Isothermal vapor-liquid equilibria for methyl-2,2-dimethylethyl ether plus2-methylpropan-2-ol, diethyl ether plus ethyl-2,2-dimethylethyl ether, 2-methyl-2-butene plus (2-methylbutan-2-ol), and diisopropyl ether plus octane

Isothermal vapor-liquid equilibrium data for four binary systems methyl-2,2 -dimethylethyl ether + 2-methylpropan-2-ol, diethyl ether + ethyl-2,2-dimet hylethyl ether, 2-methyl-2-butane + 2-methylbutan-2-ol, and diisopropyl eth er + octane were collected at two temperatures using a modified Malanowski still. The virial equation truncated at the second virial coefficient was u sed to calculate the vapor-phase fugacity coefficients. The liquid-phase ac tivity coefficient data were fitted to the van Laar, Wilson, and NRTL equat ions.