Temperature and chain-length dependence of the volumetric properties of 1-chlorobutane–alkane mixtures

Abstract

The excess volumes of 1-chlorobutane–n-alkane mixtures have been measured at several temperatures and over the entire composition range. The chain-length and the temperature dependence are non-monotonic, and might indicate the existence of structure-making and structure-breaking effects.

Two generalized van der Waals equations of state using a hard convex body-repulsive contribution have been used. The equations lead to satisfactory fits of the V^Evs. x curves, although they fail to predict the chain-length and temperature dependence. However, the pressure dependence of V^E for nC₆–nC₁₆ at 298.15 K is predicted satisfactorily.