Influence of Nonvolatile Solute on Boiling Point of Azeotrope

The influence of 10 nonvolatile solutes on boiling point of methanol-tetrahydrofuran azeotrope was determined by means of isobaric vapor-liquid equilibrium experiments. Based on classical thermodynamics a conclusion of universal significance was derived, i. e. , a little nonvolatile solute always causes the elevation of azeotrope's boiling point irrespective of the variation of its vapor composition. It is in agreement with the experimental results and the relevant reports in the literature without exception.