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A general review [1, 2] is presented concerning joi ntly the crystallographic structures and the transition physicochemical data (Tfus, fusH, fusS, ebH, subH, Cp) in the pure normal alkanes, as well as the structural and thermodynamic behavior of their synthetic binary, t ernary and multinary model mixtures and of real petroleum waxes, particularly the solubility and mixture prop erties [3-6]. A major part of the structural and thermodyn amic data of the literature and our experimental results are listed from methane up to the alkane with carbon at om number equal to 390 [1, 2] as well as their variati ons versus the atom carbon number. The experimental results [3] and those of literatur e concerning the pure n-alkane dissolution enthalpies allow to determine the enthalpy of the formation of one o r several crystallized solid solutions of the mixture s [4] and to highlight the influence of the characteristic pa rameters of the paraffinic distribution (theoretical average chain length, n-alkanes number, monophasic or polyphasic state) on the excess properties in the solid state. This data bank permits to test the predictive capacities of t he UNIQUAC thermodynamic model. After modifying the expression of the interaction energy to take into a ccount the effect of the size difference between the n-alk anes of the mixtures and the internal disorder induced by t he nalkane length distribution, this model give very go od results for the prediction of the excess enthalpy o f complex multialkane samples [4].

Thermodynamic and structural studies of the solid deposit formation in paraffinic petroleum cuts