The isobaric vapor-liquid equilibrium data of the tetraethyl orthosilicate and ethanol binary mixture were collected using a modified Othmer still at pressures of 24.00 kPa and 53.32 kPa. The experimental data showed that this mixture could be separated by a distillation process at lower temperatures under pressures of 24.00 kPa and 53.32 kPa than under atmospheric pressure. The experimental data were examined with the Herington thermodynamic consistency test and the χ 2 distribution of statistics. They are fairly well correlated with the UNIQUAC model. Also, the optimum interaction parameters of the UNIQUAC model were determined by the maximum likelihood principle.
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