Abstract: Apre-saturator would be added for the gas stripping method to maintain the amounts of the solvent if it was a high-volatile substance.The infinite dilution activity coefficients of three acetone-cycloalkane systems:acetone-methyl cyclopentane, acetone-cyclohexane, acetone-methyl cyclohexane have been determined in the 298.2-318.2 Ktemperature region.Linear dependence of Inγ^∞ on₁/Tis found for all systems, and the temperature parameters are in the order:cyclohexane<methyl cyclopentane<methyl cyclohexane.Furthermore, the experimental results are used to predict the whole range VLE.The results show that Wilson equation gives the best fit to literature data.

Key words: Acetone-cycloalkane system, Infinite dilution activity coefficient, Gas stripping method