produce acetonitrile and water, but in different amounts. Hence the recovery and purification of the desired acrylonitrile product require separation of acetonitrile-acrylonitrile-water mixtures. If this separation is carried out by fractionation, the optimum design and successful operation of the towers depend upon having reliable vapor-liquid equilibria for these mixtures.Vapor compositions in equilibrium with the liquid at its boiling points under 760 mm. of Hg. pressure were measured for acetonitrile-acrylonitrile-water mixtures. The
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