Henry’s constants of butane, isobutane, 1-butene and isobutene in methanol at 255–320 K

Abstract The Henry’s constants and the infinite dilution activity coefficients of butane, isobutane, 1-butene and isobutene in methanol at 255–320 K are measured by a gas stripping method. The rigorous formula for evaluating the Henry’s constants from the gas stripping measurements is proposed for these highly volatile mixtures. By using this formula, a volume effect of vapor phase and the effect of nonideality of fluids are discussed. In the evaluations for activity coefficients the nonideality of solute was not negligible especially at higher temperatures. The values of Henry’s constants of butane are much different from those of isobutane, while the activity coefficients are not so different to each other. The activity coefficients of butane are about 2.5% greater than those of isobutane, and those of 1-butene are about 4% greater than those of isobutene.