Consider a simple batch still initially charged with 100 kmol of crude starting material with a composition of 50 mol% benzene in toluene. Given that this system has a constant relative volatility (a) of 2.41 at these conditions, if the still pot concentration goes down to 15 mol% benzene when the run is completed. a. find W final
b. Drotal
c. XD, avg

Apreheater involves the use of condensing steam at 100°c on the inside of a bank of tubes to heat air that enters at 1 atm and 25°c. the air moves at 5 m/s in cross flow over the tubes. each tube is 1 m long and has an outside diameter of 10 mm. what is the minimum value of nl needed to achieve an outlet temperature of t 75 c? what is the corresponding pressure drop across the tube bank?