Vapor-liquid equilibrium data at atmospheric pressure for the systems glycerol-water and glycerol-water saturated with sodium chloride were determined in an improved Othmer still. The binary mixtures and salt-saturated solutions were analyzed by refractive index measurements. The equilibrium data for the glycerol-water system were thermodynamically consistent when tested by Herington's method.apor-liquid equilibrium data for the systems glycerolwater and glycerol-water saturated with sodium chloride are of theoretical and industrial importance. Several industrial processes yield glycerol, sodium chloride, and water (4, 12). Adequate knowledge of the vapor-liquid equilibrium data for these systems is useful. Although boiling point-composition data for both systems have been reported (1, 14), it is difficult to predict their vapor-liquid equilibria because of the highly nonideal behavior of the systems, and experimental determinations are necessary. EXPERIMENTAL rated with sodium chloride at 20°C. Salt content was determined by titration against standard silver nitrate ( 14). Refractive indices of the salt-saturated solutions were then determined at 20°C and a calibration curve for the system was

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