ABSTRACT
Adsorption for gas purification comes under the category of dynamic adsorption. A relationship between adsorbate concentration in the gas stream and solid may be determined experimentally and plotted in the form of isotherms. Dynamic adsorption tests should be conducted with gases related as close as possible to the conditions under which the adsorption plant will operate. Solid-gas phase interaction may occur under two conditions. One involves the random mixing of the phases; the other, their direct relative motion. Adsorption equilibrium is defined when the number of molecules arriving on the surface is equal to the number of molecules leaving the surface into the gas phase. Air pollution problems in which adsorption is considered a unit operation involve gaseous contaminants. Air pollution control is a broad and far-reaching subject that covers many complex unit operations, some consisting of filtration of fluid-solid particles, heat transfer and condensation, absorption in a liquid, state, and adsorption on a solid surface.
