The critical temperatures and critical pressures of binary mixtures of aliphatic hydrocarbons

Abstract

AbstractExperimental critical temperatures and critical pressures presented in the literature for binary aliphatic hydrocarbon systems have been utilised to obtain the excess critical temperature, Tc—T′c, and the excess critical pressure, Pc—P′c, for reported compositions of these binary systems. Besides composition, these excess quantities were found to depend on α, the critical temperature parameter, and β, the critical pressure parameter.Because of the different behaviour associated with the methane‐containing binaries, these systems were treated separately. The final correlations of these excess critical quantities for non‐methane systems produced an average deviation of 0.46% for critical temperature and 2.30% for critical pressure for 63 experimental values considered; for the methane‐containing binary systems, the corresponding correlations produced a deviation of 0.93% for critical temperature and 1.10% for critical pressure from 36 experimental values.