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

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18.2.3 Application of Linear Solute Movement Theory to Purge Cycles and Elution Chromatography

The simplest regeneration cycle is a purge cycle using an inert carrier gas for gas systems or an inert solvent for liquid systems. This cycle can be operated co-flow (Figure 18-5A) or counterflow (Figure 18-5B). When the purge gas or liquid enters the column, the partial pressure or concentration of the adsorbate will drop since it is being diluted. This causes adsorbate to desorb (see Figure 18-2), thus, allowing it to be flushed from the column. The ideal carrier gas or solvent has the following properties: easy to separate from the adsorbate, easy to remove from the bed, nontoxic, nonflammable, available, and inexpensive. For purge gas systems nitrogen ...

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