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9.9 A binary mixture of isopropanol (1) and n-pentanol (2) is to be separated by a two-stage flash operation as follows: A liquid mixture containing 90 mol% isopropanol enters the first stage with a flow rate of 60 mol/min. The flash drum operates at 313.5 K and 8 kPa. The liquid stream leaving the first stage is sent to the second stage operating at 313.5 K. The liquid and vapor streams leaving the second stage have equal flow rates. Using the pressure-composition data provided below (Mara et al., 1997), determine: (a) The compositions of the streams leaving the first stage. (b) The operating pressure as well as the compositions of the streams leaving the second stage. X1 P (kPa) X1 0.0000 0.0323 0.0613 0.1322 0.1491 0.2004 0.2511 0.3010 0.889 0.3521 1.311 0.4021 1.681 0.4523 2.596 0.5022 2.816 0.5533 3.484 0.6027 4.129 0.6031 4.780 0.6524 P (kPa) x1 P (kPa) 5.454 0.7020 10.017 6.103 0.7517 10.598 6.755 0.8014 11.292 7.406 0.8516 11.966 8.067 0.9019 12.587 8.713 0.9412 13.134 8.710 0.9722 13.527 9.371 1.0000 13.872 (Answer: (a) x1 = 0.55, y = 0.95 and (b) P = 4 kPa, xi = 0.25, Y=0.85) 9.9 A binary mixture of isopropanol (1) and n-pentanol (2) is to be separated by a two-stage flash operation as follows: A liquid mixture containing 90 mol% isopropanol enters the first stage with a flow rate of 60 mol/min. The flash drum operates at 313.5 K and 8 kPa. The liquid stream leaving the first stage is sent to the second stage operating at 313.5 K. The liquid and vapor streams leaving the second stage have equal flow rates. Using the pressure-composition data provided below (Mara et al., 1997), determine: (a) The compositions of the streams leaving the first stage. (b) The operating pressure as well as the compositions of the streams leaving the second stage. X1 P (kPa) X1 0.0000 0.0323 0.0613 0.1322 0.1491 0.2004 0.2511 0.3010 0.889 0.3521 1.311 0.4021 1.681 0.4523 2.596 0.5022 2.816 0.5533 3.484 0.6027 4.129 0.6031 4.780 0.6524 P (kPa) x1 P (kPa) 5.454 0.7020 10.017 6.103 0.7517 10.598 6.755 0.8014 11.292 7.406 0.8516 11.966 8.067 0.9019 12.587 8.713 0.9412 13.134 8.710 0.9722 13.527 9.371 1.0000 13.872 (Answer: (a) x1 = 0.55, y = 0.95 and (b) P = 4 kPa, xi = 0.25, Y=0.85)