Page 168 - Adsorption Technology & Design, Elsevier (1998)

156 Design procedures

Table 6.3 Summary of available numerical solutions for breakthrough curves in
isothermal systems with plug flow or axially dispersed flow and Freundlich, Langmuir
or other non-linear isotherms
i ,,, , ,
Rate Expression Equilibrium Flow model Source
model

Fluid film General Plug Chi and Wasan
(1970)
Combined General Plug Acrivos (1956)
resistances
Fluid film Plug Zwiebel et al.
(1972)
Solid film Langmuir Plug Garg and Ruthven
(1973)
External + solid Freundlich Plug Tien and Thodos
films (1959)
Solid diffusion Langmuir Plug Antonson and
Dranoff (1969)
Solid diffusion Langmuir Plug Garg and Ruthven
(1973,1974a)
Solid diffusion Freundlich Plug Kyte (1973)
Pore diffusion Langmuir Plug Carter and Husain
(1972)
Pore diffusion Langmuir Plug axially Garg and Ruthven
external + 4th order dispersed (1974b)
micropore polynomial Lee and Weber
(1969)
External + Freundlich Plug Moon and Lee
micropore (multicomponent) (1986)
External + Empirical Axially dispersed Liapis and Rippin
micropore (binary) (1978)
Micropore Empirical Axially dispersed Balzli et al. (1978)
(multicomponent)

trivial. In such cases it would be possible to assume isothermal operation
since the concentrations of all the adsorbing components would be low. In
contrast, systems comprising high adsorbate concentrations would in-
evitably result in each individual isotherm being affected by the presence of
the other components, as well as by the temperature. Indeed, if the
concentrations and heats of adsorption are significant, then the temperature
rises inside a packed bed may become large and it is then necessary to couple