By Robert Allen Meyers
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This generally requires a rather large purge volume, so such a process would normally be used only in special circumstances. Displacement desorption is similar to purge gas stripping, except that an adsorbable species is used to displace the adsorbed component from the bed. The displacing component should be adsorbed somewhat less strongly than the preferentially adsorbed species so that the adsorption–desorption equilibrium can be shifted by varying the concentration of the desorbent. Such processes run more or less isothermally and offer a useful alternative to thermal swing processes for strongly adsorbed species when thermal swing would require temperatures high enough to cause cracking, coking, or rapid aging of the adsorbent.
6). It is evident that if an isotherm is favorable for adsorption, and that is the most common situation (corresponding to a type I isotherm of Brunauer’s classification), it will be unfavorable for desorption. The rate at which a disturbance propagates through the column is determined by the slope of the equilibrium isotherm and, for a favorable isotherm, is higher at higher concentrations. This leads to “self-sharpening” of the concentration profile and, in a column of sufficient length, to “constantpattern” behavior (Fig.
For nonpolar systems the major contribution is generally from dispersion–repulsion (van der Waals) forces, which are a fundamental property of all matter. When the surface is polar, depending on the nature of the sorbate molecule, there may also be important contributions from polarization, dipole, and quadrupole interactions. Selective adsorption of a polar species such as water or a quadrupolar species such as CO2 from a mixture with other nonpolar species can therefore be accomplished by using a polar adsorbent.