Abstract
In the theory of petroleum disperse systems, the concept of the complex structural unit (CSU) establishes the layer-by-layer differentiation of components around the core. Molecules with the highest pair interaction potential (PIP) form the core of the CSU and molecules with lower PIP form the interfacial layer. To support the proposed CSU model, experimental data were analyzed on the heats of mixing of compounds of different classes (paraffins, naphthenes, aromatics) present in crude oils, and the mixing heats were correlated with intermolecular interaction energies. The change in the mixing heat values from an exothermic effect to an endothermic effect corresponded to a change to weaker intermolecular interactions. Two series of hydrocarbons with decreasing interaction strength were established.
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