Page 92 - Adsorption Technology & Design, Elsevier (1998)
P. 92

Rates of adsorption of gases and vapours by porous media  89







            c
            0
            c
            8
            c
            8


               i  _  .  .  .  .  .  i  -  .
                       Time t                            t
                     Input pulse                      Response

            Figure 4.10  Input pulse and response.


            response  to  be  expected.  A  typical  plot  of  calculated  moments  of  the
            response  as a function  of pellet  dimensions  is shown  in Figure  4.11.





               1.5





               1.0

            IJ/L 2

               0.5





                      ........  I ...........  I  .........  I  ..........
                 0 0.5         1.0      ......  1.5        2.0
                                            VlSL

            Figure 4.11  Moments of response as a function  of pellet dimensions: #/L 2 plotted
                      against V/SL for  the adsorption of butane on silica at 293 K  and the
                      simultaneous  diffusion  of  butane  through  the  compressed  pellet
                      (source: England and Thomas 1976).
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