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- Dr. Catinca Secuianu is habilitated professor at the Department of Inorganic Chemistry, Physical Chemistry and Electr... moreDr. Catinca Secuianu is habilitated professor at the Department of Inorganic Chemistry, Physical Chemistry and Electrochemistry, Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, in Bucharest, Romania, the largest technical university in the country. She is the head of the Laboratory of Applied Thermodynamics and Thermophysical Properties (LATTP).(Dr. Catinca Secuianu is habilitated professor at the Department of Inorganic Chemistry, Physical Chemistry and Electrochemistry, Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, in Bucharest, Romania, the largest technical university in the country. She is the head of the Laboratory of Applied Thermodynamics and Thermophysical Properties (LATTP).)edit
... early works, the method has been widely used for the measurement of diffusion coefficients in a wide range of fluids and conditions,(7-11) especially organic mixtures,(12, 13) and in supercritical fluids.(14-20) Tominaga et al.,(21)... more
... early works, the method has been widely used for the measurement of diffusion coefficients in a wide range of fluids and conditions,(7-11) especially organic mixtures,(12, 13) and in supercritical fluids.(14-20) Tominaga et al.,(21) Leaist,(22) and Castillo and Garza(23) showed ...
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... early works, the method has been widely used for the measurement of diffusion coefficients in a wide range of fluids and conditions,(7-11) especially organic mixtures,(12, 13) and in supercritical fluids.(14-20) Tominaga et al.,(21)... more
... early works, the method has been widely used for the measurement of diffusion coefficients in a wide range of fluids and conditions,(7-11) especially organic mixtures,(12, 13) and in supercritical fluids.(14-20) Tominaga et al.,(21) Leaist,(22) and Castillo and Garza(23) showed ...
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ABSTRACT New refractive indices at 25 °C were measured and are reported here for 19 binary mixtures of pentan-3-one+1,2-dichloroethane, +1,3-dichloropropane, +1,4-dichlorobutane, +trichloromethane, +1,1,1-trichloroethane,... more
ABSTRACT New refractive indices at 25 °C were measured and are reported here for 19 binary mixtures of pentan-3-one+1,2-dichloroethane, +1,3-dichloropropane, +1,4-dichlorobutane, +trichloromethane, +1,1,1-trichloroethane, +1,1,2,2-tetrachloroethane; cyclopentanone+1-chlorobutane, +1,1,2,2-tetrachloroethane; cyclohexanone+1,1,2,2-tetrachloroethane; 5-chloro-2-pentanone+n-hexane, +toluene, +ethylbenzene; nitromethane+trichloromethane; and nitromethane or nitroethane, +1,2-dichloroethane, +1,3-dichloropropane, +1,4-dichlorobutane. The experimental refractive index deviations from linear mixing behavior have been evaluated and correlated consistently with the 3-parameter Redlich–Kister equation with good results. The molar refraction was also examined for the systems including pentan-3-one, cyclopentanone, cyclohexanone and 5-chloro-2-pentanone for which densities and excess molar volumes are available from previous works. Different theoretical (n, ρ) mixing rules were tested for these systems. The excess Gibbs energy G E and excess enthalpy H E values were considered together with the excess molar volumes V E, excess refractive indexes $ n_{\text{D}}^{\text{E}} $ , molar refraction R and excess molar refractions R E on mixing in the discussion of the influence of the alkyl chain length or of the nature of the second component in the mixture in terms of molecular interactions.
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In recent years, the dramatic increase of greenhouse gases concentration in atmosphere, especially of carbon dioxide, determined many researchers to investigate new mitigation options. Thermodynamic studies play an important role in the... more
In recent years, the dramatic increase of greenhouse gases concentration in atmosphere, especially of carbon dioxide, determined many researchers to investigate new mitigation options. Thermodynamic studies play an important role in the development of new technologies for reducing the carbon levels. In this context, our group investigated the phase behavior (vapor–liquid equilibrium (VLE), vapor–liquid–liquid equilibrium (VLLE), liquid–liquid equilibrium (LLE), upper critical endpoints (UCEPs), critical curves) of binary and ternary systems containing organic substances with different functional groups to determine their ability to dissolve carbon dioxide. This study presents our results for the phase behavior of carbon dioxide + n-butanol structural isomers binary systems at high-pressures. Liquid–vapor critical curves are measured for carbon dioxide + isobutanol and carbon dioxide + tert-butanol binary systems at pressures up to 147.3 bar, as only few scattered critical points are...
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Densities and refractive indices of the 1-hexanol + n-pentadecane binary system have been measured at T = (293.15, 298.15, 303.15, 313.15, and 323.15 K) and atmospheric pressure, over the whole composition range. Different theoretical... more
Densities and refractive indices of the 1-hexanol + n-pentadecane binary system have been measured at T = (293.15, 298.15, 303.15, 313.15, and 323.15 K) and atmospheric pressure, over the whole composition range. Different theoretical (n-ρ) mixing rules were tested for the system studied. The excess molar volumes (VE), the molar refraction (R), and the corresponding deviations of the 1-hexanol + n-pentadecane system have been calculated. The deviations of the respective excess properties have been also evaluated and correlated with the consistent 3-parameters Redlich-Kister equation with good results.
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Density and refractive index have been experimentally determined for binary liquid mixtures of n-octane + 2-hexanol, n-octane + 2-octanol, and 2-hexanol + 2-octanol at 298.15 K and atmospheric pressure, over the whole composition range. A... more
Density and refractive index have been experimentally determined for binary liquid mixtures of n-octane + 2-hexanol, n-octane + 2-octanol, and 2-hexanol + 2-octanol at 298.15 K and atmospheric pressure, over the whole composition range. A comparative study of several relations for predicting the refractive index of a liquid has been carried out to test their validity for the above systems. The excess molar properties are calculated from the measured data and are correlated by a Redlich-Kister type equation.
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ABSTRACT
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A new reduction method for mixture phase stability testing is proposed, consisting in Newton iterations with a particular set of independent variables and residual functions. The dimension of the problem does not depend on the number of... more
A new reduction method for mixture phase stability testing is proposed, consisting in Newton iterations with a particular set of independent variables and residual functions. The dimension of the problem does not depend on the number of components but on the number of components with nonzero binary interaction parameters in the equation of state. Numerical experiments show an improved convergence behavior, mainly for the domain located outside the stability test limit locus in the pressure–temperature plane, recommending the proposed method for any applications in which the problematic domain is crossed a very large number of times during simulations.
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SUNITA ANDREEA MOGA1*, NICOLAE GOGA2,3, SVETLANA BAOUKINA4, CATINCA SECUIANU5,6, ANTON HADAR1,7 1Politehnica University of Bucharest, Department of Materials Strength, 313 Spl. Independenþei, 060042 Bucharest, Romania 2 Politehnica... more
SUNITA ANDREEA MOGA1*, NICOLAE GOGA2,3, SVETLANA BAOUKINA4, CATINCA SECUIANU5,6, ANTON HADAR1,7 1Politehnica University of Bucharest, Department of Materials Strength, 313 Spl. Independenþei, 060042 Bucharest, Romania 2 Politehnica University of Bucharest, Department of Engineering in Foreign Languages, 313 Spl. Independenþei, 060042 Bucharest, Romania 3University of Groningen, Groningen,the Netherlands, Molecular Dynamics Group 4 University of Calgary, Department of Biological Sciences,Calgary, Canada 5 Politehnica University of Bucharest, Department of Inorganic Chemistry, Physical Chemistry & Electrochemistry, 1-7 Gh. Polizu Str., 011061 Bucharest, Romania 6Department of Chemical Engineering, Imperial College London, South Kensington Campus, SW7 2AZ London, United Kingdom 7Academy of Romanian Scientists, 54 Splaiul Independentei, 50085, Bucharest, Romania
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The ability of different thermodynamic models to predict the phase behavior of carbon dioxide (1) + 2-propanol (2) binary system is tested. The models chosen are Soave-Redlich-Kwong (SRK) and Peng-Robinson (PR) cubic equations of state... more
The ability of different thermodynamic models to predict the phase behavior of carbon dioxide (1) + 2-propanol (2) binary system is tested. The models chosen are Soave-Redlich-Kwong (SRK) and Peng-Robinson (PR) cubic equations of state (EOS), coupled with classical van der Waals mixing rules (two-parameter conventional mixing rule, 2PCMR) mixing rules. A single set of binary parameters was used to predict the global phase behavior of the system for a wide range of pressure and temperature. Although the models used are simple, they are able to represent reasonably well the complex phase behavior of the system studied in this work.
In recent years we have focused our efforts on investigating various binary mixtures containing carbon dioxide to find the best candidate for CO2 capture and, therefore, for applications in the field of CCS and CCUS technologies.... more
In recent years we have focused our efforts on investigating various binary mixtures containing carbon dioxide to find the best candidate for CO2 capture and, therefore, for applications in the field of CCS and CCUS technologies. Continuing this project, the present study investigates the phase behavior of three binary systems containing carbon dioxide and different oxygenated compounds. Two thermodynamic models are examined for their ability to predict the phase behavior of these systems. The selected models are the well-known Peng–Robinson (PR) equation of state and the General Equation of State (GEOS), which is a generalization for all cubic equations of state with two, three, and four parameters, coupled with classical van der Waals mixing rules (two-parameter conventional mixing rule, 2PCMR). The carbon dioxide + ethyl acetate, carbon dioxide + 1,4-dioxane, and carbon dioxide + 1,2-dimethoxyethane binary systems were analyzed based on GEOS and PR equation of state models. The m...
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Carbon dioxide (CO2) is an important material in many industries but is also representing more than 80% of greenhouse gases (GHGs). Anthropogenic carbon dioxide accumulates in the atmosphere through burning fossil fuels (coal, oil, and... more
Carbon dioxide (CO2) is an important material in many industries but is also representing more than 80% of greenhouse gases (GHGs). Anthropogenic carbon dioxide accumulates in the atmosphere through burning fossil fuels (coal, oil, and natural gas) in power plants and energy production facilities, and solid waste, trees, and other biological materials. It is also the result of certain chemical reactions in different industry (e.g., cement and steel industries). Carbon capture and storage (CCS), among other options, is an essential technology for the cost-effective mitigation of anthropogenic CO2 emissions and could contribute approximately 20% to CO2 emission reductions by 2050, as recommended by International Energy Agency (IEA). Although CCS has enormous potential in numerous industries and petroleum refineries due their large CO2 emissions, a significant impediment to its utilization on a large scale remains both operating and capital costs. It is possible to reduce the costs of ...
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The purpose of this paper is to demonstrate the ability of a cubic equation model to predict the phase behavior of the carbon dioxide (1) + isopropanol (2) binary system. The model selected is the cubic General Equation of State – GEOS,... more
The purpose of this paper is to demonstrate the ability of a cubic equation model to predict the phase behavior of the carbon dioxide (1) + isopropanol (2) binary system. The model selected is the cubic General Equation of State – GEOS, coupled with classical van der Waals mixing rules – two-parameter conventional mixing rule, 2PCMR. One unique set of binary interaction parameters is used to predict the phase behavior of the system.
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Phase equilibria for carbon dioxide + methanol binary system were calculated using the Soave-Redlich- Kwong (SRK) equation of state coupled with Huron-Vidal at infinite dilution (HVID) mixing rules. The series carbon dioxide + methanol... more
Phase equilibria for carbon dioxide + methanol binary system were calculated using the Soave-Redlich- Kwong (SRK) equation of state coupled with Huron-Vidal at infinite dilution (HVID) mixing rules. The series carbon dioxide + methanol binary system exhibits type I, according to the classification of van Konynenburg and Scott (1980). A linear correlation of the HVID parameters with the inverse of the temperature is proposed by using experimental data measured at temperatures near critical point of carbon dioxide. The values of HVID parameters from the linear correlation were used to predict vapor-liquid equilibria (VLE) and the critical curve. The topology of the phase behavior of the carbon dioxide + methanol system is satisfactory predicted with the SRK/HVID model. Interest in supercritical fluids is increasing throughout numerous scientific and technological fields. A more efficient use of supercritical fluids as media for separations, reactions and material productions requires quantitative prediction of phase equilibria, thermodynamic, and transport properties of supercritical fluid mixtures. Previous works (1-2) have suggested that it is a very difficult and challenging task for equations of state to simultaneously predict the equilibria properties without preliminary use of experimental data, and to yield accurate results in both the sub-critical and critical regions. The authors have recently undertaken a series of experimental studies of the phase equilibria of binary mixtures composed of carbon dioxide and alcohols (3- 10). A semi-predictive method (SPM) for calculating phase equilibria based on minimum experimental data is presented. The Soave-Redlich-Kwong (SRK) equation of state coupled with the Huron-Vidal infinite dilution (HVID) mixing rules (11-12) was used to predict the complex phase behavior of carbon dioxide and alcohols series. In this study we show the results obtained for the carbon dioxide + methanol binary system, which is type I fluid phase behavior, according to the classification of van Konynenburg and Scott (13). The carbon dioxide + methanol system, besides its practical importance, is useful for the present study because offers a severe test for thermodynamic models due to complex chemical nature of methanol mixtures. Results and discussion The phase equilibria data measured (6, 14-15) at temperatures near critical point of carbon dioxide were correlated by the Soave-Redlich-Kwong (SRK) equation of state coupled with the Huron-Vidal infinite dilution (HVID) mixing rules. The correlations by the SRK/HVID model are compared with the experimental data in figure 1. The optimum values of the HVID residual UNIQUAC parameters (11) (u 12 and u 21 ) were plotted against the inverse of the temperature in Figure 2. As can be seen, the data are fitted with a linear correlation. The linear equations
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ABSTRACT
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Pentru fluidele de răcire R22 (Clorodifluorometan), R124 (2-cloro-1,1,1,2-tetrafluoroetan) şi R142b (1-cloro-1,1-difluoroetan) au fost efectuate calcule de predicţie a proprietăţilor termodinamice, inclusiv proprietăţile PVT (presiune –... more
Pentru fluidele de răcire R22 (Clorodifluorometan), R124 (2-cloro-1,1,1,2-tetrafluoroetan) şi R142b (1-cloro-1,1-difluoroetan) au fost efectuate calcule de predicţie a proprietăţilor termodinamice, inclusiv proprietăţile PVT (presiune – volum – temperatură), pe curba de saturaţie, între punctul triplu şi punctul critic. Au fost utilizate trei ecuaţii cubice de stare: Soave-Redlich-Kwong (SRK), Peng-Robinson (PR) şi GEOS3C. A fost efectuată o comparaţie cu date experimentale. Ecuaţia de stare GEOS3C a condus la cele mai bune rezultate, forma sa generală, dar în acelaşi timp simplă, recomandând-o pentru aplicaţii. Thermodynamic properties, including pressure – volume – temperature (PVT), were predicted along the saturation curve for refrigerants R22 (Chlorodifluoromethane), R124 (2-chloro-1,1,1,2-tetrafloroethane) and R142b (1-chloro-1,1-difluoroethane). Three cubic equations of state (EOS) were used: Soave-Redlich-Kwong (SRK), Peng-Robinson (PR) and GEOS3C. A wide comparison with exp...
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Isothermal vapor-liquid equilibria measurements for binary and ternary mixtures containing carbon dioxide, 1-heptanol, and pentadecane at the temperatures of 298.15 and 316.15 K are reported. Phase equilibria measurements were made in a... more
Isothermal vapor-liquid equilibria measurements for binary and ternary mixtures containing carbon dioxide, 1-heptanol, and pentadecane at the temperatures of 298.15 and 316.15 K are reported. Phase equilibria measurements were made in a high-pressure visual cell with variable volume based on the static-analytical method. Both binary systems exhibit type III phase behavior, according to the classification of van Konynenburg and Scott. The phase equilibrium in the binary systems was correlated with the Soave-Redlich-Kwong (SRK) equation of state coupled with the Huron-Vidal infinite dilution (HVID) mixing rules. The parameters for the binary mixtures are further used to predict the phase equilibria of the ternary system n-pentadecane + 1-heptanol + carbon dioxide. Validation of the predictions was achieved by comparison with experimental results. The model has the capability to predict the cosolvency effect.
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Research Interests: Engineering, Chemistry, High Pressure, Carbon Dioxide, Supercritical fluids, and 11 moreEnvironmental Sciences, Phase equilibria, Van Der Waals, CHEMICAL SCIENCES, Supercritical carbon dioxide, Analytical Method, Liquid-Liquid Equilibria of Toluene, Vapor Liquid Equilibria, Phase Behavior, Equation of State, and Phase Equilibrium
... Figure 3. P−T fluid phase diagram of the carbon dioxide (1) + 2-butanol (2) system: , Stevens et al.;(13) Δ, Silva-Oliver et al.;(15) ●, critical points of pure components;(22, 23) ▲, experimental UCEP, Stevens et al.;(13) , vapor... more
... Figure 3. P−T fluid phase diagram of the carbon dioxide (1) + 2-butanol (2) system: , Stevens et al.;(13) Δ, Silva-Oliver et al.;(15) ●, critical points of pure components;(22, 23) ▲, experimental UCEP, Stevens et al.;(13) , vapor pressure curves of pure components; bold −, critical ...
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ABSTRACT Vapor–liquid (VLE) and vapor–liquid–liquid equilibria (VLLE) data for the carbon dioxide + pentan-1-ol (n-pentanol) system at (293.15, 303.15, 316.65, and 333.15) K up to 10.67 MPa are reported. The experimental method used in... more
ABSTRACT Vapor–liquid (VLE) and vapor–liquid–liquid equilibria (VLLE) data for the carbon dioxide + pentan-1-ol (n-pentanol) system at (293.15, 303.15, 316.65, and 333.15) K up to 10.67 MPa are reported. The experimental method used in this work was a static–analytical method with liquid and vapor phase sampling. The new experimental results are discussed and compared with available literature data. Measured data and literature data for the carbon dioxide + n-pentanol system were modeled with the Soave–Redlich–Kwong (SRK) and Peng–Robinson (PR) equation of state (EoS) using classical van der Waals (two-parameter conventional mixing rule, 2PCMR) mixing rules. A single set of interaction parameters was used to predict the complex phase behavior of the binary mixture carbon dioxide + n-pentanol. Both models predict correctly the phase behavior and a good account of the majority of the data available in the literature.
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Research Interests: Chemical Engineering, Chemistry, Inorganic Chemistry, VLE, High Pressure, and 12 moreCarbon Dioxide, Equations of State, Classical Physics, Alcohol, Phase equilibria, Analytical Method, Fluid phase equilibria, Vapor Liquid Equilibria, Phase Behavior, Equation of State, Phase Equilibrium, and UNIQUAC
Vapor-liquid equilibria (VLE) data for the carbon dioxide + methanol system was measured at 293.15, 298.15, 310.15, and 323.15 K. Phase behavior measurements were made in a high-pressure visual cell with variable volume, based on the... more
Vapor-liquid equilibria (VLE) data for the carbon dioxide + methanol system was measured at 293.15, 298.15, 310.15, and 323.15 K. Phase behavior measurements were made in a high-pressure visual cell with variable volume, based on the static-analytic method. The pressure range under investigation was between 4.8 and 95.1 bar. The Soave-Redlich-Kwong (SRK)-EOS coupled with Huron-Vidal (HV) mixing rules and a reduced UNIQUAC model, was used in a semi-predictive approach, in order to represent the phase behavior (critical curve, isothermal VLE) of the system. The topology of the phase behavior of the carbon dioxide + methanol system is satisfactory predicted with the SRK/HV-residual UNIQUAC model.
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The phase behavior of the carbon dioxide + cycloalkane mixtures usually receives low attention, though these systems are important for many industries, e.g. the carbon capture and storage. In this paper calculations results for the carbon... more
The phase behavior of the carbon dioxide + cycloalkane mixtures usually receives low attention, though these systems are important for many industries, e.g. the carbon capture and storage. In this paper calculations results for the carbon dioxide + cyclopentane binary system are presented, based on SRK and PR cubic equations of state with classical van der Waals mixing rules. A single set of binary parameters for each model was proposed to predict the global phase behavior of the system in a wide range of pressure and temperature. Albeit the thermodynamic models used are simple, they are able to represent fairly well the phase behavior of the system analyzed in this paper.
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New vapor-liquid equilibria (VLE) data at 323.15, 333.15, 343.15, and 353.15 K and pressures up to 112.9 bar are reported for the carbon dioxide + 2-methyl-2-propanol system. The experimental method used in this work was a static... more
New vapor-liquid equilibria (VLE) data at 323.15, 333.15, 343.15, and 353.15 K and pressures up to 112.9 bar are reported for the carbon dioxide + 2-methyl-2-propanol system. The experimental method used in this work was a static analytical method with liquid and vapor phases sampling using a rapid online sampler injector (ROLSI™) coupled to a gas chromatograph (GC) for analysis. Measured VLE data and literature data for carbon dioxide + 2-methyl-2-propanol system were modeled with the Soave-Redlich-Kwong (SRK) cubic equation of state with classical van der Waals (two-parameter conventional mixing rule, 2PCMR) mixing rules. A single set of interaction parameters that lead to a correct phase behavior was used in this work to model the new VLE data and critical points of the mixtures in a wide range of temperature and pressure. The SRK prediction results were compared to the new data measured in this study and to available literature data.
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Research Interests: Engineering, Chemistry, Carbon Dioxide, Supercritical fluids, Environmental Sciences, and 11 moreEthanol, Van Der Waals, CHEMICAL SCIENCES, Supercritical carbon dioxide, Analytical Method, Experimental Measurement, Vapor Liquid Equilibria, Phase Behavior, Experimental Data, Experimental Method, and Equation of State
ABSTRACT Vapor−liquid (VLE), liquid−liquid (LLE), and vapor−liquid−liquid equilibria (VLLE) data for the carbon dioxide + n-pentadecane system at (293.15, 303.15, 313.15, 333.15, and 353.15) K up to 17.50 MPa and phase compositions of the... more
ABSTRACT Vapor−liquid (VLE), liquid−liquid (LLE), and vapor−liquid−liquid equilibria (VLLE) data for the carbon dioxide + n-pentadecane system at (293.15, 303.15, 313.15, 333.15, and 353.15) K up to 17.50 MPa and phase compositions of the two liquid phases and vapor phase as a function of temperature along the liquid−liquid−vapor (LLV) line are reported. The experimental method used in this work was a static-analytical method with liquid and vapor phase sampling. The new experimental results are discussed and compared with available literature data. Measured data and literature data for the carbon dioxide + n-pentadecane system were modeled with the Soave−Redlich−Kwong (SRK) EoS using classical van der Waals (two-parameter conventional mixing rule, 2PCMR) mixing rules. A single set of interaction parameters was used to predict the complex phase behavior in the binary mixture carbon dioxide + n-pentadecane.
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Vapour � liquid equilibrium, thermodynamic and volumetric properties were predicted for three pure hydrofluorocarbons: difluoromethane (R32), pentafluoroethane (R125) and 1,1,1,2 � tetrafluoroethane (R134a) as well as for binary and... more
Vapour � liquid equilibrium, thermodynamic and volumetric properties were predicted for three pure hydrofluorocarbons: difluoromethane (R32), pentafluoroethane (R125) and 1,1,1,2 � tetrafluoroethane (R134a) as well as for binary and ternary mixtures of these refrigerants. Three cubic equations of state GEOS3C, SRK (Soave � Redlich � Kwong) and PR (Peng � Robinson) were used. A wide comparison with literature experimental data was made. For the refrigerant mixtures, classical van der Waals mixing rules without interaction parameters were used. The GEOS3C equation, with three parameters estimated by matching several points on the saturation curve (vapor pressure and corresponding liquid volumes), compares favorably to other equations in literature, being simple enough for applications.
Vapor-liquid equilibria (VLE) data for the carbon dioxide + methanol system was measured at 293.15, 298.15, 310.15, and 323.15 K. Phase behavior measurements were made in a high-pressure visual cell with variable volume, based on the... more
Vapor-liquid equilibria (VLE) data for the carbon dioxide + methanol system was measured at 293.15, 298.15, 310.15, and 323.15 K.
Phase behavior measurements were made in a high-pressure visual cell with variable volume, based on the static-analytic method. The
pressure range under investigation was between 4.8 and 95.1 bar. The Soave-Redlich-Kwong (SRK)-EOS coupled with Huron-Vidal
(HV) mixing rules and a reduced UNIQUAC model, was used in a semi-predictive approach, in order to represent the phase behavior
(critical curve, isothermal VLE) of the system. The topology of the phase behavior of the carbon dioxide + methanol system is satisfactory
predicted with the SRK/HV-residual UNIQUAC model.
Phase behavior measurements were made in a high-pressure visual cell with variable volume, based on the static-analytic method. The
pressure range under investigation was between 4.8 and 95.1 bar. The Soave-Redlich-Kwong (SRK)-EOS coupled with Huron-Vidal
(HV) mixing rules and a reduced UNIQUAC model, was used in a semi-predictive approach, in order to represent the phase behavior
(critical curve, isothermal VLE) of the system. The topology of the phase behavior of the carbon dioxide + methanol system is satisfactory
predicted with the SRK/HV-residual UNIQUAC model.