Crossover kinetics of asphaltene aggregation in hydrocarbon solutions

I.k Yudin, G.l Nikolaenko, E.e Gorodetskii, E.l Markhashov, V.a Agayan, M.a Anisimov and J.v Sengers

Physica A: Statistical Mechanics and its Applications, 1998, vol. 251, issue 1, 235-244

Abstract: We have investigated the kinetics of asphaltene aggregation in toluene+n-heptane mixtures with a dynamic light-scattering method adapted to opaque fluids. Two types of aggregation kinetics have been observed: diffusion-limited aggregation and reaction-limited aggregation. At asphaltene concentrations in toluene below the critical micelle concentration of about 3gl−1 the aggregation kinetics appears to be solely limited by diffusion. Far above the critical micelle concentration reaction-limited aggregation takes place at least in the initial stage of particle growth. At a concentration of asphaltenes in toluene slightly above the critical micelle concentration, a crossover between these two types of aggregation kinetics has been observed. We propose a simple theoretical expression for the crossover kinetics and also a universal scaled description of the observed phenomena.

Keywords: Aggregation kinetics; Asphaltenes; Dynamic light scattering (search for similar items in EconPapers)
Date: 1998
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:251:y:1998:i:1:p:235-244

DOI: 10.1016/S0378-4371(97)00607-9

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