We are separating a mixture of methanol and water in a flash drum at 1 atm pressure. Equilibrium data are listed in Table 2-8.

a. Feed is 60.0 mol% methanol, and 40.0% of the feed is vaporized. What are the vapor and liquid mole fractions and flow rates? Feed rate is 100.0 kmol/h.

b. Repeat part a for a feed rate of 1500.0 kmol/h.

c. If the feed is 30.0 mol% methanol and we desire a liquid product that is 20.0 mol% methanol, what V/F must be used? For a feed rate of 1000.0 lbmol/h, find product flow rates and compositions.

d. We are operating the flash drum so that the liquid mole fraction is 45 mol% methanol. L = 1500.0 kmol/h, and V/F = 0.20. What must the flow rate and composition of the feed be?

e. Find the dimensions of a vertical flash drum for Problem 2.D1c. Data: P_w = 1.00 g/cm³, P_m,L = 0.7914 g/cm, MW_W 18.01, MWm = 32.04. Assume vapors are ideal gas.

f. If z = 0.40, p = 1.0 atm, and T_drum = 77.0C, find V/F, X_m, and Y_m.

Transcribed Image Text:

TABLE 2-8. Vapor-liquid equilibrium data for methanol water (p = 1 atm) (mol %) Methanol Liquid Methanol Vapor Temp., C 0 0 100 20 2.0 13.4 96.4 4.0 23.0 93.5 6.0 30.4 91.2 8.0 36.5 89.3 10.0 41.8 87.7 15.0 51.7 84.4 20.0 57.9 81.7 30.0 66.5 78.0 40.0 72.9 75.3 50.0 77.9 73.1 60.0 82.5 71.2 70.0 87.0 69.3 80.0 91.5 67.6 90.0 95.8 66.0 95.0 97.9 65.0 100.0 100.0 64.5