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
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