VAPOR-PRESSURES OF BINARY-MIXTURES OF CARBON-DIOXIDE WITH BENZENE, N-HEXANE AND CYCLOHEXANE UP TO 7 MPA

The total vapor pressures of three CO//2-C//6 hydrocarbon systems; CO//2-benzene, CO//2-n-hexane, and CO//2-cyclohexane systems, have been measured at 273. 15, 283. 15, 298. 15 and 303. 15 K over the whole composition range by a bubble point method. For the CO//2-n-hexane system, the densities of the liquid mixtures have also been measured. From the data and the calculated results by the Peng-Robinson equation of state, the activity coefficients of CO//2 and the Henry's constants of CO//2 in CO//2-C//6 hydrocarbon systems have been obtained. The vapor pressure data have been compared with the results calculated by the Barker's method and by the Peng-Robinson equation of state with the use of four mixing models.