Abstract

CORTES, Farid B. et al. Adsorption-desorption of n-c ₇ asphaltenes over micro- and nanoparticles of silica and its impact on wettability alteration. C.T.F Cienc. Tecnol. Futuro [online]. 2016, vol.6, n.4, pp.89-106. ISSN 0122-5383.  https://doi.org/10.29047/01225383.06.

In this work, a study of the adsorption/desorption of n-C7 asphaltenes at low and high concentrations (100 - 30000 mg/L) was performed for which the effects of adsorbent particle size (nano and microsilica), pressure, solvent, and temperature were evaluated. Adsorption/desorption tests on different silica surfaces were performed in batch-mode using UV-vis spectrophotometry and thermogravimetric analyses. Owing to its high surface area and dispersibility, nanosilica adsorbed higher quantities of n-C7 asphaltenes than microsilica. Asphaltene desorption from nanosilica surface was significant, while the desorption from microsilica surfaces was insignificant, suggesting a higher adsorption potential for the latter. Asphaltene adsorption increased with pressure and decreased with temperature. Type of solvent plays a significant role on the asphaltene desorption. The wettability tests for virgin nanosilica and nanosilica contained adsorbed asphaltenes showed that even at high asphaltene loading, the nanoparticles maintained its water-wet nature.

Keywords : Adsorption; desorption; asphaltene; reversibility; wettability; silica.

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