The adsorption kinetics of asphaltenes at the toluenesilica interface has been measured for nine solution concentrations C S (from 5 to 3000 mgL -1 ) Results could be adjusted to an irreversible second-order adsorption kinetics, where the adsorption rate k was strongly dependent on concentration. Thus a large reduction in k was observed when C S was increased in the studied concentration range. This rate reduction was accounted for in terms of adsorption of aggregates formed in solution. The stepwise trends observed for the adsorption isotherms of asphaltenes on mineral surfaces, could be reproduced using the above k values.
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