D7. We are separating a mixture of ethane, propane, n-butane and n-pentane in a distillation column operating at

5.0atm

. The column has a total condenser and a partial reboiler. The feed flow rate is

1000.0kmo(l)/(h)

. The feed is a saturated liquid. Feed is

8.0mol%

ethane,

33.0mol%

propane, 49.0

mol%n

-butane and

10.0mol%n

-pentane. A

98.0%

recovery of propane is desired in the distillate. A 99.2% recovery of n-butane is desired in the bottoms. Use the optimum feed stage. Use DePriester chart. Assume relative volatility is constant at value calculated at the bubble point temperature of the feed.\ a. Find

N_(min)

from the Fenske equation.\ b. Find

((L)/(D))_(min)

from the Underwood equation.\ c. Use

(L)/(D)=1.2((L)/(D))_(min)

and estimate

N

and

N_(Feed )

from Gilliland correlation.

D7. We are separating a mixture of ethane, propane, n-butane and n-pentane in a distillation column operating at 5.0atm. The column has a total condenser and a partial reboiler. The feed flow rate is 1000.0kmol/h. The feed is a saturated liquid. Feed is 8.0mol% ethane, 33.0mol% propane, 49.0 mol% n-butane and 10.0mol%n-pentane. A 98.0% recovery of propane is desired in the distillate. A 99.2\% recovery of n-butane is desired in the bottoms. Use the optimum feed stage. Use DePriester chart. Assume relative volatility is constant at value calculated at the bubble point temperature of the feed. a. Find Nmin from the Fenske equation. b. Find (L/D)min from the Underwood equation. c. Use L/D=1.2(L/D)min and estimate N and NFeed from Gilliland correlation