Modelling the phase behavior of alkane mixtures in wide ranges of conditions: New parameterization and predictive correlations of binary interactions for the RKPR EOS

Prediction of the Binary Interaction Parameter of Carbon Dioxide/Alkanes Mixtures in the Pseudocritical Region

“…This is the opposite to the behavior of N 2 / n -alkanes studied by Avlonitis et al 34 In general, k ij is approximately linear with temperature. Additionally, the BIP of alkanes (C 1 –C 10 ) are nonzero, which is inconsistent with the conclusion presented by Duarte et al 28 (Except for CH 4 and C 3 H 8 , the BIPs of alkanes (C 2 –C 24 ) are zero, and that of alkanes (CN ≥ C 24 ) are non-zero).…”

“…It has been accepted that the k ij depends on temperature, and some scholars have described that k ij shows a strong temperature dependence. 18,19,21,27,28 Moreover, Coutinho et al 66 made a theoretical explanation about the temperature dependence of the k ij parameter. In addition, eq 6 is named the group contribution method, which is widely used in engineering calculation and is more accurate for CO 2 /alkanes in the critical region than other approaches.…”

“…In 2015, Duarte et al. 28 projected a new parameterization method for Redlich–Kwong–Peng–Robinson EoS based on the classical vdW mixing rule, which takes into account both attractive and repulsive interaction parameterswhere T c1 is the critical temperature of the component with higher volatility, k ij 0 is a constant.…”

New Correlations for Prediction of High-Pressure Phase Equilibria of n-Alkane Mixtures with the RKPR EoS: Back from the Use of lij (Repulsive) Interaction Parameters

“…In previous studies , the superiority of the generalized Redlich–Kwong–Peng–Robinson Equation of State (RKPR EoS) was demonstrated in comparison to the classic PR EoS in the prediction of the vapor–liquid equilibrium (VLE) of the more asymmetric binary n -alkane– n -alkane mixtures and then also for multicomponent mixtures . The present work was conceived as a continuation of those preceding studies and, at the same time, a turn back from the parameter correlations to which they arrived.…”

“…In particular, those systems presenting a high degree of asymmetry between their components and critical lines extending beyond 1000 bar at temperatures of interest for the oil industry (especially the methane binaries with heavier n -alkanes) cannot be reasonably represented with classic two-parameter Equations of State (EoS) like Soave–Redlich–Kwong (SRK) or Peng–Robinson (PR) with quadratic mixing rules. A review of different attempts to model these series of n -alkane mixtures, considering other types of models and approaches, was part of a preceding work …”