Regeneration of Loaded Adsorbent

Disadvantages are the high expense on peripheral conveying equipment and the higher attrition of the adsorbent. 

Continuous adsorption mainly takes place in single or multistage fluidized beds (Figs. 4-4 and 4-20b). Small mesh sieves are used with an adsorbent downcomer or large mesh sieves with the adsorbent raining through the holes (for more information on fluid dynamics see [4.41, 4.42], on residence time [4.43], and on pressure drop, flow through particles, particle concentration 

Whereas adsorption is favored by higher pressure and lower temperature, the opposite process, the desorption is carried out at low pressure and elevated temperature. With desorption, the bond between the adsorbate and adsorbent is broken. Thus the adsorbate is released and the adsorbent regenerated. Depending on the type of adsor-bent/adsorbate system and the adsorption operating eonditions desorption occurs in different ways that may also be combined [4.51, 4.52]  

Active carbon Heat storage Support grid 

Here the temperature of the loaded adsorbent is increased indirectly using a heating surface or by direct contact with hot gas thereby reducing the loading capacity of the adsorbate. The temperature swing process is often applied to molecular sieves where water, hydrogen sulfide, carbon dioxide, etc. are the adsorbates and with active carbon or silica gel, loaded with hydrocarbons. 

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