Thermodynamic properties for binary liquid mixtures of 1-chlorobutane+n-alkanes

Isothermal compressibilities K and isobaric thermal expansion coefficients _p have been measured at 25 and 45°C for pure components and the following binary mixtures: 1-chlorobutane+normal alkanes (n-C_n) where n=6, 8, 10, 12, 14 and 16. With these results and other thermodynamic data from literature the next mixing quantities have also been reported: (V^E/T)_P, – (V)^E/P)_T, K_S^v, H^E/P)_T, (_pVT and C_v. The obtained results have been compared at 25°C with the calculated values by using the Prigogine-Flory-Patterson theory of liquid mixtures. The theory predicts the excess volume V^E and V^E/P)_T values rather well, the C_P^E quite poorly, while for V^E/T)_P and V^E/P)_T it is only predicted the trend with the chain length of the n-alkane. The last two quantities show deviations between theoretical and experimental, slightly higher in systems with longer n-alkanes than for shorter ones. Our conclusion is that a nonrigid linear molecule, like 1-chlorobutane, has a low ability as a breaker of the pure n-C_n orientation correlations, in between that which we found for toluene and p-xylene and much smaller than for cyclohexane or benzene.