Hydrogen sulfide is absorbed by a solution of methanolamine (MEA) in a packed column At the top of the column, gas is at 20 atm and it contains 0 1 of H 2 S, while the absorbent contains 250 mol m 3 of free MEA The diffusivity of MEA in solution is 0 64 times that of H 2 S The reaction is normally ...

To find the rate of absorption of H2S in the MEA solution and compare it to absorption in pure water ...

Hydrogen sulfide is absorbed by a solution of methanolamine (MEA) in a packed column. At the top

Question:

Hydrogen sulfide is absorbed by a solution of methanolamine (MEA) in a packed column. At the top of the column, gas is at 20 atm and it contains 0.1% of H₂S, while the absorbent contains 250 mol/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. HS + RNH HS + RNH; (A) (B)

For the flow rates and packing used KA = 0.03 S-1 kaga = 60 mol/m.s.atm HA = 1 10-4 m.atm/mol, Henry's law constant for HS in water.

(a) Find the rate of absorption of H,S 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. This problem was adapted from Danckwerts (1970).

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