An absorbing column is used to remove H2S from a flue gas using water as absorbent. The column operates at 20 C. The mo

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An absorbing column is used to remove H2S from a flue gas using
water as absorbent. The column operates at 20 C. The mole fraction
of H2S in the flue gas is 0.0015 and it is desired to remove 95 %
of this in the water. Pure water is used for absorption. The total
gas flow rate is 12 kmol/h and the total liquid flow rate is 2200
kmol/h. The total pressure is 3.0 atm. Total gas and liquid flow
rates may be assumed to be constant.
a) What is the outlet gas and liquid mole fractions of hydrogen
sulfide?
b) How many equilibrium stages are required? (Use
McCabe-Thiele)
c) Find the required number of stages using Kremser
equations.
d) Find the ratio of (L/V) to (L/V)min.