Resins: The Molecules Responsible for the Stability/Instability Phenomena of Asphaltenes

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• 作者：Juan C. Pereira ; Isbet L&oacute ; pez ; Reinardo Salas ; Freddy Silva ; Celeste Fern&aacute ; ndez ; Caribay Urbina ; Juan C. L&oacute ; pez
• 刊名：Energy & Fuels
• 出版年：2007
• 出版时间：May 2007
• 年：2007
• 卷：21
• 期：3
• 页码：1317 - 1321
• 全文大小：139K
• 年卷期：v.21,no.3(May 2007)
• ISSN：1520-5029

文摘

Resins are reported to be able to contribute to both the stabilization and destabilization of asphaltenes.Resin adsorption isotherms were carried out on different substrates such as silica particles or asphaltenes andsilica-asphaltene fraction A₂ complexes extracted from different Venezuelan crude oils, which either showevidence of precipitation problems (Furrial) or do not (Hamaca and Guafita). Experimental evidence indicatesthat resins from Furrial crude oil display a much higher tendency to adsorb on the different substrates thanresins from the two other crude oils, even on silica particles with the same surface area for all of the resins,thus indicating a higher self-interaction. This self-interaction of resin molecules is shown to be the key factorin determining whether these molecules do or do not stabilize asphaltene colloidal particles against aggregation.The experimental results are interpreted according to a simple repulsion/adhesion alternative model.