We have a feed that is a binary mixture of methanol and water (55.0 mol% methanol) that is sent to a system of two flash drums hooked together. The vapor from the first drum is cooled, which partially condenses the vapor, and then is fed to the second flash drum. Both drums operate ata pressure of 1.0 atm and are adiabatic. The feed rate to the first drum is 1000 kmol/h. We desire a liquid product from the first drum that is 30.0 mol% methanol (x1 = 0.30). The second drum operates at a fraction vaporized of (VF)2 0.25. The equilibrium data are in Table 2-7, A. Sketch the process labeling the different streams.
B. Find the following for the first drum: vapor mole fraction y fraction vaporized (VF), and vapor flow rate Vi
C. Find the following for the second drum: vapor mole fraction y2, liquid mole fraction x and vapor flow rate V2.
Methanol liquid Methanol vapors Temperature 0C
0 0 100
2 13.4 96.4
4 23.0 93.5
6 30.4 91.2
8 36.5 89.3
10 41.8 87.7
15 51.7 84.4
20 57.9 81.7
30 66.5 78.0
40 72.9 75.3
50 77.9 73.1
60 82.5 71.2
70 87.0 69.3
80 91.5 67.6
90 95.8 66.0
95 97.9 65.0
100 100.0 64.5