Thermodynamic modelling of wax precipitation using PC-SAFT in a multi-solid framework

摘要

In this work, a multi-solid approach is used for wax precipitation modelling with PC-SAFT. A vapour/liquid/solids calculation is performed for determination of wax precipitation weight percent. Beside this, the proposed model is applied to predict the wax appearance temperature (WAT) for the published oil samples experimental precipitation data. The PC-SAFT parameters for petroleum plus fractions are estimated with reliable correlations. Finally, the results of modelling are compared with the results of Lira-Galeana et al. (1996), Pedersen et al. (1991), Dalirsefat and Feyzi (2007) models and a recent work of the authors using a solid solution approach with PC-SAFT plus UNIQUAC activity coefficients according to Bagherinia et al. (2016). The results demonstrate progress in accuracy and propose the model as an acceptable predictive tool. The average absolute deviations percent for WAT estimation over all fluid samples is 0.2, in comparison with 0.55 for the recently published modelling approach (Bagherinia et al., 2016).