Adsorption from liquid mixtures

Fig. XI-11. Relation of adsorption from binary liquid mixtures to the separate vapor pressure adsorption isotherms, system ethanol-benzene-charcoal (n) separate mixed-vapor isotherms (b) calculated and observed adsorption from liquid mixtures. (From Ref. 143.)...

F. Riedo and E. Kovats, Adsorption from liquid mixtures and hquid chromatography, /. Chromatogr. 239 (1982), 1-28. 

Adsorption from liquid mixtures with H bonding between components. 

Figure 7 shows an example of type IV isotherms for adsorption of trace water from toluene and p-xylene mixtures on Alcoa H-152 alumina at 22° C [22], The abcissa of the plot represents relative saturation of water (xi/x ), where x is the molar fraction of water at the solubility limit in the hydrocarbon liquid. Equilibrium isotherm models analogous to those used for pure water vapour adsorption can be derived for describing trace water adsorption from liquid mixtures [20-22],... 

Adsorption from liquid mixtures on solids underlies a number of extremely important processes and plays a significant role in many fields of the natural sciences. Studies of this phenomenon were reported in several monographies and reviews e.g. [1-3]. The formulation of a unified theory of adsorption from solutions is difficult because there are liquid mixtures with extremely different physicochemical properties. Usually, existing theoretical descriptions are limited to the following cases ... 

Ash et al. (1973) extended the preceding theory to the adsorption from liquid mixtures. It follows very similar lines to the gas/solid situation and so, in the interests of concision, it will not be reproduced here. For a binary mixture of solute 2 in solvent 1, the analogue of the gas/solid equation (17.17) is... 

PodkoScielny, P, Djbrowski, A. and Leboda, R. (2001). Fractal approach of adsorption from liquid mixtures on silica gel. Colloids Surf., 182, 219-229. 

Contemporary theory on the multi-site occupancy adsorption on heterogeneous solid surfaces is rather scanty. The reason is that such description involves a new degree of complexity and only a few papers have been published on this subject [260,261]. Rudzihski and co-workers [262-265] accepted the Everett s equation for the multisite occupancy adsorption from liquid mixtures [266] on solid surfaces as a starting expression for description of adsorption on heterogeneous surfaces with random and patchwise topography. The short review on the subject is presented in reference [267]. 

Adsorption from Liquid Mixtures on Solid Surfaces... 

Problem 7.15 Composite adsorption isotherms The following adsorption isotherm curves are individual (true) adsorption isotherms for the adsorption from liquid mixtures of benzene and ethanol on dispersed carbon powders. 

---