Isothermal vapor−liquid equilibrium of the six binary systems 2-propanone + n-butane, + 2-methylpropane, +
1-butene, + cis-2-butene, + 2-methylpropene, + trans-2-butene were measured from (364.1 to 365.46) K with
an automated static total pressure apparatus. Measured pTz data was reduced into pTxy data using the Barker
method. Error analysis was conducted for all measured and calculated data. All measured systems exhibited
positive deviation from Raoult's law, and an azeotropic point was found for the n-butane + 2-propanone system.
Parameters of Wilson and UNIQUAC activity coefficient models were regressed with the experimental VLE
data. Results obtained with two predictive methods, UNIFAC and COSMO-RS, were compared with measured
data.
Isothermal VLE for six binary systems 1-propanol + 1-butene, + cis-2-butene, + 2-methyl-propene, +
trans-2-butene, + n-butane, and + 2-methyl-propane was measured from (318.6 to 331.9) K with a static
total pressure apparatus. The Barker method was used to calculate the concentrations of vapor and liquid
phases from measured pressure and the total amounts of components injected into the measurement
cell. Error analysis was conducted for measured pTz data. Binary interaction parameters were optimized
for the Legendre polynomial, Wilson, and UNIQUAC activity coefficient models. Interaction parameters
for the relatively new UNIQUAC association model were also fit. Good agreement was found between
literature VLE data and values measured in this work. The performance of the UNIQUAC association
model was found to be better than that of the traditional UNIQUAC model for all measured mixtures.
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