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Papers by Alain Valtz

Research paper thumbnail of Experimental Measurement of Vapor Pressures and Densities at Saturation of Pure Hexafluoropropylene Oxide: Modeling Using a Crossover Equation of State

Industrial & Engineering Chemistry Research, Mar 9, 2011

Hydrofluoroalkenes, like hexafluoropropylene, can be considered as new fluids for refrigeration s... more Hydrofluoroalkenes, like hexafluoropropylene, can be considered as new fluids for refrigeration systems, and consequently volumetric and critical property data are required. In this study a vibrating-tube densitometer technique was used to determine densities at 10 different temperatures between (263 and 362) K and pressures between (0.0009 and 10) MPa. The experimental uncertainties are (0.0005 MPa for pressure, (0.02 K for the temperature, and (0.05 % for vapor and liquid densities. Critical properties have been determined by direct measurement and utilization of experimental densities considering scaling laws. The Wagner, Span and Wagner, Peng-Robinson, and translated Peng-Robinson equations of state are used to correlate the data.

Research paper thumbnail of Experimental measurements and modelling of vapour−liquid equilibria for four mixtures of 2,3,3,3−tetrafluoropropene (R1234yf) with 1,1,1,2−tetrafluoroethane (R134a) or 1,1−difluoroethane (R152a) or trans−1−chloro−3,3,3−trifluoropropene (R1233zd(E)) or 2−chloro−3,3,3−trifluoropropene (R1233xf)

Experimental measurements and modelling of vapour−liquid equilibria for four mixtures of 2,3,3,3−tetrafluoropropene (R1234yf) with 1,1,1,2−tetrafluoroethane (R134a) or 1,1−difluoroethane (R152a) or trans−1−chloro−3,3,3−trifluoropropene (R1233zd(E)) or 2−chloro−3,3,3−trifluoropropene (R1233xf)

International Journal of Refrigeration

Research paper thumbnail of Isothermal P, x, y data for the nitrogen + carbon monoxide system at five temperatures from 100 to 130 K and pressures up to 3.4 MPa

Research paper thumbnail of Density and Viscosity Measurements and Modeling of CO2-Loaded and Unloaded Aqueous Solutions of Potassium Lysinate

Journal of Chemical & Engineering Data, 2021

Research paper thumbnail of Experimental Measurements and Modeling of Vapor-Liquid Equilibrium of Isobutane and Ethyl Mercaptan Binary System

International Journal of Petroleum Technology, 2021

In this work, new isothermal experimental data of vapor-liquid equilibrium of the isobutane and e... more In this work, new isothermal experimental data of vapor-liquid equilibrium of the isobutane and ethyl mercaptan binary system are presented. The pressure and temperature conditions are up to 1 MPa and between 298 and 343K. The experimental apparatus is based on a “static-analytic method” specially developed for low-pressure measurements. Two online capillary samplers are used to take vapor and liquid samples that are analyzed with a gas chromatograph. The classical Peng Robinson Equation of State is used to correlate the experimental data. The van Ness test is used to check the consistency of the data. The measured data are also compared to predicted values from two predictive models, and a good agreement is found between the PSRK UNIFAC and the PPR78 models and the experimental measurements.

Research paper thumbnail of Experimental Density Data of Three Carbon Dioxide and Oxygen Binary Mixtures at Temperatures from 276 to 416 K and at Pressures up to 20 MPa

Journal of Chemical & Engineering Data, 2020

U min ()= 0.2 kg.m-3 U max ()= 8 kg.m-3 U min ()= 0.5 kg.m-3 U max ()= 15 kg.m-3 U min ()= 0... more U min ()= 0.2 kg.m-3 U max ()= 8 kg.m-3 U min ()= 0.5 kg.m-3 U max ()= 15 kg.m-3 U min ()= 0.4 kg.m-3 U max ()= 13 kg.m-3 U min ()= 0.1 kg.m-3 U max ()= 3 kg.m-3 U min ()= 0.1 kg.m-3 U max ()= 3 kg.m-3 U min ()= 0.1 kg.m-3 U max ()= 2 kg.m-3 U min ()= 0.2 kg.m-3 U max ()= 5 kg.m-3 U min ()= 0.1kg.m-3 U max ()= 2.5 kg.m-3 p/MPa /kg.m-3 p/MPa /kg.m-3 p/MPa /kg.m-3 p/MPa /kg.m-3  p/MPa /kg.m-3  p/MPa /kg.m-3  p/MPa /kg.m-3  p/MPa /kg.m-3 

Research paper thumbnail of Vapor Liquid Equilibrium Data for the Hydrogen Chloride–Chlorobenzene Binary System at 353.16, 403.16, and 453.25 K

Journal of Chemical & Engineering Data, 2020

The study presents p-T-x-y phase equilibria measurements of one solvent, chlorobenzene and one so... more The study presents p-T-x-y phase equilibria measurements of one solvent, chlorobenzene and one solute, hydrogen chloride. The technique of the equipment used is based on a "static-analytic" method that takes advantages of two capillary samplers linked to a gas chromatograph. Measurements were done at three temperatures (353.16, 403.16 and 453.25 K) and pressures from 0.6 up to 6.5 MPa. The experimental data measured were successfully correlated using the Peng Robinson Equation of state.

Research paper thumbnail of Vapour-liquid equilibria of n-butane and ethyl mercaptan: Experiments and modelling

Fluid Phase Equilibria, 2019

Research paper thumbnail of Phase Equilibrium of Three Binary Mixtures Containing NO and Components Present in Ambient Air

Journal of Chemical & Engineering Data, 2018

Research paper thumbnail of Experimental measurements and modelling of vapour-liquid equilibrium of 2,3,3,3-tetrafluoropropene (R-1234yf) + 1,1,1,2,2-pentafluoropropane (R-245cb) system

International Journal of Refrigeration, 2019

Research paper thumbnail of Vapour-Liquid Equilibria of Ethane and Ethanethiol: Experiments and Modelling

Journal of Natural Gas Engineering, 2019

Research paper thumbnail of Equilibrium data and GC-PC SAFT predictions for furanic extraction

Fluid Phase Equilibria, 2016

Research paper thumbnail of Experimental and modelling study of the densities of the hydrogen sulphide + methane mixtures at 253, 273 and 293 K and pressures up to 30 MPa

Fluid Phase Equilibria, 2016

Research paper thumbnail of Densities and derived thermophysical properties of the 0.9505 CO2+ 0.0495 H2S mixture from 273 K to 353 K and pressures up to 41 MPa

Fluid Phase Equilibria, 2016

Research paper thumbnail of Phase equilibrium data for the hydrogen sulphide + methane system at temperatures from 186 to 313 K and pressures up to about 14 MPa

Fluid Phase Equilibria, 2014

Research paper thumbnail of Thermodynamic behavior of the CO2+SO2 mixture: Experimental and Monte Carlo simulation studies

Research paper thumbnail of Thermodynamic study of binary and ternary systems containing CO2+impurities in the context of CO2 transportation

Fluid Phase Equilibria, 2014

Research paper thumbnail of Vapor−Liquid Equilibrium Data for the Azeotropic Difluoromethane + Propane System at Temperatures from 294.83 to 343.26 K and Pressures up to 5.4 MPa

Journal of Chemical & Engineering Data, 2003

Isothermal vapor-liquid equilibrium data for the Difluoromethane (R32) + Propane binary system ar... more Isothermal vapor-liquid equilibrium data for the Difluoromethane (R32) + Propane binary system are presented at 278.10, 294.83, 303.23, 313.26 and 343.26 K and pressures up to 5.4 MPa. The experimental method is the static-analytic type. It takes advantage of mobile pneumatic capillary samplers (Rolsi™, Armines' patent) developed in our laboratory. At a fixed temperature the azeotrope vapor pressure is larger then those of the pure component. The particularity of R32-Propane azeotropic binary system is to present in two critical point over the critical temperature if the azeotrope. This particular behavior has been proved and even shown visually by means of two supplementary experiments with equipment based on the static-synthetic method involving a variable volume cell. Data along the five isotherms have been represented with the Soave-Redlich-Kwong (SRK) equation of state and MHV1 mixing rules involving the NRTL model. We have calculated the location of the azeotrope using the equality of Equation of State attractive parameter between the two phases.

Research paper thumbnail of Experimental Measurement of Vapor Pressures and Densities at Saturation of Pure Hexafluoropropylene Oxide: Modeling Using a Crossover Equation of State

Industrial & Engineering Chemistry Research, 2011

... Modeling In a previous paper,(3) we used the Peng−Robinson equation of state (PR EoS)(13) wit... more ... Modeling In a previous paper,(3) we used the Peng−Robinson equation of state (PR EoS)(13) with the Mathias−Copeman (MC)(14) alpha function to correlate the vapor pressure and the densities of HFP. ... That is why, in this work, it is specified “Landau-crossover”. ...

Research paper thumbnail of Reply to “Comments on ‘Experimental Measurement of Vapor Pressures and Densities at Saturation of Pure Hexafluoropropylene Oxide: Modeling Using a Crossover Equation of State’”

Industrial & Engineering Chemistry Research, 2011

En référence à 1) Comments on "Experimental Measurement of Vapor Pressures and Densities at ... more En référence à 1) Comments on "Experimental Measurement of Vapor Pressures and Densities at Saturation of Pure Hexafluoropropylene Oxide: Modeling Using a Crossover Equation of State" Author(s): Laugier, Serge; Richon, Dominique Source: INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH Volume: 50 Issue: 15 Special Issue: SI Pages: 9473-9475 DOI: 10.1021/ie2011559 Published: AUG 3 2011 2) Experimental Measurement of Vapor Pressures and Densities at Saturation of Pure Hexafluoropropylene Oxide: Modeling Using a Crossover Equation of State Author(s): Dicko, Moussa; Belaribi-Boukais, Ghemina; Coquelet, Christophe; Valtz, Alain; Belaribi, Farid Brahim; Naidoo, Paramespri; Ramjugernath, Deresh Source: INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH Volume: 50 Issue: 8 Pages: 4761-4768 DOI: 10.1021/ie102354p Published: APR 20 2011International audienc

Research paper thumbnail of Experimental Measurement of Vapor Pressures and Densities at Saturation of Pure Hexafluoropropylene Oxide: Modeling Using a Crossover Equation of State

Industrial & Engineering Chemistry Research, Mar 9, 2011

Hydrofluoroalkenes, like hexafluoropropylene, can be considered as new fluids for refrigeration s... more Hydrofluoroalkenes, like hexafluoropropylene, can be considered as new fluids for refrigeration systems, and consequently volumetric and critical property data are required. In this study a vibrating-tube densitometer technique was used to determine densities at 10 different temperatures between (263 and 362) K and pressures between (0.0009 and 10) MPa. The experimental uncertainties are (0.0005 MPa for pressure, (0.02 K for the temperature, and (0.05 % for vapor and liquid densities. Critical properties have been determined by direct measurement and utilization of experimental densities considering scaling laws. The Wagner, Span and Wagner, Peng-Robinson, and translated Peng-Robinson equations of state are used to correlate the data.

Research paper thumbnail of Experimental measurements and modelling of vapour−liquid equilibria for four mixtures of 2,3,3,3−tetrafluoropropene (R1234yf) with 1,1,1,2−tetrafluoroethane (R134a) or 1,1−difluoroethane (R152a) or trans−1−chloro−3,3,3−trifluoropropene (R1233zd(E)) or 2−chloro−3,3,3−trifluoropropene (R1233xf)

Experimental measurements and modelling of vapour−liquid equilibria for four mixtures of 2,3,3,3−tetrafluoropropene (R1234yf) with 1,1,1,2−tetrafluoroethane (R134a) or 1,1−difluoroethane (R152a) or trans−1−chloro−3,3,3−trifluoropropene (R1233zd(E)) or 2−chloro−3,3,3−trifluoropropene (R1233xf)

International Journal of Refrigeration

Research paper thumbnail of Isothermal P, x, y data for the nitrogen + carbon monoxide system at five temperatures from 100 to 130 K and pressures up to 3.4 MPa

Research paper thumbnail of Density and Viscosity Measurements and Modeling of CO2-Loaded and Unloaded Aqueous Solutions of Potassium Lysinate

Journal of Chemical & Engineering Data, 2021

Research paper thumbnail of Experimental Measurements and Modeling of Vapor-Liquid Equilibrium of Isobutane and Ethyl Mercaptan Binary System

International Journal of Petroleum Technology, 2021

In this work, new isothermal experimental data of vapor-liquid equilibrium of the isobutane and e... more In this work, new isothermal experimental data of vapor-liquid equilibrium of the isobutane and ethyl mercaptan binary system are presented. The pressure and temperature conditions are up to 1 MPa and between 298 and 343K. The experimental apparatus is based on a “static-analytic method” specially developed for low-pressure measurements. Two online capillary samplers are used to take vapor and liquid samples that are analyzed with a gas chromatograph. The classical Peng Robinson Equation of State is used to correlate the experimental data. The van Ness test is used to check the consistency of the data. The measured data are also compared to predicted values from two predictive models, and a good agreement is found between the PSRK UNIFAC and the PPR78 models and the experimental measurements.

Research paper thumbnail of Experimental Density Data of Three Carbon Dioxide and Oxygen Binary Mixtures at Temperatures from 276 to 416 K and at Pressures up to 20 MPa

Journal of Chemical & Engineering Data, 2020

U min ()= 0.2 kg.m-3 U max ()= 8 kg.m-3 U min ()= 0.5 kg.m-3 U max ()= 15 kg.m-3 U min ()= 0... more U min ()= 0.2 kg.m-3 U max ()= 8 kg.m-3 U min ()= 0.5 kg.m-3 U max ()= 15 kg.m-3 U min ()= 0.4 kg.m-3 U max ()= 13 kg.m-3 U min ()= 0.1 kg.m-3 U max ()= 3 kg.m-3 U min ()= 0.1 kg.m-3 U max ()= 3 kg.m-3 U min ()= 0.1 kg.m-3 U max ()= 2 kg.m-3 U min ()= 0.2 kg.m-3 U max ()= 5 kg.m-3 U min ()= 0.1kg.m-3 U max ()= 2.5 kg.m-3 p/MPa /kg.m-3 p/MPa /kg.m-3 p/MPa /kg.m-3 p/MPa /kg.m-3  p/MPa /kg.m-3  p/MPa /kg.m-3  p/MPa /kg.m-3  p/MPa /kg.m-3 

Research paper thumbnail of Vapor Liquid Equilibrium Data for the Hydrogen Chloride–Chlorobenzene Binary System at 353.16, 403.16, and 453.25 K

Journal of Chemical & Engineering Data, 2020

The study presents p-T-x-y phase equilibria measurements of one solvent, chlorobenzene and one so... more The study presents p-T-x-y phase equilibria measurements of one solvent, chlorobenzene and one solute, hydrogen chloride. The technique of the equipment used is based on a "static-analytic" method that takes advantages of two capillary samplers linked to a gas chromatograph. Measurements were done at three temperatures (353.16, 403.16 and 453.25 K) and pressures from 0.6 up to 6.5 MPa. The experimental data measured were successfully correlated using the Peng Robinson Equation of state.

Research paper thumbnail of Vapour-liquid equilibria of n-butane and ethyl mercaptan: Experiments and modelling

Fluid Phase Equilibria, 2019

Research paper thumbnail of Phase Equilibrium of Three Binary Mixtures Containing NO and Components Present in Ambient Air

Journal of Chemical & Engineering Data, 2018

Research paper thumbnail of Experimental measurements and modelling of vapour-liquid equilibrium of 2,3,3,3-tetrafluoropropene (R-1234yf) + 1,1,1,2,2-pentafluoropropane (R-245cb) system

International Journal of Refrigeration, 2019

Research paper thumbnail of Vapour-Liquid Equilibria of Ethane and Ethanethiol: Experiments and Modelling

Journal of Natural Gas Engineering, 2019

Research paper thumbnail of Equilibrium data and GC-PC SAFT predictions for furanic extraction

Fluid Phase Equilibria, 2016

Research paper thumbnail of Experimental and modelling study of the densities of the hydrogen sulphide + methane mixtures at 253, 273 and 293 K and pressures up to 30 MPa

Fluid Phase Equilibria, 2016

Research paper thumbnail of Densities and derived thermophysical properties of the 0.9505 CO2+ 0.0495 H2S mixture from 273 K to 353 K and pressures up to 41 MPa

Fluid Phase Equilibria, 2016

Research paper thumbnail of Phase equilibrium data for the hydrogen sulphide + methane system at temperatures from 186 to 313 K and pressures up to about 14 MPa

Fluid Phase Equilibria, 2014

Research paper thumbnail of Thermodynamic behavior of the CO2+SO2 mixture: Experimental and Monte Carlo simulation studies

Research paper thumbnail of Thermodynamic study of binary and ternary systems containing CO2+impurities in the context of CO2 transportation

Fluid Phase Equilibria, 2014

Research paper thumbnail of Vapor−Liquid Equilibrium Data for the Azeotropic Difluoromethane + Propane System at Temperatures from 294.83 to 343.26 K and Pressures up to 5.4 MPa

Journal of Chemical & Engineering Data, 2003

Isothermal vapor-liquid equilibrium data for the Difluoromethane (R32) + Propane binary system ar... more Isothermal vapor-liquid equilibrium data for the Difluoromethane (R32) + Propane binary system are presented at 278.10, 294.83, 303.23, 313.26 and 343.26 K and pressures up to 5.4 MPa. The experimental method is the static-analytic type. It takes advantage of mobile pneumatic capillary samplers (Rolsi™, Armines' patent) developed in our laboratory. At a fixed temperature the azeotrope vapor pressure is larger then those of the pure component. The particularity of R32-Propane azeotropic binary system is to present in two critical point over the critical temperature if the azeotrope. This particular behavior has been proved and even shown visually by means of two supplementary experiments with equipment based on the static-synthetic method involving a variable volume cell. Data along the five isotherms have been represented with the Soave-Redlich-Kwong (SRK) equation of state and MHV1 mixing rules involving the NRTL model. We have calculated the location of the azeotrope using the equality of Equation of State attractive parameter between the two phases.

Research paper thumbnail of Experimental Measurement of Vapor Pressures and Densities at Saturation of Pure Hexafluoropropylene Oxide: Modeling Using a Crossover Equation of State

Industrial & Engineering Chemistry Research, 2011

... Modeling In a previous paper,(3) we used the Peng−Robinson equation of state (PR EoS)(13) wit... more ... Modeling In a previous paper,(3) we used the Peng−Robinson equation of state (PR EoS)(13) with the Mathias−Copeman (MC)(14) alpha function to correlate the vapor pressure and the densities of HFP. ... That is why, in this work, it is specified “Landau-crossover”. ...

Research paper thumbnail of Reply to “Comments on ‘Experimental Measurement of Vapor Pressures and Densities at Saturation of Pure Hexafluoropropylene Oxide: Modeling Using a Crossover Equation of State’”

Industrial & Engineering Chemistry Research, 2011

En référence à 1) Comments on "Experimental Measurement of Vapor Pressures and Densities at ... more En référence à 1) Comments on "Experimental Measurement of Vapor Pressures and Densities at Saturation of Pure Hexafluoropropylene Oxide: Modeling Using a Crossover Equation of State" Author(s): Laugier, Serge; Richon, Dominique Source: INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH Volume: 50 Issue: 15 Special Issue: SI Pages: 9473-9475 DOI: 10.1021/ie2011559 Published: AUG 3 2011 2) Experimental Measurement of Vapor Pressures and Densities at Saturation of Pure Hexafluoropropylene Oxide: Modeling Using a Crossover Equation of State Author(s): Dicko, Moussa; Belaribi-Boukais, Ghemina; Coquelet, Christophe; Valtz, Alain; Belaribi, Farid Brahim; Naidoo, Paramespri; Ramjugernath, Deresh Source: INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH Volume: 50 Issue: 8 Pages: 4761-4768 DOI: 10.1021/ie102354p Published: APR 20 2011International audienc