Modeling cloud point of soluble polymers in supercritical carbon dioxide fluid using PCP-SAFT equation of state – An application in enhanced oil recovery

Modified quadrupole Cubic Plus Association Equation of State (mqCPA EoS) for thermodynamic modeling of polymer-supercritical CO2 systems

“…(binary interaction parameters). As seen from Table 2 using mqCPA EoS, for the P(AcGlcVE)-scCO 2 systems with the different molar masses AAD% are 2.6, 0.7 and 2.9 while using PCP-SAFT EoS the deviations are 2.4, 0.1 and 0.7, which are given in the previous work [15].…”

“…The superscripts "exp" and "calc" denote the experimental and calculated values, respectively. The details of the calculation and the algorithm are described in the previous study [15]. In this work, we kept the values of the CO 2 parameters unchanged so that using these three equations of state we only carried out the LLE calculations to find out the pure parameters of the present copolymers through regression of the cloud point pressure of the polymer-scCO 2 systems as shown in Tables 2-5.…”

“…In this work, a recent perturbation model of Perturbed Chain Polar -Statistical Associating Fluid Theory (PCP-SAFT EoS) [15,25] is also applied that the dimensionless residual Helmholtz free energy (a ୰ୣୱ ) consists of the three terms as a reference hard-chain contribution [46,47] (a ୦ୡ ), a perturbation contribution [48] (a ୢ୧ୱ୮ ) and a quadrupole-quadrupole contribution [25] (a ).…”

“…FloryHuggins [11][12][13], off-lattice and EoS models like perturbed hard chain theories [14]. On the other hand, only a few thermodynamic equations of state have been applied for calculation of the phase behavior of polymer-scCO 2 systems [15][16][17][18][19][20]. As one can expect, despite the wide use of the equations of state such as cubic and non-cubic relations in design of industrial plants, only a few of them have focused on polymer-scCO 2 systems.…”

“…This modified EoS was successful in correlating the experimental data up to 35MPa. Haghtalab and Soltani Panah [15] applied PCP-SAFT EoS [25] to model the phase behavior of polymer -scCO 2 systems. By taking into account a quadrupole term for quadrupolar interaction between CO 2 molecules and polymer segments, the pure parameters of PCP-SAFT EoS and an extra parameter were correlated so that the very good results were obtained; however, for some systems, the better results were obtained using an interaction parameter, k ij .…”