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Separation Process Engineering: Includes Mass Transfer Analysis, Third Edition by Phillip C. Wankat

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18.1.2 Sorbent Types

A variety of sorbents are used commercially for separations. We will first present a very short introduction to commercially used adsorbents. If more detail is required, refer to Yang (2003) who presents very detailed analyses. The commercially important adsorbents are highly porous and have high surface areas per gram. This high surface area greatly increases the capacity for adsorption at the surface. Typically, 98% of the adsorption occurs in the pores inside the particles and only 2% on the external surface. Molecules that adsorb are called the adsorbate. Adsorbed molecules typically have a density close to that of a liquid. Thus, there are major density and volume changes when gases are adsorbed, but very little change ...

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