Adsorption du phénol et du 4-chlorophénol sur les asphaltènes pétroliersAdsorption Isotherms of Phenol and 4-Chlorophenol on Petroleum Asphaltenes | Oil & Gas Science and Technology

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Issue		Oil & Gas Science and Technology - Rev. IFP Energies nouvelles Volume 53, Number 1, January-February 1998 Dossier: Petroleum process themodynamics. 16th european seminar on applied thermodynamics, 19-22 June 1997


Page(s)		35 - 40
DOI		10.2516/ogst:1998006

Oil & Gas Science and Technology - Rev. IFP, Vol. 53 (1998), No. 1, pp. 35-40
DOI: 10.2516/ogst:1998006

Adsorption Isotherms of Phenol and 4-Chlorophenol on Petroleum Asphaltenes

Adsorption du phénol et du 4-chlorophénol sur les asphaltènes pétroliers

M. Jaoui, C. Achard, N. Hasnaoui and M. Rogalski

Université de Metz

Abstract
The adsorption isotherms for phenol and 4-chlorophenol from water onto asphaltenes flocculated in bulk and asphaltenes deposited on silica were established by frontal analysis chromatography at 293, 298, 303, and 308 K. The adsorption was more important with asphaltenes flocculated in bulk and corresponded to a Freundlich isotherm mechanism. The high adsorbed amount of phenols suggests possible migration of phenols through the loose asphaltene structure. Isotherms observed with the silica coated by asphaltenes showed that adsorption occurs in two stages corresponding probably to two different organizations of solute molecules at the surface.

Résumé
Les isothermes d'adsorption du phénol et du 4-chlorophénol en solution dans l'eau sur des asphaltènes floculés en masse et sur des asphaltènes déposés sur de la silice ont été déterminés par analyse chromatographique frontale à 293, 298, 303 et 308 K. L'adsorption sur des asphaltènes floculés en masse était la plus importante avec des isothermes correspondant à un mécanisme de Freundlich. La quantité élevée de phénols adsorbés suggère une migration possible des molécules du phénol à travers la structure peu compacte des asphaltènes. Les isothermes observés dans le cas de silice tapissée d'asphaltènes ont montré que l'adsorption se produit en deux étapes correspondant probablement à deux organisations différentes des molécules de soluté à la surface.

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