A new method for phase equilibrium measurements in reacting mixtures

Abstract:
We propose a new principle for phase equilibrium measurements where zero net mass ux over the phase boundary is obtained even at chemical non-equilibrium. Thus, physical equilibrium can be guaranteed irrespective of (potentially slow) mass transfer. We have used this principle for the experimental determination of vapor-liquid-equilibria (VLE) for a reactive transesteri cation system in a new type of flow-through still where compositions of both phases are observed in situ by infrared spectroscopy toavoid disturbance of the steady state. The design circumvents limitations of conventional apparatus and allows measurements for promising but demanding applications like reactive distillation.

Keywords:
Experimental method, Vapor-liquid equilibria, Reactive systems, Spectroscopy, Mixture.

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