= We are absorbing hydrogen sulfide at 15C into water. The entering water is pure. The feed gas contains 0.0012 mole fraction hydrogen sulfide and we want to remove 97% of this in the water. The total gas flow rate is 10 kmoles/hr. The total liquid flow rate is 2000 kmoles/hr. Total pressure is 2.5 atm. You can assume that total liquid and gas flow rates are constant and a counter - current absorption tower. Equilibrium data is: Partial pressure of hydrogen sulfide (atm) = 423 x ; where x is the mole fraction of hydrogen sulfide in the water. (a) Calculate the outlet gas and liquid mole fracs of hydrogen sulfide. (b) Calculate the number of equilibrium stages required using a McCabe-Thiele diagram. (c) If L/G M * (L/G)min, find the multiplier M (M > 1). (d) Can the absorption tower operate in a cocurrent mode, i.e., liquid and gas flowing in the co current direction? Think and write down one or two advantages that one mode of operation offers over the other. *