Determine, by the Kremser method, the achievable separation for the absorber in Figure 9.26 for the following conditions: 

(a) Six stages and 75-psia pressure, 

(b) Three stages and 150-psia pressure, and 

(c) Six stages and 150-psia pressure. What do you conclude?

Feed 130 kPa 165 kPa kmol/h Benzene 260 80 Toluene Biphenyl 5 200 kPa Vapor side stream 180 kPa Steam Distillate Bottoms Figure 9.22 Data for Exercise 9.5. Benzene Toluene kmol/h 3 79.4 Biphenyl 0.2 Benzene Toluene kmol/h 257 Toluene Biphenyl kmol/h 0.5 4.8 0.1