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Showing 1 to 20 of 21 for “"Peng-Robinson"”.
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Correlation and prediction of solubility of low vapor pressure solids in supercritical fluids
… in ethane. Two equations of state--the Peng-Robinson equation and the Lee-Kesler equation with Plocker, Knapp and Prausnitz mixing rules--were tested in conjunction with the compressed gas model, permitting a direct comparison of the two equations of state. The sensitivity of the model …
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Vapor-liquid Equilibrium of Polymer Solutions During Thermal Decomposition of Rigid Foams
… used alone, as well as in combinations with the Peng-Robinson equation of state (EOS) through the Wong-Sandler mixing rules. Because several of the models required values for polymer volumes, a comparison of the GCVOL and GCMCM group-contribution volume estimation methods was performed. GCMCM was …
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Supercritical Fluids: Kinetic Solvent Effect and the Correlation of Solid-Fluid Equilibria
… in terms of transition state theory using the Peng-Robinson equation. The slowing of the dimerization and the implications of this result for the general case of a reactive system in a supercritical solvent are discussed in terms of the relative sizes and energies of the reactive solutes and …
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Numerical simulations of supercritical water-hydrocarbon mixing in a 3-D cylindrical tee mixer
… property variations of real fluid mixtures. A Peng-Robinson EoS with simple van der Waals mixing rules is employed to model the near-critical thermodynamic behavior, with the mixture binary interaction parameter obtained from a Predictive Peng-Robinson approach using a group contribution method …
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Reverse Microemulsion System In Compressed Co2: Phase Behavior and Applications For Cleaning Biomaterials
… M at 278.15 K and 15.2 MPa. In addition, the Peng-Robinson equation of state (PREOS) with the van der Waals mixing rules were used to model the Ls-54/CO2 and water/CO2 binary systems. The PREOS model showed reasonable agreements with the experimental data for both Ls-54/CO2 and water/CO2 …
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Batch separation of tetrafluoroethylene, hexafluoropropylene and octafluorocyclobutane
… distillation column. The data were fitted to the Peng-Robinson equation of state, utilizing the Mathias-Copeman alpha function. The model was used with the Wong- Sandler mixing rules alongside the NRTL alpha function. The model was fitted with mean relative deviations lower than 1.2 %, indicating …
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Measurement and Modeling of Pentane-Diluted Bitumen Phase Behaviour
… were generated from the data. The Advanced Peng Robinson (APR) CEoS with several sets of asymmetric and compositionally dependent mixing rules was evaluated using the aforementioned dataset. The use of asymmetric mixing rules significantly improved the match to asphaltene yield data; …
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Simulation and optimisation of the separation process in offshore oil and gas platforms.
… However, solution of such calculation using the Peng-Robinson equation of state is a complex problem due to the iterative nature of the algorithm and various uncertainties. Our analysis shows that the sources of these uncertainties are poor estimation of initial K-factors, incorrect and/or slow …
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Thermodynamic and Experimental Studies of Ionic Liquids for Carbon Dioxide Capture
… included equations of state, such as the Peng-Robinson (PR-EoS), Sove-Redlich-Kwong (SRK) with quadratic mixing rules, and Non-Random Two-Liquid (NRTL) activity coefficient model. Binary interaction parameters were obtained for the correlations. All models produced low values for their …
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Development of a generalised kinetic model for the combustion of hydrocarbon fuels
… The binary interaction rules are based on the Peng-Robinson mixing rules. Overall the ignition delays of binary fuel blends were accurately predicted using binary interactions. However, when modelling the blends between methanol and n-heptane, where one fuel has extreme NTC behaviour and the …
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Modeling of droplet evaporation, flash-boiling, and mixture preparation in internal combustion engines
… solver based on the fugacity coefficient of the Peng-Robinson equation of state. The modular droplet evaporation model is integrated into a customized engine CFD software, KIVA, to simulate the droplet evaporation in fuel spray. Flash-boiling of spray generates ultra-fine fuel mist and is …
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Simulation of two-phase dynamics using lattice boltzmann method (LBM)
… addition, a simulation methodology based on the Peng-Robinson (P-R) equation of state has been devised in the LB framework. The developed P-R model can accurately predict phase-coexistence curve for water and steam at different system temperatures and allows simulation of phases with varying …
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Phase Behaviour of Alkane Solvent(s)-CO2- Water-Heavy Oil Systems at High Pressures and Elevated Temperatures
… temperatures. A new alpha function in the Peng–Robinson equation of state (PR EOS) has been developed for water component to improve its prediction for water vapour pressure in a wide temperature range. Subsequently, a new temperature-dependent binary interaction parameter (BIP) correlation …
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Nonequilibrium phase Behaviour and Mass Transfer of Alkane Solvents(s)-CO2-Heavy Oil Systems Under Reservoir Conditions
… induced by the heated and diluted heavy oil. The Peng-Robinson equation of state, heat transfer equation, and diffusion-convection equation are coupled to describe both mass and heat transfer for the aforementioned systems. The individual diffusion coefficient between each component of a gas …
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Performance Evaluation of an Enhanced Cyclic Solvent Process (ECSP) for Thin Heavy Oil Reservoirs
… are also found to have high values. The tuned Peng-Robinson equation of state (PR EOS) (1978) model can be used to reproduce the saturation pressures and swelling factors with an average relative error of 3.68% and 3.76%, respectively, while the modified viscosity model is able to predict the …
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Viscosity modeling of solvent-water-heavy oil/bitumen systems at high pressures and elevated temperatures
… and temperature conditions by integrating the Peng-Robinson equation of state (PR EOS) with binary interaction parameters (BIPs) and modified alpha functions. By treating heavy oil/bitumen as either as a single pseudocomponent (PC) or multiple PCs, the six most common mixing rules (i.e., …
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Quantification of Phase Behaviour and Physical Properties of Solvents-Heavy Oil/Bitumen-Water Systems at High Pressures and Elevated Temperatures
… reduced temperature for acentric factor for the Peng-Robinson equation of state (PR-EOS) and Soave-Redlich- Kwong equation of state (SRK-EOS) by minimizing the deviation between the measured and calculated vapour pressures. The reduced temperature has its optimum value of 0.59 for the two EOSs, …
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Phase Behaviour and Mass Transfer of Solvent(s)-CO2-Heavy Oil Systems Under Reservoir Conditions
… oil systems, a new alpha function for the Peng-Robinson equation of state (PR EOS) is first developed. In comparison with the existing alpha functions evaluated in this study, the modified alpha function with the redefined acentric factor at a reduced temperature of 0.6 provides more …
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An Experimental Study of Carbon Dioxide Dissolution into a Light Crude Oil
… as the predicted HCs extraction by using the Peng‒Robinson equation of state (P‒R EOS). Finally, the pressure history matching (PHM) method was also employed to determine the CO2 effective diffusivity in a short period of each diffusion test, in comparison with the graphical method. The …
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Development and demonstration of a new non-equilibrium rate-based process model for the hot potassium carbonate process.
… hot potassium carbonate system and the standard Peng-Robinson property package model in HYSYS® was modified to include tabular physical property models to accommodate the hot potassium carbonate system. Relevant model parameters were determined from literature data. As for the Aspen Custom …
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