In this study, the constant volume, visual method is used to measure the critical point of CO_(2)+toluene, CO_(2)+cyclohexane, CO_(2)+n-butyraldehyde, CO_(2)+i-butyraldehyde, CO_(2)+methanol and CO_(2)+alcohol binary systems. The relationship between critical point and the concentration of the entrainer for different substances has been discussed, and the comparison of the phase behavior of single component system and that of binary systems have been carried out.
