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Asphaltene precipitation is a crucial phase separation phenomenon in the oilindustry, especially in paraffinic froth treatment to extract bitumen from oilsands ores. This work reveals the formation of particles at 0.2 to 0.4 um inradius, defined as a primary sub-micron particle (PSMP), which is ubiquitousfrom diffusive mixing between asphaltene solution and any of 23 types ofprecipitants examined in our experiments. The yield and quantity of asphalteneparticles are affected not only by the Hildebrand solubility parameter of theprecipitants but also by the diffusion coefficients of the asphaltene solutionand the precipitant. The Population Balance Model (PBM) with the Hildebrandsolubility parameter has been used to model particle size distribution. Goodagreement has been achieved between numerical predictions and the experimentaldata. It indicates that the colloid theory can describe the size distributionof PSMP and larger aggregates. Therefore, this study provides new insight intothe mechanism for the dependence of yield and size distribution of theprecipitated asphaltene particles on the composition of precipitants and addinginhibitors. Controlling of asphaltene yield and size distribution may beapplied to the process of hydrocarbon separation or asphaltene precipitationprevention.

Size distribution of primary submicron particles and larger aggregates in solvent induced asphaltene precipitation