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Separation Process Engineering: Includes Mass Transfer Analysis, Third Edition by Phillip C. Wankat

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12.10 Irreversible Absorption and Co-Current Cascades

Absorption with an irreversible chemical reaction is often used in small facilities for removing obnoxious chemicals. For example, NaOH is used to remove both CO2 and H2S; it reacts with the acid gas in solution and forms a nonvolatile salt. This is convenient in small facilities, because the absorber is usually small and simple and no regeneration facilities are required. However, the cost of the reactant (NaOH) can make operation expensive. In addition, the salt formed has to be disposed of responsibly. In large-scale systems it is usually cheaper and more sustainable to use a solvent that can be regenerated.

Consider a simple absorber where the gas to be treated contains carrier gas C ...

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