Figure 5.

Pressure–mole fraction diagrams of molecule pairs with dew and boiling lines at cell temperature (black line) and evaporation temperature (purple line). Additionally, the saturation pressure of species B at evaporation temperature p_sat,B (T_evap) (purple dotted line) and the saturation pressure of species A at cell temperature p_sat,A (T_cell) (black dotted line) are displayed. Green circles indicate the process states. The pressure difference Δp_pf is highlighted in orange (left, negative value) and blue (center and right, positive value) and increases from left to right. Left: infeasible process for zeotropic mixtures. Center and right: feasible processes.