The Experts below are selected from a list of 288 Experts worldwide ranked by ideXlab platform
Pierre-alexandre Glaude - One of the best experts on this subject based on the ideXlab platform.
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Acetylene pyrolysis in a jet-stirred-reactor for low pressure Gas Carburizing process – Experiments, kinetic modeling and mixing intensity investigations by CFD simulation
Chemical Engineering Science, 2019Co-Authors: Tsilla Bensabath, Hubert Monnier, Pierre-alexandre GlaudeAbstract:Abstract Low-pressure Gas Carburizing is used to harden steel, it has been shown to be a source of considerable PAH (Polycyclic Aromatic Hydrocarbon) pollution. Some PAH, like benzo[a]pyrene, are carcinogenic, and activities such as furnace maintenance and cleaning operations may thus represent a risk to workers. Occupational exposure during these operations should therefore be reduced. Benzene is a specific chemical marker of PAH, and the aim of the study was to understand its formation. Acetylene pyrolysis was experimentally performed in a jet-stirred-reactor in the laboratory, in conditions close to those encountered in industrial processes (1173 K and 8 kPa). Products of pyrolysis were analyzed by Gas chromatography (TCD, FID) at the outlet from the reaction zone. The influence of residence time in the reactor was studied. A detailed kinetic model assuming an ideal continuous stirred tank reactor was used to describe the formation of chemical compounds and validate experimental data. CFD simulations were performed to characterize the reactor’s hydrodynamics by applying the theory of the free jet. They allowed putting forward one explanation to understand the deviation between experiments and the kinetic model.
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Acetylene pyrolysis in a jet-stirred-reactor for low pressure Gas Carburizing process- Experiments, kinetic modeling and mixing intensity investigations by CFD simulation
Chemical Engineering Science, 2019Co-Authors: Tsilla Bensabath, Hubert Monnier, Pierre-alexandre GlaudeAbstract:Low-pressure Gas Carburizing is used to harden steel, it has been shown to be a source of considerable PAH (Polycyclic Aromatic Hydrocarbon) pollution. Some PAH, like benzo[a]pyrene, are carcinogenic, and activities such as furnace maintenance and cleaning operations may thus represent a risk to workers. Occupational exposure during these operations should therefore be reduced. Benzene is a specific chemical marker of PAH, and the aim of the study was to understand its formation. Acetylene pyrolysis was experimentally performed in a jet-stirred-reactor in the laboratory, in conditions close to those encountered in industrial processes (1173 K and 8 kPa). Products of pyrolysis were analyzed by Gas chromatography (TCD, FID) at the outlet from the reaction zone. The influence of residence time in the reactor was studied. A detailed kinetic model assuming an ideal continuous stirred tank reactor was used to describe the formation of chemical compounds and validate experimental data. CFD simulations were performed to characterize the reactor’s hydrodynamics by applying the theory of the free jet. They allowed putting forward one explanation to understand the deviation between experiments and the kinetic model.
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Polycyclic aromatic hydrocarbon (PAH) formation during acetylene pyrolysis in tubular reactor under low pressure Carburizing conditions
Chemical Engineering Science, 2019Co-Authors: Tsilla Bensabath, Hubert Monnier, Pierre-alexandre GlaudeAbstract:Low-pressure Carburizing involves hydrocarbon pyrolysis, which leads to a fast Gas-phase formation of polycyclic aromatic hydrocarbons (PAHs), some of which, such as benzo[a]pyrene, are carcinogenic. Workers can be exposed to these PAHs during maintenance and cleaning operations of Carburizing furnaces. Experiments of acetylene pyrolysis were carried out in conditions close to low-pressure Gas Carburizing processes, at 1173 K and 8 kPa, in tubular reactors. At the outlet of the reaction zone, the reactant and the reaction products were analyzed by Gas chromatography (TCD, FID and MS). Amongst other products, 16 PAHs classified as priority pollutants by the United States Environmental Protection Agency (US EPA) were observed and quantified. The study of the influence of residence time and of inlet reactant concentration shows that amounts of PAHs increase with residence time at low acetylene concentration but slightly decrease with pure acetylene due to the conversion of PAHs into soot. Results were compared to simulation results obtained with a detailed kinetic model of light hydrocarbon pyrolysis.
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Detailed kinetic modeling of the formation of toxic polycyclic aromatic hydrocarbons (PAHs) coming from pyrolysis in low-pressure Gas Carburizing conditions
Journal of Analytical and Applied Pyrolysis, 2016Co-Authors: Tsilla Bensabath, Hubert Monnier, Pierre-alexandre GlaudeAbstract:Hydrocarbon pyrolysis in low-pressure Gas Carburizing conditions leads to Gas phase reactions, which produce polycyclic aromatic hydrocarbons (PAHs), some of which, such as benzo[a]pyrene, are carcinogenic. Workers can be exposed to these PAHs during maintenance and cleaning operations of Carburizing furnaces. The aim of the study is the prediction of the formation of sixteen PAHs considered as priority pollutants by the Environmental Protection Agency in the United States (US EPA). A model has been implemented in order to describe the reaction pathways leading to their formation. It was validated using experimental data from the literature, obtained during pyrolysis of different hydrocarbons such as acetylene and ethylene. Flux analyses were realized in order to determine main reaction pathways leading to benzene depending on the reactant. Simulations were also performed to compare PAH formation between acetylene, ethylene and propane pyrolysis.
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Modeling of Polycyclic Aromatic Hydrocarbon (PAH) formation during hydrocarbon pyrolysis
2015Co-Authors: Tsilla Bensabath, Hubert Monnier, Catherine Champmartin, Pierre-alexandre GlaudeAbstract:Hydrocarbon pyrolysis in low-Pressure Gas Carburizing conditions drives to Gas phase reactions which lead to the production of Polycyclic Aromatic Hydrocarbons (PAHs). These PAHs are afterwards responsible for soot formation. The aim of the study is to predict the formation of mainly sixteen PAHs considered as priority pollutants by the Environmental Protection Agency in the United States (US EPA). Some of them, like benzo(a)pyrene, are carcinogens. A model has been implemented in order to describe the reaction pathways leading to these PAHs. The model was validated using experimental data from the literature, obtained in the case of pyrolysis of different hydrocarbons. Results for ethylene pyrolysis are more specifically presented in this paper. Flux analyses were realized in order to determine the main reaction pathways leading to benzene.
Tsilla Bensabath - One of the best experts on this subject based on the ideXlab platform.
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Acetylene pyrolysis in a jet-stirred-reactor for low pressure Gas Carburizing process – Experiments, kinetic modeling and mixing intensity investigations by CFD simulation
Chemical Engineering Science, 2019Co-Authors: Tsilla Bensabath, Hubert Monnier, Pierre-alexandre GlaudeAbstract:Abstract Low-pressure Gas Carburizing is used to harden steel, it has been shown to be a source of considerable PAH (Polycyclic Aromatic Hydrocarbon) pollution. Some PAH, like benzo[a]pyrene, are carcinogenic, and activities such as furnace maintenance and cleaning operations may thus represent a risk to workers. Occupational exposure during these operations should therefore be reduced. Benzene is a specific chemical marker of PAH, and the aim of the study was to understand its formation. Acetylene pyrolysis was experimentally performed in a jet-stirred-reactor in the laboratory, in conditions close to those encountered in industrial processes (1173 K and 8 kPa). Products of pyrolysis were analyzed by Gas chromatography (TCD, FID) at the outlet from the reaction zone. The influence of residence time in the reactor was studied. A detailed kinetic model assuming an ideal continuous stirred tank reactor was used to describe the formation of chemical compounds and validate experimental data. CFD simulations were performed to characterize the reactor’s hydrodynamics by applying the theory of the free jet. They allowed putting forward one explanation to understand the deviation between experiments and the kinetic model.
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Acetylene pyrolysis in a jet-stirred-reactor for low pressure Gas Carburizing process- Experiments, kinetic modeling and mixing intensity investigations by CFD simulation
Chemical Engineering Science, 2019Co-Authors: Tsilla Bensabath, Hubert Monnier, Pierre-alexandre GlaudeAbstract:Low-pressure Gas Carburizing is used to harden steel, it has been shown to be a source of considerable PAH (Polycyclic Aromatic Hydrocarbon) pollution. Some PAH, like benzo[a]pyrene, are carcinogenic, and activities such as furnace maintenance and cleaning operations may thus represent a risk to workers. Occupational exposure during these operations should therefore be reduced. Benzene is a specific chemical marker of PAH, and the aim of the study was to understand its formation. Acetylene pyrolysis was experimentally performed in a jet-stirred-reactor in the laboratory, in conditions close to those encountered in industrial processes (1173 K and 8 kPa). Products of pyrolysis were analyzed by Gas chromatography (TCD, FID) at the outlet from the reaction zone. The influence of residence time in the reactor was studied. A detailed kinetic model assuming an ideal continuous stirred tank reactor was used to describe the formation of chemical compounds and validate experimental data. CFD simulations were performed to characterize the reactor’s hydrodynamics by applying the theory of the free jet. They allowed putting forward one explanation to understand the deviation between experiments and the kinetic model.
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Polycyclic aromatic hydrocarbon (PAH) formation during acetylene pyrolysis in tubular reactor under low pressure Carburizing conditions
Chemical Engineering Science, 2019Co-Authors: Tsilla Bensabath, Hubert Monnier, Pierre-alexandre GlaudeAbstract:Low-pressure Carburizing involves hydrocarbon pyrolysis, which leads to a fast Gas-phase formation of polycyclic aromatic hydrocarbons (PAHs), some of which, such as benzo[a]pyrene, are carcinogenic. Workers can be exposed to these PAHs during maintenance and cleaning operations of Carburizing furnaces. Experiments of acetylene pyrolysis were carried out in conditions close to low-pressure Gas Carburizing processes, at 1173 K and 8 kPa, in tubular reactors. At the outlet of the reaction zone, the reactant and the reaction products were analyzed by Gas chromatography (TCD, FID and MS). Amongst other products, 16 PAHs classified as priority pollutants by the United States Environmental Protection Agency (US EPA) were observed and quantified. The study of the influence of residence time and of inlet reactant concentration shows that amounts of PAHs increase with residence time at low acetylene concentration but slightly decrease with pure acetylene due to the conversion of PAHs into soot. Results were compared to simulation results obtained with a detailed kinetic model of light hydrocarbon pyrolysis.
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Detailed kinetic modeling of the formation of toxic polycyclic aromatic hydrocarbons (PAHs) coming from pyrolysis in low-pressure Gas Carburizing conditions
Journal of Analytical and Applied Pyrolysis, 2016Co-Authors: Tsilla Bensabath, Hubert Monnier, Pierre-alexandre GlaudeAbstract:Hydrocarbon pyrolysis in low-pressure Gas Carburizing conditions leads to Gas phase reactions, which produce polycyclic aromatic hydrocarbons (PAHs), some of which, such as benzo[a]pyrene, are carcinogenic. Workers can be exposed to these PAHs during maintenance and cleaning operations of Carburizing furnaces. The aim of the study is the prediction of the formation of sixteen PAHs considered as priority pollutants by the Environmental Protection Agency in the United States (US EPA). A model has been implemented in order to describe the reaction pathways leading to their formation. It was validated using experimental data from the literature, obtained during pyrolysis of different hydrocarbons such as acetylene and ethylene. Flux analyses were realized in order to determine main reaction pathways leading to benzene depending on the reactant. Simulations were also performed to compare PAH formation between acetylene, ethylene and propane pyrolysis.
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Modeling of Polycyclic Aromatic Hydrocarbon (PAH) formation during hydrocarbon pyrolysis
2015Co-Authors: Tsilla Bensabath, Hubert Monnier, Catherine Champmartin, Pierre-alexandre GlaudeAbstract:Hydrocarbon pyrolysis in low-Pressure Gas Carburizing conditions drives to Gas phase reactions which lead to the production of Polycyclic Aromatic Hydrocarbons (PAHs). These PAHs are afterwards responsible for soot formation. The aim of the study is to predict the formation of mainly sixteen PAHs considered as priority pollutants by the Environmental Protection Agency in the United States (US EPA). Some of them, like benzo(a)pyrene, are carcinogens. A model has been implemented in order to describe the reaction pathways leading to these PAHs. The model was validated using experimental data from the literature, obtained in the case of pyrolysis of different hydrocarbons. Results for ethylene pyrolysis are more specifically presented in this paper. Flux analyses were realized in order to determine the main reaction pathways leading to benzene.
Hubert Monnier - One of the best experts on this subject based on the ideXlab platform.
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Acetylene pyrolysis in a jet-stirred-reactor for low pressure Gas Carburizing process – Experiments, kinetic modeling and mixing intensity investigations by CFD simulation
Chemical Engineering Science, 2019Co-Authors: Tsilla Bensabath, Hubert Monnier, Pierre-alexandre GlaudeAbstract:Abstract Low-pressure Gas Carburizing is used to harden steel, it has been shown to be a source of considerable PAH (Polycyclic Aromatic Hydrocarbon) pollution. Some PAH, like benzo[a]pyrene, are carcinogenic, and activities such as furnace maintenance and cleaning operations may thus represent a risk to workers. Occupational exposure during these operations should therefore be reduced. Benzene is a specific chemical marker of PAH, and the aim of the study was to understand its formation. Acetylene pyrolysis was experimentally performed in a jet-stirred-reactor in the laboratory, in conditions close to those encountered in industrial processes (1173 K and 8 kPa). Products of pyrolysis were analyzed by Gas chromatography (TCD, FID) at the outlet from the reaction zone. The influence of residence time in the reactor was studied. A detailed kinetic model assuming an ideal continuous stirred tank reactor was used to describe the formation of chemical compounds and validate experimental data. CFD simulations were performed to characterize the reactor’s hydrodynamics by applying the theory of the free jet. They allowed putting forward one explanation to understand the deviation between experiments and the kinetic model.
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Acetylene pyrolysis in a jet-stirred-reactor for low pressure Gas Carburizing process- Experiments, kinetic modeling and mixing intensity investigations by CFD simulation
Chemical Engineering Science, 2019Co-Authors: Tsilla Bensabath, Hubert Monnier, Pierre-alexandre GlaudeAbstract:Low-pressure Gas Carburizing is used to harden steel, it has been shown to be a source of considerable PAH (Polycyclic Aromatic Hydrocarbon) pollution. Some PAH, like benzo[a]pyrene, are carcinogenic, and activities such as furnace maintenance and cleaning operations may thus represent a risk to workers. Occupational exposure during these operations should therefore be reduced. Benzene is a specific chemical marker of PAH, and the aim of the study was to understand its formation. Acetylene pyrolysis was experimentally performed in a jet-stirred-reactor in the laboratory, in conditions close to those encountered in industrial processes (1173 K and 8 kPa). Products of pyrolysis were analyzed by Gas chromatography (TCD, FID) at the outlet from the reaction zone. The influence of residence time in the reactor was studied. A detailed kinetic model assuming an ideal continuous stirred tank reactor was used to describe the formation of chemical compounds and validate experimental data. CFD simulations were performed to characterize the reactor’s hydrodynamics by applying the theory of the free jet. They allowed putting forward one explanation to understand the deviation between experiments and the kinetic model.
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Polycyclic aromatic hydrocarbon (PAH) formation during acetylene pyrolysis in tubular reactor under low pressure Carburizing conditions
Chemical Engineering Science, 2019Co-Authors: Tsilla Bensabath, Hubert Monnier, Pierre-alexandre GlaudeAbstract:Low-pressure Carburizing involves hydrocarbon pyrolysis, which leads to a fast Gas-phase formation of polycyclic aromatic hydrocarbons (PAHs), some of which, such as benzo[a]pyrene, are carcinogenic. Workers can be exposed to these PAHs during maintenance and cleaning operations of Carburizing furnaces. Experiments of acetylene pyrolysis were carried out in conditions close to low-pressure Gas Carburizing processes, at 1173 K and 8 kPa, in tubular reactors. At the outlet of the reaction zone, the reactant and the reaction products were analyzed by Gas chromatography (TCD, FID and MS). Amongst other products, 16 PAHs classified as priority pollutants by the United States Environmental Protection Agency (US EPA) were observed and quantified. The study of the influence of residence time and of inlet reactant concentration shows that amounts of PAHs increase with residence time at low acetylene concentration but slightly decrease with pure acetylene due to the conversion of PAHs into soot. Results were compared to simulation results obtained with a detailed kinetic model of light hydrocarbon pyrolysis.
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Detailed kinetic modeling of the formation of toxic polycyclic aromatic hydrocarbons (PAHs) coming from pyrolysis in low-pressure Gas Carburizing conditions
Journal of Analytical and Applied Pyrolysis, 2016Co-Authors: Tsilla Bensabath, Hubert Monnier, Pierre-alexandre GlaudeAbstract:Hydrocarbon pyrolysis in low-pressure Gas Carburizing conditions leads to Gas phase reactions, which produce polycyclic aromatic hydrocarbons (PAHs), some of which, such as benzo[a]pyrene, are carcinogenic. Workers can be exposed to these PAHs during maintenance and cleaning operations of Carburizing furnaces. The aim of the study is the prediction of the formation of sixteen PAHs considered as priority pollutants by the Environmental Protection Agency in the United States (US EPA). A model has been implemented in order to describe the reaction pathways leading to their formation. It was validated using experimental data from the literature, obtained during pyrolysis of different hydrocarbons such as acetylene and ethylene. Flux analyses were realized in order to determine main reaction pathways leading to benzene depending on the reactant. Simulations were also performed to compare PAH formation between acetylene, ethylene and propane pyrolysis.
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Modeling of Polycyclic Aromatic Hydrocarbon (PAH) formation during hydrocarbon pyrolysis
2015Co-Authors: Tsilla Bensabath, Hubert Monnier, Catherine Champmartin, Pierre-alexandre GlaudeAbstract:Hydrocarbon pyrolysis in low-Pressure Gas Carburizing conditions drives to Gas phase reactions which lead to the production of Polycyclic Aromatic Hydrocarbons (PAHs). These PAHs are afterwards responsible for soot formation. The aim of the study is to predict the formation of mainly sixteen PAHs considered as priority pollutants by the Environmental Protection Agency in the United States (US EPA). Some of them, like benzo(a)pyrene, are carcinogens. A model has been implemented in order to describe the reaction pathways leading to these PAHs. The model was validated using experimental data from the literature, obtained in the case of pyrolysis of different hydrocarbons. Results for ethylene pyrolysis are more specifically presented in this paper. Flux analyses were realized in order to determine the main reaction pathways leading to benzene.
M. Gergely - One of the best experts on this subject based on the ideXlab platform.
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Computer prediction of process parameters of two-stage Gas Carburizing
Journal of Heat Treating, 1990Co-Authors: Tamás Réti, Mihály Réger, M. GergelyAbstract:A computer-aided method based on a simplified mathematical model is described for predicting the time parameters of the two-stage boost-diffuse Gas Carburizing.
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Computer prediction of process parameters of two-stage Gas Carburizing
Journal of Heat Treating, 1990Co-Authors: Tamás Réti, Mihály Réger, M. GergelyAbstract:A computer-aided method based on a simplified mathematical model is described for predicting the time parameters of the two-stage boost-diffuse Gas Carburizing. The main advantage of the computational algorithm lies in its simplicity. Computer times are much shorter than those required for finite difference calculations. The required input data are the case depth, the surface carbon content, the chemical composition of the case hardenable steel, and the Carburizing and diffusion temperatures. The output data are the predicted times for both the boost and the diffusion period and the calculated carbon profile. The application of the computation method is demonstrated by practical examples.
Tamás Réti - One of the best experts on this subject based on the ideXlab platform.
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Computer prediction of process parameters of two-stage Gas Carburizing
Journal of Heat Treating, 1990Co-Authors: Tamás Réti, Mihály Réger, M. GergelyAbstract:A computer-aided method based on a simplified mathematical model is described for predicting the time parameters of the two-stage boost-diffuse Gas Carburizing.
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Computer prediction of process parameters of two-stage Gas Carburizing
Journal of Heat Treating, 1990Co-Authors: Tamás Réti, Mihály Réger, M. GergelyAbstract:A computer-aided method based on a simplified mathematical model is described for predicting the time parameters of the two-stage boost-diffuse Gas Carburizing. The main advantage of the computational algorithm lies in its simplicity. Computer times are much shorter than those required for finite difference calculations. The required input data are the case depth, the surface carbon content, the chemical composition of the case hardenable steel, and the Carburizing and diffusion temperatures. The output data are the predicted times for both the boost and the diffusion period and the calculated carbon profile. The application of the computation method is demonstrated by practical examples.
