Concentration swing

Three generic adsorptive process schemes have been commercialized to serve most of the applications shown in Table 1. They include 1) temperature swing adsorption (TSA) 2) pressure swing adsorption (PSA) and 3) concentration swing adsorption (CSA).P The fluid mixture (feed) to be separated is passed over a regenerated adsorbent (contained in an adsorber vessel) to produce a stream enriched in the less strongly adsorbed components of the mixture. 

Concentration swing adsorption (CSA) and concentration-thermal swing adsorption (CTSA) processes for drying bulk liquid mixtures... 

One further development in adsorption technology which holds some promise, is a cyclic process applicable to the separation of liquids. The separation method depends on concentration changes and is referred to as concentration swing adsorption (Rao and Sircar 1992). Separation of a binary mixture, such as ethanol-water, occurs by the selective liquid phase adsorption of ethanol (the more strongly adsorbed component) onto the surface of a porous adsorbent. The cycle consists of four steps ... 

During the first part of the concentration swing adsorption cycle, effluent from the column is pure water. This first step is continued until the whole column is saturated with the ethanol-water feed mixture. 

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