Isothermal Titration Calorimetry and Fluorescence Spectroscopy Study Of Asphaltene Self-Association In Toluene And Interaction With A Model Resin

Daniel Merino Garcia, Simon Ivar Andersen

Research output: Contribution to journalConference articleResearchpeer-review

Abstract

This article collects the work performed by Isothermal Titration Caloritnetry (ITC) in the study of the self-association of asphaltenes in toluene solutions. Calorimetric experiments show that asphaltenes, start self-associating at very low concentrations and that the existence of a Critical Micellar Concentration is rather. improbable. The influence of the water dissolved in the-toluene has been studied but the difficulties in keeping the water concentration low hinder the discussion of the results. The calorimetry data have been treated with a simple dimer dissociation model and compared with the results of the titration of three model molecules: nonylphenol, which associates by means of hydrogen bond formation, and coronene and pyrene, which associates by stacking. The results obtained leave open the question about the model-stacking molecules, as it was not possible to elucidate whether they do not associate or the dilution effect does not break the aggregates. The fluorescence spectroscopy results support the results of calorimetry with respect to the self-association at low concentrations. ITC has been applied for the first time to the study of the interaction between asphaltenes and a model resin, namely nonylphenol.
Original languageEnglish
JournalPetroleum Science and Technology
Volume21
Issue number3-4
Pages (from-to)507-525
ISSN1091-6466
DOIs
Publication statusPublished - 2002
Event3rd International Conference on Petroleum Phase behavior and Fouling - New Orleans, United States
Duration: 10 Mar 200214 Mar 2002
Conference number: 3

Conference

Conference3rd International Conference on Petroleum Phase behavior and Fouling
Number3
CountryUnited States
CityNew Orleans
Period10/03/200214/03/2002

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