Second virial coefficients of normal alkanes, linear 1-alkanols and their binaries

Abstract

The extensive 1986 analvsis of Dymond et al. for normal alkanes is expanded to include recent data on butane, pentane, and hexane. It now appears that the Hayden-0‘Connell or the Tsonopoulos correlation may be used for T < 0.65 Tc, while the Tsonopoulos correlation is better for T > 0.65 Tc. The reanalysis also suggests that the original McCann-Danner group-contribution method should be used in place of the modifications proposed by Dymond et al. Consideration is also given to extrapolation to nonane and heavier normal alkanes. Preliminary recommendations are made for the second virial coefficients of methanol, ethanol, 1-propanol, and 1-butanol. Analysis of the IUPAC database with the correlation of Tsonopoulos suggests that the 1974 recommendations need to be modified only for methanol: the value b - 0.064 should replace the earlier choice (b - 0.056). Extrapolation to pentanol and heavier linear 1-alkanols is at present uncertain. The 1979 recommendations of Tsonopoulos for the second virial cross-coefficients of alkane/alkane and alkane/1-alkanol binaries are generally supported by recent data. However, more, high-quality data are needed for C4+ linear 1-alkanols and their binaries to develop an improved corresponding-states or a group-contribution method. © 1989, Walter de Gruyter. All rights reserved.