2.10 Hydrogen sulfide is absorbed by a solution of methanolamine (MEA) in a packed column. At the top of the column, gas is at 20atm and it contains 0.1% of H2S, while the absorbent contains 250mol/m3 of free MEA. The diffusivity of MEA in solution is 0.64 times that of H2S. The reaction is normally regarded as irreversible and instantaneous. (A) (B) For the flow rates and packing used kAla=0.03s1kAga=60mol/m3satmHA=1104m3atm/mol,HenryslawconstantforH2Sinwater. (a) Find the rate of absorption of H2S in MEA solution. (b) To find out whether it is worthwhile using MEA absorbent, determine how much faster is absorption with MEA compared to absorption in pure water. Based on Danckwerts (1970)