Asphaltenes are fractions of crude oils that can precipitate and one of the parameters used in the prediction of the conditions in which this phenomenon occurs is the Hildebrand solubility parameter. In this work, it was evaluated the uncertainty propagation in the experimental determination of the solubility parameter of different crude oils, calculated from data of the asphaltenes precipitation by the addition of n-heptane, identified by optical microscopy. It was verified that the solubility parameter of an oil and the associated uncertainty are specific, being recommended that, whenever viable, it is determined parallel both, conferring higher credibility to the results.
asphaltenes; Hildebrand solubility parameter; uncertainty propagation
