For nonspherical particles, dp is defined as the equivalent diameter of a sphere having the same specific surface (external area of the particle/bed volume) as the particle.

When the pressure drop across the adsorbent bed must be small, the shape of both the bed and, consequently, the adsorption wave are different from those for a cylindrical packed adsorber. Figure 5.20.15 shows an example of using a canister-type bed for low pressure drop operations.

Regeneration Operation

For continuous operation, when breakthrough occurs, the adsorbent has reached its operating capacity. The adsorption operation must then be performed in another, unsat-urated bed. The spent adsorbent is regenerated unless it is

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