Wax content measurements in partially frozen paraffinic systems

Waxy solid content and wax composition were measured as a function of temperature below the onset crystallization temperatures in several synthetic systems made up of a solvent (decane) and a paraffinic heavy fraction. The heavy fraction of the first system studied was made up of a regular series of heavy alkanes ranging from C18 to C36. Whereas in other systems, some intermediate paraffins were removed from the series in order to have various «bimodal» distributions. Experimental data were used to test the capacity of a local composition model to predict solid phase behaviors of these bimodal paraffinic distributions.