# SOL-A1-2017 - ECH 152B Winter 2017 Roland Faller Solution...

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ECH 152B, Winter 2017, Roland Faller Solution for Homework Aspen 1, January 27, 2017 Due: February 10, Beginning of Discussion (or upload on Canvas as a single File, PDF preferred) 1. (15 = 5+5+5 points) Assume a mixture of (overall) 5 mol% ethane, 5 mol% propane, 40 mol% butane and the rest isobutane at a temperature of T = 310 K. 20 mol% of the system are in the vapor phase. (a) Determine the pressure and the compositions of the two phases ”by hand”.
(b) Redo part (a) using AspenPlus (R) for three different (non-ideal) equations of state. Compare the results and discuss them. (c) Use AspenPlus to calculate the Gibbs free energy of mixing for all (six) binary mixtures as a function of concentration at the temperature and pressure you obtain in part (b). Compare to ideal mixing values at the same temperature. Solution (a)
1.) b.) common: Redlich:
RED/HEN: C.)
Ideal:
RTOSRK:
SRK:
VTPR: