Determination of Mutual Solubility between CO2 and Water by Using the Peng–Robinson Equation of State with Modified Alpha Function and Binary Interaction Parameter

2013 ◽  
Vol 52 (38) ◽  
pp. 13829-13838 ◽  
Author(s):  
Xiaoli Li ◽  
Daoyong Yang
Keyword(s):  
Equation Of State ◽  
Interaction Parameter ◽  
Mutual Solubility ◽  
Binary Interaction ◽  
Binary Interaction Parameter ◽  
Robinson Equation ◽  
Alpha Function

scholarly journals Application of Peng-Robinson Equation of State for Calculating Solid-Vapor and Solid-Liquid Equilibrium of CH4-CO2 System

2015 ◽  
Vol 9 (7) ◽  
pp. 177 ◽  
Author(s):  
Gede Wibawa ◽  
Muhammad F. A. Nafi ◽  
Asti Permatasari ◽  
Asalil Mustain
Keyword(s):  
Equation Of State ◽  
Binary Interaction ◽  
Binary Interaction Parameter ◽  
Average Absolute Deviation ◽  
Liquid Equilibrium ◽  
Absolute Deviation ◽  
Vapor Equilibrium ◽  
Solid Liquid ◽  
Parameter Values ◽  
Robinson Equation

In this study, the performances of Peng-Robinson Equation of State combined with the classical mixing ruleswere evaluated to calculate solid-vapor equilibrium (SVE) and solid-liquid equilibrium (SLE) of CH4-CO2system. The evaluation was performed by comparing the calculated values with the literature data. In thecalculation of SVE, the new binary interaction parameter values (kij) of CH4-CO2 mixtures were proposed in thiswork based on the experimental data. The proposed kij obtained in this work might increase the accuracy ofPeng-Robinson Equation of State by reducing average absolute deviation in the temperatures between calculatedvalues and literature data from (2.18% to 0.26%), (0.88% to 0.70%) and (0.61% to 0.44%) at CO2 compositionof 1%, 1.91% and 2.93%, respectively. Significant improvement was found at CO2 composition of 1%. In thecalculation of SLE, new parameters were not proposed since the calculation using the existing (literature) kijgives good results with an average absolute deviation of 0.5%.

Analysis of various approaches to accurately prediction of phase equilibrium of binary helium systems based on the Peng-Robinson equation of state

2020 ◽  
pp. 117-126
Author(s):  
V.L. Malyshev ◽  
◽  
E.F. Moiseeva ◽  
Keyword(s):  
Phase Equilibrium ◽  
Equation Of State ◽  
Phase Behavior ◽  
Binary Interaction ◽  
Binary Interaction Parameter ◽  
Multicomponent Systems ◽  
Interaction Coefficients ◽  
Acentric Factor ◽  
Robinson Equation

The paper presents a detailed algorithm for calculating the vapor-liquid phase equilibrium for multicomponent systems based on the Peng-Robinson equation of state. Various approaches are considered that make it possible to improve the quality of predicting phase equilibrium by the example of eight binary helium systems containing nitrogen, argon, carbon dioxide, methane, ethane, propane, isobutane, and n-butane. The influence of the acentric factor and the binary interaction parameter on the accuracy of the helium systems phase behavior predicting is analyzed. The optimal interaction coefficients for the presented systems are found under the assumption that this parameter does not depend on temperature. The temperature range of applicability of various approaches is determined, which makes it possible to maximize the description of the phase behavior of helium systems.

scholarly journals Modelling Sorption Thermodynamics and Mass Transport of n-Hexane in a Propylene-Ethylene Elastomer

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1157
Author(s):  
Daniele Tammaro ◽  
Lorenzo Lombardi ◽  
Giuseppe Scherillo ◽  
Ernesto Di Maio ◽  
Navanshu Ahuja ◽  
...  
Keyword(s):  
Mass Transport ◽  
Interaction Parameter ◽  
Sorption Isotherms ◽  
Binary Interaction ◽  
Binary Interaction Parameter ◽  
Theoretical Interpretation ◽  
Sorption Behavior ◽  
Solvent Mixtures ◽  
Random Lattice ◽  
Hexane Vapor

Optimization of post polymerization processes of polyolefin elastomers (POE) involving solvents is of considerable industrial interest. To this aim, experimental determination and theoretical interpretation of the thermodynamics and mass transport properties of POE-solvent mixtures is relevant. Sorption behavior of n-hexane vapor in a commercial propylene-ethylene elastomer (V8880 VistamaxxTM from ExxonMobil, Machelen, Belgium) is addressed here, determining experimentally the sorption isotherms at temperatures ranging from 115 to 140 °C and pressure values of n-hexane vapor up to 1 atm. Sorption isotherms have been interpreted using a Non Random Lattice Fluid (NRLF) Equation of State model retrieving, from data fitting, the value of the binary interaction parameter for the n-hexane/V8880 system. Both the cases of temperature-independent and of temperature-dependent binary interaction parameter have been considered. Sorption kinetics was also investigated at different pressures and has been interpreted using a Fick’s model determining values of the mutual diffusivity as a function of temperature and of n-hexane/V8880 mixture composition. From these values, n-hexane intra-diffusion coefficient has been calculated interpreting its dependence on mixture concentration and temperature by a semi-empiric model based on free volume arguments.

Sign in / Sign up

Export Citation Format

Share Document