Page 18 - Gas Adsorption Equilibria
P. 18
Introduction 3
Figure 0.1. The difference between absorption and adsorption.
Symbols: Person: solid material, cake: molecule from gas or liquid phase.
Absorption: The cake is eaten by the person.
Adsorption: The cake is splashed on the persons face.
Consequently, concentrations of gas mixtures and mixture adsorbed
phases – so-called adsorbates or coadsorbates – will be different. This surface
effect of the solid material can be used for several technical processes, the
most important of which are:
1. Gas separation processes [0.7-0.10]
2. Drying processes of gases and solid materials [0.11]
3. Cleaning processes of air, water, soil [0.12, 0.13]
4. Adsorption based energetic processes,
air conditioning refrigerating processes [0.14, 015]
5. Gas storage processes [0.16]
6. Characterization of porous solid materials [0.6].
As there are many presentations of the above mentioned fields in
adsorption science and technology available in literature [0.17-0.19], we here
restrict the discussion to mentions of only a few of the most important
separation processes, cp. Table 0.1. In it the most important adsorption-based
gas separation processes are mentioned and the feed and the products are
designated. Possible sorbent materials are not given here but can be found in
Chap. 1, Tab. 1.3. Also we have chosen not to provide more information on
the processes themselves, for example regeneration procedures of the sorbent
materials used, proposals for flowsheets, typical data of pressures,
temperatures and energy demands, as those can be found in the respective