Fluid phase equilibria of binary and ternary mixtures of supercritical carbon dioxide with a 1-alkanol and an n-alkane up to 100 MPa and 393 K—cosolvency effect and miscibility windows (Part II)

1996 ◽  
Vol 115 (1-2) ◽  
pp. 165-177 ◽  
Author(s):  
Holger Pöhler ◽  
Arndt L. Scheidgen ◽  
Gerhard M. Schneider
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Phase Equilibria ◽  
Fluid Phase ◽  
Ternary Mixtures ◽  
Binary And Ternary Mixtures ◽  
Fluid Phase Equilibria ◽  
Supercritical Carbon

Fluid Phase Equilibria of Ethanol and Carbon Dioxide Mixtures with Concentration Measurements by Raman Spectroscopy

2002 ◽  
Vol 56 (6) ◽  
pp. 783-788 ◽  
Author(s):  
A. Stratmann ◽  
G. Schweiger
Keyword(s):  
Carbon Dioxide ◽  
Raman Spectroscopy ◽  
High Pressure ◽  
Supercritical Carbon Dioxide ◽  
Phase Equilibria ◽  
Fluid Phase ◽  
Concentration Measurements ◽  
Fluid Phase Equilibria ◽  
Good Agreement ◽  
Supercritical Carbon

Phase equilibria data for the system ethanol/carbon dioxide for T = 313.15 K and pressures up to p = 7.9 MPa are presented. The measurements were made by Raman spectroscopy without the extraction of probes from the autoclave. To the authors knowledge this is the first use of Raman spectroscopy for phase equilibria investigations at high pressure with supercritical carbon dioxide. The data show very good agreement with literature data.

Solid-Fluid Phase Equilibria Measurement for Mixtures of Methane, Carbon-Dioxide and N-Hexadecane

2021 ◽  
Author(s):  
Oluwakemi Victoria Eniolorunda ◽  
Antonin Chapoy ◽  
Rod Burgass
Keyword(s):  
Experimental Data ◽  
Carbon Dioxide ◽  
Equation Of State ◽  
Phase Equilibria ◽  
Activity Coefficients ◽  
Fluid Phase ◽  
Ternary Mixtures ◽  
Binary Interaction ◽  
Thermodynamic Models ◽  
Methane Carbon

Abstract In this study, new experimental data using a reliable approach are reported for solid-fluid phase equilibrium of ternary mixtures of Methane-Carbon-dioxide- n-Hexadecane for 30-73 mol% CO2 and pressures up to 24 MPa. The effect of varying CO2 composition on the overall phase transition of the systems were investigated. Three thermodynamic models were used to predict the liquid phase fugacity, this includes the Peng Robison equation of state (PR-EoS), Soave Redlich-Kwong equation of state (SRK-EoS) and the Cubic plus Association (CPA) equation of state with the classical mixing rule and a group contribution approach for calculating binary interaction parameters in all cases. To describe the wax (solid) phase, three activity coefficient models based on the solid solution theory were investigated: the predictive universal quasichemical activity coefficients (UNIQUAC), Universal quasi-chemical Functional Group activity coefficients (UNIFAC) and the predictive Wilson approach. The solid-fluid equilibria experimental data gathered in this experimental work including those from saturated and under-saturated conditions were used to check the reliability of the various phase equilibria thermodynamic models.

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