Heater

FIG. 16-55 Adsorbent wheels for gas separation (a) horizontal with fixed beds (b) vertical monolith. (Reprinted with permission of UOP.) FIG. 16-56 Annular bed for liquid separation. Reprinted with permission ofMarcel Dekker. Reference Canon, Begovich, and Sisson, Sep. Sci. Technol., 15, 655-678 (1980). FIG. 16-56 Annular bed for liquid separation. Reprinted with permission ofMarcel Dekker. Reference Canon, Begovich, and Sisson, Sep. Sci. Technol., 15, 655-678 (1980). placed downward by opening...

Classification

Chromatography is a sorptive separation process where a portion of a solute mixture (feed) is introduced at the inlet of a column containing a selective adsorbent (stationary phase) and separated over the length of the column by the action of a carrier fluid (mobile phase) that is continually supplied to the column following introduction of the feed. The mobile phase is generally free of the feed components, but may contain various other species introduced to modulate the chromato-graphic...

Other Adsorption Cycles

Steam When steam is used for regeneration of activated carbon, it is desorbing by a combination thermal swing and displacement purge (described earlier in this section). The exothermic heat released when the steam is adsorbed supplies the thermal energy much more efficiently than is possible with heated gas purging. Slightly superheated steam at about 130 C is introduced into the bed countercur-rent to adsorption for adsorbates with high boiling points, the steam temperature must be higher....

Temperature Swing Adsorption

A temperature-swing, or thermal-swing, adsorption (TSA) process cycle is one in which desorption takes place at a temperature much higher than adsorption. The elevation of temperature is used to shift the adsorption equilibrium and affect regeneration of the adsorbent. Figure 16-38 depicts a simplified (and ideal) TSA cycle. The feed fluid containing an adsorbate at a partial pressure of pi is passed through an adsorbent at temperature 7 . This adsorption step continues until the equilibrium...

Multiple Components Or Exchanges

When more than one adsorbed species or more than two ion-exchanged species interact in some manner, equilibrium becomes more complicated. Usually, thermodynamics provides a sound basis for prediction. Adsorbed-Solution Theory The common thermodynamic approach to multicomponent adsorption treats adsorption equilibrium in a way analogous to fluid-fluid equilibrium. The theory has as its basis the Gibbs adsorption isotherm Young and Crowell, gen. refs. , which is where is chemical potential. For...