De Vault equation

The physical concepts to be retained are dispersive waves are formed when isotherms are unfavorable each concentration propagates with a velocity given by the De Vault equation. Compressive waves are formed for favorable isotherms and the physical limit is a shock which propagates with a velocity... 

This equation has an exactly similar form to equation (7.1.9) (the de Vault equation). Therefore, following a procedure similar to that used to obtain equations (7.1.12a) and (7.1.12e), we can obtain tbe following expression for tbe concentration wave velocity, i , of species i (Fisb et al., 1989) ... 

We make three assumptions now we have isothermal, nondispersive and equilibrium operation (these are exactly the same assumptions used to develop the De Vault equation (7.1.8) for fixed-bed adsorption processes). The assumption of equilibrium everywhere between phases 7=1 and 7" = 2 suggests... 

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