9887

Computation of Tie Lines for Ternary Mixtures

Consider a ternary mixture of hexane, heptane, and methanol. A temperature of 32.85 °C is assumed. This liquid-liquid equilibrium diagram is classified as type II. The Demonstration computes the tie line originating from a user-specified position on the extract curve (i.e., known values of for are assumed). In effect, one has to find the steady-state solution of the following system of ODEs:
for , where is the mole fraction of component in phase (hexane-rich or hexane-lean phases) and is the activity coefficient of component in phase predicted using the non-random two liquid (NRTL) model.

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