For this question I am using Ethanol as an example. The following is the vapor-liquid equilibrium diagram for Ethanol under atmospheric pressures.
Under reduced pressures do the number of theoretical separations decrease for a given system? Ethanol for example needs approximately 14 separation "plates" to achieve the azeotrope.
From my understanding wouldn't this only break the azeotrope and allow separation to a higher purity? Ex. Vacuum operation doesn't increase the efficiency as far as theoretical required separations go. (Vacuum Operation Plates == Atmosphereic Operation Plate)
Note: For the purposes of this question efficiency is in reference to the number of theoretical plates, and not the total heat required to obtain the pure product.