Chapter 15 Studies of Asphaltene Diffusion: Implications for Asphaltene Structure and Optimal Upgrading Reactor Design

Sane, R.C.; Tsotsis, Theodore T.; Webster, Ian A.; Ravikumar, V.

doi:10.1016/s0376-7361(09)70262-6

Cited by 3 publications

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“…Asphaltenes are a solubility class of compounds found in the original crude characterized by a high heteroatom content and a macromolecular colloidal nature. The choice of asphaltenes as a model system has attracted considerable debate (Bunger and Cogswell, 1981;McKay et al, 1978;Koots and Speight, 1975;Wiehe, 1992;Sane et al, 1994), related to the issue of whether asphaltenes bear simi-…”

Section: Introductionmentioning

confidence: 99%

Studies of Transport of Asphaltenes through Membranes Using Hindered Diffusion Theories for Spheres and Spheroids

Ravikumar

Tsotsis

Sahimi

1997

Ind. Eng. Chem. Res.

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The results of ongoing efforts by this group to model the transport of asphaltene molecules through model membranes are presented. A model is described which aims to capture the effect of the polydisperse nature of asphaltene molecules on their transport properties. The asphaltene structure is generated stochastically using Monte Carlo techniques. Individual asphaltene molecules are approximated as spheroids for the purpose of calculating their hindered diffusivities. Continuum hydrodynamic theories and boundary element methods are used to calculate the diffusion coefficients. A number of analytical expressions, scaling relationships, and approximations utilized in the literature are evaluated.

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