A mixture of three hydrocarbons is to be separated into three nearly pure products by thermally coupled distillation at \(1 \mathrm{~atm}\) as shown in Figure 10.38.

Based on the specifications given and other specifications of your choice to achieve reasonably good separations, together with use of the Peng-Robinson equation for thermodynamic properties, use ASPEN PLUS with the MULTIFRAC distillation model to simulate the column. Using the results of the simulation with \(T_{0}=100^{\circ} \mathrm{F}\), calculate the following:

(a) Irreversible production of entropy, \(\mathrm{Btu} / \mathrm{hr}-{ }^{\circ} \mathrm{R}\)

(b) Change in availability function in \(\mathrm{Btu} / \mathrm{hr}\)

(c) Lost work in Btu/hr, kW, and \(\mathrm{Hp}\)

(d) Thermodynamic efficiency

Figure 10.38:-

Transcribed Image Text:

Feed 70 mol% Vaporized Ibmol/hr nC6 40 nCs 30 nC10 30 100 Figure 10.38 Thermally coupled distillation process for Exercise 10.18. 100F CW 100F Steam 425F 425F Distillate 40.0 lbmol/hr Liquid Side Stream 30.0 lbmol/hr 30.0 lbmol/hr