FUNDAMENTALS OF VAPOR–LIQUID PHASE EQUILIBRIUM … FUNDAMENTALS OF VAPOR–LIQUID PHASE EQUILIBRIUM (VLE) Distillation occupies a very important position in chemical engineering. Distillation and ... Figure 1.6 Using Plot Wizard to generate xy diagram. 1.2 BINARY VLE PHASE DIAGRAMS 5. The other type of diagram, an xy diagram, is generated in Aspen Plus by clicking the ...