Isothermal vapor-liquid equilibria for 2-propanol + octane and 2-propanol + 2,2,4-trimethylpentane at 348.15 K

Isothermal vapor-liquid equilibria were measured for 2-propanol + octane and 2-propanol + 2,2,4-trimethylpentane at 348.15 K. The measurements were made in a Rogalski-Malanowski-type still with circulation of both vapor and liquid phases. Both binary isothermal systems form a maximum pressure azeotrope. The azeotropic data are x1(AZ) = 0.882 mole fraction and P(AZ) = 78.20 kPa for 2-propanol (1) + octane (2) and x1(AZ) = 0.637 mole fraction and P(AZ) = 6.24 kPa for 2-propanol (1) + 2,2,4-trimethylpentane (2). perimental data were checked for thermodynamic consistency by using three conventional tests. The activity coefficients of both systems were best correlated with the non-random two-liquid (NRTL) equation.