A new continuous dilution vapor liquid equilibrium apparatus: The activity coefficients of benzene and water in cyclohexane at 50°C

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A semi-automated apparatus to measure vapor pressure differences between a reference solvent and dilute solutions as a function of concentration at constant temperature is described. Application to the benzene-cyclohexane and benzene-cyclohexane-water systems at high cyclohexane concentrations and low water concentrations is reported. At 50°C in the two component mixture we find lnγB=ln(f B/X B f B 0 )=0.408−0.89XB for 10−3<X B <3×10−2 and in the three component system, lnγW=6.79±0.04 for 10−6<X W <2×10−5 and 10−3<X B <3×10−2.