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The acid gas removal unit simulated for this case is shown in Figure 2.6. This unit is similar to the dehydration unit (Section 2.5.1.1). The solvents (methyl diethanolamine [MDEA] and piperazine) are used to remove acid gases, CO₂ and H₂S, from the incoming sour gas in the absorber column, and the solvents are stripped of the impurities in the stripper.

Figure 2.6 Acid gas removal unit.