A newly proposed united-atom force field is used to predict the phase
behavior of binary mixtures of long and short alkanes over wide ranges
of temperature and pressure. Given the chemical similarity of the com
ponents, no adjustable binary parameters are introduced. In general, a
greement with experiment is satisfactory. Two commonly used equations
of state are also used to describe experimental coexistence curves. In
the absence of binary data, it is found that molecular simulations pr
ovide a fairly reliable means of estimating thermodynamic properties f
or the highly asymmetric mixtures of short and long alkanes studied in
this work.