Abstract
Isothermal vapor-liquid equilibrium (VLE) data were measured for the mixtures n-pentane/propionaldehyde, n-heptane/n-butyraldehyde, and isobutyraldehyde/n-heptane at low pressures (100-1000 mmHg) by using a dynamic still. The data reported here are thermodynamically consistent according to the point-to-point consistency test. These data are correlated with five activity coefficient models with parameters estimated from the maximum likelihood method. Also, UNIFAC parameters were estimated for the aldehyde/hydrocarbon functional-group interactions based on the new data.
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