THERMODYNAMIC PROPERTIES FOR BINARY-LIQUID MIXTURES OF 1-CHLOROBUTANE + NORMAL-ALKANES

Isothermal compressibilities kappa-T and isobaric thermal expansion coefficients alpha-P have been measured at 25 and 45-degrees-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: (partial V(E)/partial T)P, -(partial V(E)/partial P)T, kappa-S(E), (partial H(E)/partial P)T, DELTA-(alpha-P-gamma-VT) and DELTA-C(V). The obtained results have been compared at 25-degrees-C with the calculated values by using the Prigogine-Flory-Patterson theory of liquid mixtures. The theory predicts the excess volume V(E) and -(partial V(E)/partial P)T values rather well, the C(P)E quite poorly, while for (partial V(E)/partial T)P, and (partial H(E)/partial 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 non-rigid 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.