Study of asphaltene precipitation by Calorimetry

Sylvain Charles Roland Verdier, Frédéric Plantier, David Bessières, Simon Ivar Andersen, Erling Halfdan Stenby, Hervé Carrier

Research output: Contribution to journalJournal articleResearchpeer-review


Can calorimetry bring new input to the Current understanding of asphaltene precipitation? In this work, two types of precipitation were studied by means of calorimetry: addition of n-heptane into asphaltene solutions and temperature/pressure variations on a recombined live oil. The first series of experiments showed that weak forces determine precipitation. Indeed, isothermal titration calorimetry could not detect any clear signal although this technique can detect low-energy transitions such as liquid-liquid equilibrium and rnicellization. The second series of tests proved that precipitation caused by T and P variations is exothermic for this system. Furthermore, the temperature-induced precipitation is accompanied by an increase in the apparent thermal expansivity. Therefore, it seems that these two phase transitions exhibit different calorimetric behaviours and they may not be as similar as expected.
Original languageEnglish
JournalEnergy & Fuels
Issue number6
Pages (from-to)3583-3587
Publication statusPublished - 2007


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