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Dominique Richon - One of the best experts on this subject based on the ideXlab platform.
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Wax Solubility in Gaseous System: Thermodynamic Consistency Test of Experimental Data
Industrial & Engineering Chemistry Research, 2011Co-Authors: Amir H. Mohammadi, Ali Eslamimanesh, Dominique RichonAbstract:Wax deposition from natural gas can cause severe problems in production, transmission and processing operations. Accurate knowledge of wax solubility in natural gas system is required to avoid operating problems. Unfortunately, experimental measurements of solubilities of these compounds in gaseous systems are quite challenging. This is partly because concentrations of these solid substances in the gas phase are extremely low; this generally may result in generation of highly uncertain experimental data. In this paper, we present a thermodynamic Consistency Test based on the Gibbs-Duhem equation to determine the reliability of experimental solubility data of paraffin waxes (n-C24H50 to n-C33H68) available in the open literature. This Test uses the Peng- Robinson equation of state and two-fluid van der Waals (vdW2) mixing rules to represent the solubilities of solid waxy compounds insupercritical CO2and ethane. Theresults showthatalltheinvestigated experimentaldatathatarewellrepresentedbytheapplied thermodynamic model seem to be thermodynamically consistent.
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thermodynamic Consistency Test for experimental solubility data in carbon dioxide methane water system inside and outside gas hydrate formation region
Journal of Chemical & Engineering Data, 2011Co-Authors: Ali Eslamimanesh, Amir H. Mohammadi, Dominique RichonAbstract:Accurate knowledge of solubility in carbon dioxide/methane + water system over wide ranges of temperatures and pressures is essential for the petroleum industry. However, experimental measurements of such solubilities (especially in gas hydrate formation region) are challenging. For instance, concentrations of these gases in water are low, and furthermore reaching the equilibrium conditions near and inside gas hydrate formation region is a time-consuming process. Those difficulties may consequently result in generation of unreliable experimental data. This work aims at performing a thermodynamic Consistency Test based on an area approach to study the reliability of such experimental data reported in the literature and points out the suspected inconsistent data. A thermodynamic model based on the Valderrama modification of the Patel-Teja equation of state along with non-density dependent mixing rules is used to model the solubilities in the gas/vapor and liquid water phases. For modeling the solubility of ...
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Thermodynamic Consistency Test for Experimental Data of Sulfur Content of Hydrogen Sulfide
Industrial & Engineering Chemistry Research, 2011Co-Authors: Ali Eslamimanesh, Amir H. Mohammadi, Dominique RichonAbstract:Accurate knowledge of the sulfur content of hydrogen sulfide vapor is an important factor for prediction of the sulfur precipitation conditions in production of many sour natural gases. However, limited data regarding the sulfur content of hydrogen sulfide are available in the open literature. This is partly because of the fact that the concentration of sulfur in the vapor phase is very low. The measurement difficulties may consequently result in generating inaccurate and sometimes unreliable experimental data. This work aims at performing a thermodynamic Consistency Test based on area approach to study the reliability of some selected experimental data from the literature on the sulfur content of hydrogen sulfide vapor. The Peng−Robinson equation of state along with conventional mixing rules is used for thermodynamic modeling. In this model, sulfur molecules are treated as single molecules S8. The results show that almost 45% of all of the investigated experimental data are thermodynamically consistent, ...
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Thermodynamic Consistency Test for Experimental Data of Sulfur Content of Hydrogen Sulfide
Industrial and engineering chemistry, 2011Co-Authors: Ali Eslamimanesh, Amir H. Mohammadi, Dominique RichonAbstract:Accurate knowledge of the sulfur content of hydrogen sulfide vapor is an important factor for prediction of the sulfur precipitation conditions in production of many sour natural gases. However, limited data regarding the sulfur content of hydrogen sulfide are available in the open literature. This is partly because of the fact that the concentration of sulfur in the vapor phase is very low. The measurement difficulties may consequently result in generating inaccurate and sometimes unreliable experimental data. This work aims at performing a thermodynamic Consistency Test based on area approach to study the reliability of some selected experimental data from the literature on the sulfur content of hydrogen sulfide vapor. The Peng-Robinson equation of state along with conventional mixing rules is used for thermodynamic modeling. In this model, sulfur molecules are treated as single molecules S8. The results show that almost 45% of all of the investigated experimental data are thermodynamically consistent, 45% are inconsistent, and 10% are not fully consistent.
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Thermodynamic Consistency Test for Experimental Data of Water Content of Methane
AIChE Journal, 2011Co-Authors: Ali Eslamimanesh, Amir H. Mohammadi, Dominique RichonAbstract:Accurate knowledge of the water content of natural gases is an important factor to estimate the gas hydrate, ice, and condensed water formation conditions. However, the experimental data regarding the water content of gases in equilibrium with the gas hydrate, ice, or liquid water (near gas hydrate or ice formation region) are limited. This is partly because of the fact that concentration of water in the gaseous phase in equilibrium with gas hydrate, ice or liquid water (near gas hydrate or ice formation region) is very low considering that reaching the equilibrium conditions near and inside gas hydrate or ice formation region is time consuming process. The measurement difficulties may consequently result in generating unreliable experimental data. This work aims at performing a thermodynamic Consistency Test based on area approach to study the reliability of some experimental data reported in the literature on the water content of methane (the main component of natural gases) in equilibrium with the gas hydrate, ice, or liquid water (near gas hydrate or ice formation region). A discussion is made on the studied experimental data according to the performed Consistency Tests.
Ali Eslamimanesh - One of the best experts on this subject based on the ideXlab platform.
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Thermodynamic Consistency Test for isobaric experimental data of water content of methane
Fluid Phase Equilibria, 2013Co-Authors: Javad Kondori, Jafar Javanmardi, Ali Eslamimanesh, Amir H. MohammadiAbstract:a b s t r a c t An important factor to predict the gas hydrate formation conditions is accurate estimation of water content of natural gas. The water content of natural gas (mostly methane as the main component) is very low and consequently its measurement is difficult and time consuming. The experimental data for water content of methane (or other natural gas components) in equilibrium with gas hydrates/ice/liquid water (at low temperatures) are scarce. The measurement difficulties may eventually result in generat- ing unreliable experimental data or at least the data with high uncertainties. As a result, the available data should be checked for Consistency prior to further applications. The goal of this work is to present a new Consistency Test method for investigation of the corresponding phase equilibrium data at con- stant pressure (isobaric data). The proposed method is based on the Gibbs-Duhem equation and the area Test technique. In this method, HR (residual enthalpy) values are calculated at constant pressure. A thermodynamic model based on the Valderrama modification of the Patel-Teja equation of state along with non-density dependent mixing rules is applied for this purpose. The results show that the proposed Consistency Test can be applied with acceptable confidence, determining the quality of the investigated experimental data. © 2013 Elsevier B.V. All rights reserved.
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Wax Solubility in Gaseous System: Thermodynamic Consistency Test of Experimental Data
Industrial & Engineering Chemistry Research, 2011Co-Authors: Amir H. Mohammadi, Ali Eslamimanesh, Dominique RichonAbstract:Wax deposition from natural gas can cause severe problems in production, transmission and processing operations. Accurate knowledge of wax solubility in natural gas system is required to avoid operating problems. Unfortunately, experimental measurements of solubilities of these compounds in gaseous systems are quite challenging. This is partly because concentrations of these solid substances in the gas phase are extremely low; this generally may result in generation of highly uncertain experimental data. In this paper, we present a thermodynamic Consistency Test based on the Gibbs-Duhem equation to determine the reliability of experimental solubility data of paraffin waxes (n-C24H50 to n-C33H68) available in the open literature. This Test uses the Peng- Robinson equation of state and two-fluid van der Waals (vdW2) mixing rules to represent the solubilities of solid waxy compounds insupercritical CO2and ethane. Theresults showthatalltheinvestigated experimentaldatathatarewellrepresentedbytheapplied thermodynamic model seem to be thermodynamically consistent.
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thermodynamic Consistency Test for experimental solubility data in carbon dioxide methane water system inside and outside gas hydrate formation region
Journal of Chemical & Engineering Data, 2011Co-Authors: Ali Eslamimanesh, Amir H. Mohammadi, Dominique RichonAbstract:Accurate knowledge of solubility in carbon dioxide/methane + water system over wide ranges of temperatures and pressures is essential for the petroleum industry. However, experimental measurements of such solubilities (especially in gas hydrate formation region) are challenging. For instance, concentrations of these gases in water are low, and furthermore reaching the equilibrium conditions near and inside gas hydrate formation region is a time-consuming process. Those difficulties may consequently result in generation of unreliable experimental data. This work aims at performing a thermodynamic Consistency Test based on an area approach to study the reliability of such experimental data reported in the literature and points out the suspected inconsistent data. A thermodynamic model based on the Valderrama modification of the Patel-Teja equation of state along with non-density dependent mixing rules is used to model the solubilities in the gas/vapor and liquid water phases. For modeling the solubility of ...
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Thermodynamic Consistency Test for Experimental Data of Sulfur Content of Hydrogen Sulfide
Industrial & Engineering Chemistry Research, 2011Co-Authors: Ali Eslamimanesh, Amir H. Mohammadi, Dominique RichonAbstract:Accurate knowledge of the sulfur content of hydrogen sulfide vapor is an important factor for prediction of the sulfur precipitation conditions in production of many sour natural gases. However, limited data regarding the sulfur content of hydrogen sulfide are available in the open literature. This is partly because of the fact that the concentration of sulfur in the vapor phase is very low. The measurement difficulties may consequently result in generating inaccurate and sometimes unreliable experimental data. This work aims at performing a thermodynamic Consistency Test based on area approach to study the reliability of some selected experimental data from the literature on the sulfur content of hydrogen sulfide vapor. The Peng−Robinson equation of state along with conventional mixing rules is used for thermodynamic modeling. In this model, sulfur molecules are treated as single molecules S8. The results show that almost 45% of all of the investigated experimental data are thermodynamically consistent, ...
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Thermodynamic Consistency Test for Experimental Data of Sulfur Content of Hydrogen Sulfide
Industrial and engineering chemistry, 2011Co-Authors: Ali Eslamimanesh, Amir H. Mohammadi, Dominique RichonAbstract:Accurate knowledge of the sulfur content of hydrogen sulfide vapor is an important factor for prediction of the sulfur precipitation conditions in production of many sour natural gases. However, limited data regarding the sulfur content of hydrogen sulfide are available in the open literature. This is partly because of the fact that the concentration of sulfur in the vapor phase is very low. The measurement difficulties may consequently result in generating inaccurate and sometimes unreliable experimental data. This work aims at performing a thermodynamic Consistency Test based on area approach to study the reliability of some selected experimental data from the literature on the sulfur content of hydrogen sulfide vapor. The Peng-Robinson equation of state along with conventional mixing rules is used for thermodynamic modeling. In this model, sulfur molecules are treated as single molecules S8. The results show that almost 45% of all of the investigated experimental data are thermodynamically consistent, 45% are inconsistent, and 10% are not fully consistent.
Amir H. Mohammadi - One of the best experts on this subject based on the ideXlab platform.
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Thermodynamic Consistency Test for isobaric experimental data of water content of methane
Fluid Phase Equilibria, 2013Co-Authors: Javad Kondori, Jafar Javanmardi, Ali Eslamimanesh, Amir H. MohammadiAbstract:a b s t r a c t An important factor to predict the gas hydrate formation conditions is accurate estimation of water content of natural gas. The water content of natural gas (mostly methane as the main component) is very low and consequently its measurement is difficult and time consuming. The experimental data for water content of methane (or other natural gas components) in equilibrium with gas hydrates/ice/liquid water (at low temperatures) are scarce. The measurement difficulties may eventually result in generat- ing unreliable experimental data or at least the data with high uncertainties. As a result, the available data should be checked for Consistency prior to further applications. The goal of this work is to present a new Consistency Test method for investigation of the corresponding phase equilibrium data at con- stant pressure (isobaric data). The proposed method is based on the Gibbs-Duhem equation and the area Test technique. In this method, HR (residual enthalpy) values are calculated at constant pressure. A thermodynamic model based on the Valderrama modification of the Patel-Teja equation of state along with non-density dependent mixing rules is applied for this purpose. The results show that the proposed Consistency Test can be applied with acceptable confidence, determining the quality of the investigated experimental data. © 2013 Elsevier B.V. All rights reserved.
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Wax Solubility in Gaseous System: Thermodynamic Consistency Test of Experimental Data
Industrial & Engineering Chemistry Research, 2011Co-Authors: Amir H. Mohammadi, Ali Eslamimanesh, Dominique RichonAbstract:Wax deposition from natural gas can cause severe problems in production, transmission and processing operations. Accurate knowledge of wax solubility in natural gas system is required to avoid operating problems. Unfortunately, experimental measurements of solubilities of these compounds in gaseous systems are quite challenging. This is partly because concentrations of these solid substances in the gas phase are extremely low; this generally may result in generation of highly uncertain experimental data. In this paper, we present a thermodynamic Consistency Test based on the Gibbs-Duhem equation to determine the reliability of experimental solubility data of paraffin waxes (n-C24H50 to n-C33H68) available in the open literature. This Test uses the Peng- Robinson equation of state and two-fluid van der Waals (vdW2) mixing rules to represent the solubilities of solid waxy compounds insupercritical CO2and ethane. Theresults showthatalltheinvestigated experimentaldatathatarewellrepresentedbytheapplied thermodynamic model seem to be thermodynamically consistent.
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thermodynamic Consistency Test for experimental solubility data in carbon dioxide methane water system inside and outside gas hydrate formation region
Journal of Chemical & Engineering Data, 2011Co-Authors: Ali Eslamimanesh, Amir H. Mohammadi, Dominique RichonAbstract:Accurate knowledge of solubility in carbon dioxide/methane + water system over wide ranges of temperatures and pressures is essential for the petroleum industry. However, experimental measurements of such solubilities (especially in gas hydrate formation region) are challenging. For instance, concentrations of these gases in water are low, and furthermore reaching the equilibrium conditions near and inside gas hydrate formation region is a time-consuming process. Those difficulties may consequently result in generation of unreliable experimental data. This work aims at performing a thermodynamic Consistency Test based on an area approach to study the reliability of such experimental data reported in the literature and points out the suspected inconsistent data. A thermodynamic model based on the Valderrama modification of the Patel-Teja equation of state along with non-density dependent mixing rules is used to model the solubilities in the gas/vapor and liquid water phases. For modeling the solubility of ...
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Thermodynamic Consistency Test for Experimental Data of Sulfur Content of Hydrogen Sulfide
Industrial & Engineering Chemistry Research, 2011Co-Authors: Ali Eslamimanesh, Amir H. Mohammadi, Dominique RichonAbstract:Accurate knowledge of the sulfur content of hydrogen sulfide vapor is an important factor for prediction of the sulfur precipitation conditions in production of many sour natural gases. However, limited data regarding the sulfur content of hydrogen sulfide are available in the open literature. This is partly because of the fact that the concentration of sulfur in the vapor phase is very low. The measurement difficulties may consequently result in generating inaccurate and sometimes unreliable experimental data. This work aims at performing a thermodynamic Consistency Test based on area approach to study the reliability of some selected experimental data from the literature on the sulfur content of hydrogen sulfide vapor. The Peng−Robinson equation of state along with conventional mixing rules is used for thermodynamic modeling. In this model, sulfur molecules are treated as single molecules S8. The results show that almost 45% of all of the investigated experimental data are thermodynamically consistent, ...
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Thermodynamic Consistency Test for Experimental Data of Sulfur Content of Hydrogen Sulfide
Industrial and engineering chemistry, 2011Co-Authors: Ali Eslamimanesh, Amir H. Mohammadi, Dominique RichonAbstract:Accurate knowledge of the sulfur content of hydrogen sulfide vapor is an important factor for prediction of the sulfur precipitation conditions in production of many sour natural gases. However, limited data regarding the sulfur content of hydrogen sulfide are available in the open literature. This is partly because of the fact that the concentration of sulfur in the vapor phase is very low. The measurement difficulties may consequently result in generating inaccurate and sometimes unreliable experimental data. This work aims at performing a thermodynamic Consistency Test based on area approach to study the reliability of some selected experimental data from the literature on the sulfur content of hydrogen sulfide vapor. The Peng-Robinson equation of state along with conventional mixing rules is used for thermodynamic modeling. In this model, sulfur molecules are treated as single molecules S8. The results show that almost 45% of all of the investigated experimental data are thermodynamically consistent, 45% are inconsistent, and 10% are not fully consistent.
Kenji Ochi - One of the best experts on this subject based on the ideXlab platform.
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Thermodynamic Consistency Test of vapor-liquid equilibrium data: - Methanol ∼ water, benzene ∼ cyclohexane and ethyl methyl ketone ∼ water -
Fluid Phase Equilibria, 2001Co-Authors: Kazuo Kojima, Hung Man Moon, Kenji OchiAbstract:Abstract A thermodynamic Consistency Test of vapor-liquid equilibrium data at low pressure has been proposed which permits the over-all check of the data by combining three Tests; i) point Test and ii) area Test based on the generalized Gibbs-Duhem equation, and iii) infinite dilution Test on the related thermodynamic equations. The proposed method was applied to the binary miscible systems methanol ∼ water and benzene ∼ cyclohexane at normal pressure and at isothermal conditions, and the partially miscible system, ethyl methyl ketone ∼ water at normal pressure. The number of data sets is 61 in total. The thermodynamic Consistency Test permits the effective selection of the reliable data among several data sets.
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Thermodynamic Consistency Test of vapor—liquid equilibrium data—alcohol—hydrocarbon systems
Fluid Phase Equilibria, 2001Co-Authors: Hung Man Moon, Kenji Ochi, Kazuo KojimaAbstract:Abstract The thermodynamic Consistency Test of vapor—liquid equilibrium data has been carried out for 224 data sets—101 isobaric and 123 isothermal sets—of 35 binary alcohol—hydrocarbon systems by using the method proposed in our earlier work. The method permits an overall check of data by using three Tests: a point Test, an area Test and an infinite dilution Test. The Consistency Test gave the result that 60 data sets among 224 were reliable.
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thermodynamic Consistency Test of vapor liquid equilibrium data methanol water benzene cyclohexane and ethyl methyl ketone water
Fluid Phase Equilibria, 1990Co-Authors: Kazuo Kojima, Hung Man Moon, Kenji OchiAbstract:Abstract A thermodynamic Consistency Test of vapor-liquid equilibrium data at low pressure has been proposed which permits the over-all check of the data by combining three Tests; i) point Test and ii) area Test based on the generalized Gibbs-Duhem equation, and iii) infinite dilution Test on the related thermodynamic equations. The proposed method was applied to the binary miscible systems methanol ∼ water and benzene ∼ cyclohexane at normal pressure and at isothermal conditions, and the partially miscible system, ethyl methyl ketone ∼ water at normal pressure. The number of data sets is 61 in total. The thermodynamic Consistency Test permits the effective selection of the reliable data among several data sets.
Jose O Valderrama - One of the best experts on this subject based on the ideXlab platform.
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thermodynamic Consistency Test of high pressure gas liquid equilibrium data including both phases
Thermochimica Acta, 2010Co-Authors: Jose O Valderrama, Claudio A FaundezAbstract:Abstract A method to Test the thermodynamic Consistency of high pressure gas–liquid equilibrium data in binary mixtures which considers data for a single phase has been extended to propose an overall Test using the whole set of PTxy data. The method previously proposed by the authors was applied before to situations in which the concentration in the gas phase only was known (a solid dissolved in a high pressure gas) and to situations in which the concentration in the liquid phase only was known (ionic liquid and a high pressure gas). The extension is done here by proposing a combined analysis in which the Test is applied to both phases while the modeling is done using bubble pressure calculations as recommended in the literature. Data for water + carbon dioxide mixtures at nine temperatures and for pressures ranging from 100 to 1500 bar and temperatures 383 to 598 K were used. Results indicate that the proposed method is reliable and can be used to check the thermodynamic Consistency using all experimental phase equilibrium data available.
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thermodynamic Consistency Test of vapor liquid equilibrium data for mixtures containing ionic liquids
Industrial & Engineering Chemistry Research, 2008Co-Authors: Jose O Valderrama, Alfonso Reategui, Wilson W SangaAbstract:Vapor−liquid equilibrium of eight binary mixtures containing an ionic liquid and carbon dioxide have been Tested for thermodynamic Consistency. A method proposed by one of the authors has been modified to be applied to this special situation in which the gas phase contains practically one component (carbon dioxide) while the liquid phase contains both components in a wide concentration range. The method is based on the Gibbs−Duhem equation and on appropriate combination of equations of state, mixing rules, and combining rules. The Peng−Robinson equation of state with the Wong−Sandler mixing rules including the Van Laar model for the excess Gibbs free energy required in the mixing rules, are used. The experimental data were obtained from literature sources, and the adjustable parameters were found by minimizing the errors between predicted and experimental bubble pressure. It is shown that the proposed modified Consistency Test is accurate enough to decide about the thermodynamic Consistency of this type o...
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thermodynamic Consistency Test for high pressure gas solid solubility data of binary mixtures using genetic algorithms
Journal of Supercritical Fluids, 2006Co-Authors: Jose O Valderrama, Jack ZavaletaAbstract:A new computer method to Test the thermodynamic Consistency of incomplete phase equilibrium data in binary mixtures containing a solid solute and a supercritical fluid, is presented. The method is specially designed for treating solubility data that do not cover the whole range of concentration of the components in the mixture. The method is based on the Gibbs–Duhem equation and on the appropriate combination between equations of state, mixing rules and combining rules. The Peng–Robinson equation of state with the Wong–Sandler mixing rules including the van Laar model for the excess Gibbs free energy required in the mixing rules, are used. The model parameters are calculated using genetic algorithms and six gas–solid systems, including 19 isotherms and a total of 362 P–T–y data points were used for the study. The systems studied were binary mixtures containing supercritical carbon dioxide with naphthalene, biphenyl, 2,6-dimethylnaphthalene, phenanthrene, anthracene, and pyrene. The proposed Consistency Test method can be used with confidence to determine Consistency or inConsistency of a set of experimental solubility data of solids in high pressure gases.