Application of PHSC equation of state in prediction of gas hydrate formation condition

Measurement and Modeling of the Densities for CO2 + Dodecane System from 313.55 K to 353.55 K and Pressures up to 18 MPa

“…9 Valavi et al predicted the densities of CO 2 − ethane and CO 2 −methane mixtures by PHSC and obtained AADs of 4.46% and 4.34%, respectively. 10 Sharafi et al used PHSC to predict the densities of the R32−R134a mixture and obtained an AAD of 1.08%. 11 The precision of PHSC models for the CO 2 −alkane systems is not sufficiently high.…”

“…Li et al used the Perturbed Hard-Sphere Chain (PHSC) model to predict the densities of CO 2 –heptane mixtures and obtained an AAD of 1.25% . Valavi et al predicted the densities of CO 2 –ethane and CO 2 –methane mixtures by PHSC and obtained AADs of 4.46% and 4.34%, respectively . Sharafi et al used PHSC to predict the densities of the R32–R134a mixture and obtained an AAD of 1.08% .…”

Extension of the electrolyte Trebble–Bishnoi EOS to mixed‐salt systems, and application to vapour liquid and solid (hydrate) vapour liquid equilibrium calculations

“…It should be noted that not all electrolyte equations of state contain all of these terms. Ion-ion electrostatic interaction terms are most commonly represented by either the mean spherical approximation [14,16,[18][19][20][21]32,[34][35][36][37][38] (MSA) or by the Debye-Hückel theory, [17,20,23,[29][30][31] whereas equations of state that include an ion charging term, [14][15][16][19][20][21]27,28,30,32] most often represent it as a Born energy term. [14,15,20,22,24,[30][31][32] Ion-water interactions, on the other hand, have been described by an association term, [14,21,22,[28][29][30][31][32][33] a Margules term, [17,20] or an ion solvation term.…”

“…To date, electrolyte equations of state have been assessed for a variety of phase equilibrium calculations. In single electrolyte systems, it has been shown that water vapour pressures, [28][29][30]37,38] gas solubilities, [14,16,17,20,25,27,30,32,38] salt solubilities, [18,24,31] and gas hydrate equilibrium conditions [16,19,21,23,24,26,33,36,39,40] can be accurately predicted, using a single equation of state for all fluid phases. In contrast, phase equilibrium data for mixed electrolyte systems are relatively scarce, and thus, relatively few attempts have been made at the modelling phase behaviour in aqueous mixed-salt systems.…”

Application of Extended UNIQUAC Activity Coefficient Model for Predicting the Clathrate Hydrate Stability Conditions

“…Jiang et al studied the hydrate dissociation conditions of methane, ethane, and propane in the presence of different alcohols and salts by applying the ion-based SAFT2 coupled with van der Waals and Platteeuw theory. Valavi and Dehghani developed a model on the basis of the modified PHSC EoS. Zare et al investigated the effects of five ionic liquids on methane hydrate systems by applying the cubic square well EoS along with the theory of van der Waals–Platteeuw.…”