Wax formation from paraffinic mixtures: A simplified thermodynamic model based on sensitivity analysis together with a new modified predictive UNIQUAC

► New predictive approach for SL fugacity ratio in the wax thermodynamic model. ► New heat capacity models for n-alkanes related to the SL fugacity ratio approach. ► Exhaustive sensitivity analysis on the new approach results a simplified model. ► New modified P-UNIQUAC describing non-ideality of solid wax phase. ► A reliable wax thermodynamic model based on the simplified approach and new P-UNIQUAC.