A light-hydrocarbon mixture is to be separated by distillation as shown in Figure 10.37 into ethane-rich and propane-rich fractions. Based on the specifications given and use of the Soave-Redlich-Kwong equation for thermodynamic properties, use ASPEN PLUS with the RADFRAC distillation model to simulate the column operation. Using the results of the simulation with \(T_{0}=80^{\circ} \mathrm{F}\), a condenser refrigerant temperature of \(0^{\circ} \mathrm{F}\), and a reboiler steam temperature of \(250^{\circ} \mathrm{F}\), 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, \(\mathrm{kW}\), and \(\mathrm{Hp}\)

(d) Thermodynamic efficiency

Figure 10.37:-

Transcribed Image Text:

Feed: Slightly Superheated Vapor, 105F, 400 psia lbmol/hr 160.0 C2 370.0 C 240.0 nC4 25.0 Vapor Distillate Partial Condenser 530.00 lbmol/hr 2 7 Reflux: Saturated Liquid 1,000 lbmol/hr 400 psia Throughout Column 12 nC5 5.0 800.0 13 Partial Reboiler Liquid Bottoms 270.00 lbmol/hr Figure 10.37 Distillation process for Exercise 10.17.