ISSN:
0001-1541
Keywords:
Chemistry
;
Chemical Engineering
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Process Engineering, Biotechnology, Nutrition Technology
Notes:
The adsorption selectivity, Si, j = (Xi/yi)/(xj/yj), is examined in a 1-D model of a mixture of hard rods adsorbing on a linear substrate. The adsorbed components are characterized by their length, li, and equilibrium constant, ki. We derive an expression for the bulk-phase pressure Po, for which there is no separation of components i and j, S,i, j = 1, in terms of these parameters. The selectivity of the smaller component always increases with the bulk pressure, which results in a selectivity reversal if, as is usually the case, the larger component is more strongly adsorbed at low surface coverages. In a binary mixture, when P 〈 Po, the selectivity of the smaller component decreases with increasing bulk-phase mole fraction, y1, while for P 〉 Po, the reverse is true. The effect of varying the molecular parameters on the selectivity is also studied.
Additional Material:
10 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/aic.690431010
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