Solvent regeneration after desulfurization and decarbonization
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The existing rich liquid (MDEA) that has absorbed CO2 and H2S requires solvent regeneration; I would appreciate guidance from experts on an appropriate process flow. It would be best to remove CO2 first, followed by H2S, with the hydrogen sulfide-containing gas being sent to a sulfur recovery unit.
The rich liquid first enters the rich liquid flash tank (which also serves as a buffer for the raw material), where the light hydrocarbons in the rich liquid are flashed off. It then goes to the solvent regeneration tower, where hydrogen sulfide and methyl diethanolamine are separated. The hydrogen sulfide gas at the top of the tower is sent for sulfur production, while the lean liquid at the bottom is recycled.
That’s the next step; is it the same process when there is both hydrogen sulfide and carbon dioxide? The acidic gas going to the desulfurization recovery unit should not contain too much carbon dioxide
Then we can separate the acidic gas later