The feed to a depropanizer operating at 250 lb /in. 2 contains 6 percent ethane, 41

The feed to a depropanizer operating at 250 lb_ƒ/in.² contains 6 percent ethane, 41 percent propane, 28 percent i-butane, 23 percent n-butane, and 2 percent n-pentane (all in mole percent). 

(a) If 98 percent of the propane is recovered in the distillate and 98 per- cent of the i-butane in the bottoms product, what are the compositions of the distillate and bottoms? 

(b) Use the equation for a saturated liquid feed to estimate the minimum reflux ratio.