7-35 No. 6

A mixture of hydrocarbons (10 mol% methane, 20 mol% ethane, 30% mol% propane, 15 mol% isobutane, 20 mol% n-butane, and 5 mol% n-pentane) is flashed into a separator at 80°F and 150 psia. Fifty percent of the mixture leaves as a liquid. What is the composition of the liquid? Equilibrium constants are as follows:

CH4 = 17.0     C2H6 = 3.1    C3H8 = 1.0

i-C4H10 = 0.44     C4H10 = 0.32 C5H12 ₌ 0.0986