The Experts below are selected from a list of 3828 Experts worldwide ranked by ideXlab platform
Suryadi Ismadji - One of the best experts on this subject based on the ideXlab platform.
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transesterification of leather tanning waste to biodiesel at Supercritical Condition kinetics and thermodynamics studies
Journal of Supercritical Fluids, 2013Co-Authors: Alfin Kurniawan, A. C. Suwandi, X S Zhao, Suryadi IsmadjiAbstract:Catalyst-free transesterification of leather tanning waste with high free fatty acid (FFA) content at Supercritical Condition was reported in this work. The experiments were performed in batch system at various temperatures (250–325 °C) under constant pressure of 12 MPa and methanol/fatty oil molar ratio of 40:1 for reaction time of 2–10 min. Kinetic modeling of formation of fatty acid methyl esters (FAMEs) that incorporate reversible esterification and non-reversible transesterification simultaneously was verified. The proposed semi-empirical model was fitted against kinetic experimental data over temperature range studied. The kinetic parameters (i.e. k′TE, k′E, and kE′) were determined by nonlinear regression fitting. Thermodynamic activation parameters of the reactions were evaluated based on activation complex theory (ACT) and the following results are obtained: ΔG‡ > 0, ΔH‡ > 0, and ΔS‡ < 0. The activation energy (Ea) of transesterification, forward and reverse esterification reactions was 36.01 kJ/mol, 28.38 kJ/mol, and 5.66 kJ/mol, respectively.
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Transesterification of leather tanning waste to biodiesel at Supercritical Condition: Kinetics and thermodynamics studies
Journal of Supercritical Fluids, 2013Co-Authors: L. K. Ong, A. C. Suwandi, C. X. Lin, X S Zhao, Aditya Kurniawan, Alfin Kurniawan, Suryadi IsmadjiAbstract:Catalyst-free transesterification of leather tanning waste with high free fatty acid (FFA) content at Supercritical Condition was reported in this work. The experiments were performed in batch system at various temperatures (250-325 °C) under constant pressure of 12 MPa and methanol/fatty oil molar ratio of 40:1 for reaction time of 2-10 min. Kinetic modeling of formation of fatty acid methyl esters (FAMEs) that incorporate reversible esterification and non-reversible transesterification simultaneously was verified. The proposed semi-empirical model was fitted against kinetic experimental data over temperature range studied. The kinetic parameters (i.e. k′TE, k′E, and kE′) were determined by nonlinear regression fitting. Thermodynamic activation parameters of the reactions were evaluated based on activation complex theory (ACT) and the following results are obtained: ΔG‡> 0, ΔH‡> 0, and ΔS‡< 0. The activation energy (Ea) of transesterification, forward and reverse esterification reactions was 36.01 kJ/mol, 28.38 kJ/mol, and 5.66 kJ/mol, respectively. © 2012 Elsevier B.V.
Alfin Kurniawan - One of the best experts on this subject based on the ideXlab platform.
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transesterification of leather tanning waste to biodiesel at Supercritical Condition kinetics and thermodynamics studies
Journal of Supercritical Fluids, 2013Co-Authors: Alfin Kurniawan, A. C. Suwandi, X S Zhao, Suryadi IsmadjiAbstract:Catalyst-free transesterification of leather tanning waste with high free fatty acid (FFA) content at Supercritical Condition was reported in this work. The experiments were performed in batch system at various temperatures (250–325 °C) under constant pressure of 12 MPa and methanol/fatty oil molar ratio of 40:1 for reaction time of 2–10 min. Kinetic modeling of formation of fatty acid methyl esters (FAMEs) that incorporate reversible esterification and non-reversible transesterification simultaneously was verified. The proposed semi-empirical model was fitted against kinetic experimental data over temperature range studied. The kinetic parameters (i.e. k′TE, k′E, and kE′) were determined by nonlinear regression fitting. Thermodynamic activation parameters of the reactions were evaluated based on activation complex theory (ACT) and the following results are obtained: ΔG‡ > 0, ΔH‡ > 0, and ΔS‡ < 0. The activation energy (Ea) of transesterification, forward and reverse esterification reactions was 36.01 kJ/mol, 28.38 kJ/mol, and 5.66 kJ/mol, respectively.
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Transesterification of leather tanning waste to biodiesel at Supercritical Condition: Kinetics and thermodynamics studies
Journal of Supercritical Fluids, 2013Co-Authors: L. K. Ong, A. C. Suwandi, C. X. Lin, X S Zhao, Aditya Kurniawan, Alfin Kurniawan, Suryadi IsmadjiAbstract:Catalyst-free transesterification of leather tanning waste with high free fatty acid (FFA) content at Supercritical Condition was reported in this work. The experiments were performed in batch system at various temperatures (250-325 °C) under constant pressure of 12 MPa and methanol/fatty oil molar ratio of 40:1 for reaction time of 2-10 min. Kinetic modeling of formation of fatty acid methyl esters (FAMEs) that incorporate reversible esterification and non-reversible transesterification simultaneously was verified. The proposed semi-empirical model was fitted against kinetic experimental data over temperature range studied. The kinetic parameters (i.e. k′TE, k′E, and kE′) were determined by nonlinear regression fitting. Thermodynamic activation parameters of the reactions were evaluated based on activation complex theory (ACT) and the following results are obtained: ΔG‡> 0, ΔH‡> 0, and ΔS‡< 0. The activation energy (Ea) of transesterification, forward and reverse esterification reactions was 36.01 kJ/mol, 28.38 kJ/mol, and 5.66 kJ/mol, respectively. © 2012 Elsevier B.V.
A. C. Suwandi - One of the best experts on this subject based on the ideXlab platform.
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transesterification of leather tanning waste to biodiesel at Supercritical Condition kinetics and thermodynamics studies
Journal of Supercritical Fluids, 2013Co-Authors: Alfin Kurniawan, A. C. Suwandi, X S Zhao, Suryadi IsmadjiAbstract:Catalyst-free transesterification of leather tanning waste with high free fatty acid (FFA) content at Supercritical Condition was reported in this work. The experiments were performed in batch system at various temperatures (250–325 °C) under constant pressure of 12 MPa and methanol/fatty oil molar ratio of 40:1 for reaction time of 2–10 min. Kinetic modeling of formation of fatty acid methyl esters (FAMEs) that incorporate reversible esterification and non-reversible transesterification simultaneously was verified. The proposed semi-empirical model was fitted against kinetic experimental data over temperature range studied. The kinetic parameters (i.e. k′TE, k′E, and kE′) were determined by nonlinear regression fitting. Thermodynamic activation parameters of the reactions were evaluated based on activation complex theory (ACT) and the following results are obtained: ΔG‡ > 0, ΔH‡ > 0, and ΔS‡ < 0. The activation energy (Ea) of transesterification, forward and reverse esterification reactions was 36.01 kJ/mol, 28.38 kJ/mol, and 5.66 kJ/mol, respectively.
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Transesterification of leather tanning waste to biodiesel at Supercritical Condition: Kinetics and thermodynamics studies
Journal of Supercritical Fluids, 2013Co-Authors: L. K. Ong, A. C. Suwandi, C. X. Lin, X S Zhao, Aditya Kurniawan, Alfin Kurniawan, Suryadi IsmadjiAbstract:Catalyst-free transesterification of leather tanning waste with high free fatty acid (FFA) content at Supercritical Condition was reported in this work. The experiments were performed in batch system at various temperatures (250-325 °C) under constant pressure of 12 MPa and methanol/fatty oil molar ratio of 40:1 for reaction time of 2-10 min. Kinetic modeling of formation of fatty acid methyl esters (FAMEs) that incorporate reversible esterification and non-reversible transesterification simultaneously was verified. The proposed semi-empirical model was fitted against kinetic experimental data over temperature range studied. The kinetic parameters (i.e. k′TE, k′E, and kE′) were determined by nonlinear regression fitting. Thermodynamic activation parameters of the reactions were evaluated based on activation complex theory (ACT) and the following results are obtained: ΔG‡> 0, ΔH‡> 0, and ΔS‡< 0. The activation energy (Ea) of transesterification, forward and reverse esterification reactions was 36.01 kJ/mol, 28.38 kJ/mol, and 5.66 kJ/mol, respectively. © 2012 Elsevier B.V.
X S Zhao - One of the best experts on this subject based on the ideXlab platform.
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transesterification of leather tanning waste to biodiesel at Supercritical Condition kinetics and thermodynamics studies
Journal of Supercritical Fluids, 2013Co-Authors: Alfin Kurniawan, A. C. Suwandi, X S Zhao, Suryadi IsmadjiAbstract:Catalyst-free transesterification of leather tanning waste with high free fatty acid (FFA) content at Supercritical Condition was reported in this work. The experiments were performed in batch system at various temperatures (250–325 °C) under constant pressure of 12 MPa and methanol/fatty oil molar ratio of 40:1 for reaction time of 2–10 min. Kinetic modeling of formation of fatty acid methyl esters (FAMEs) that incorporate reversible esterification and non-reversible transesterification simultaneously was verified. The proposed semi-empirical model was fitted against kinetic experimental data over temperature range studied. The kinetic parameters (i.e. k′TE, k′E, and kE′) were determined by nonlinear regression fitting. Thermodynamic activation parameters of the reactions were evaluated based on activation complex theory (ACT) and the following results are obtained: ΔG‡ > 0, ΔH‡ > 0, and ΔS‡ < 0. The activation energy (Ea) of transesterification, forward and reverse esterification reactions was 36.01 kJ/mol, 28.38 kJ/mol, and 5.66 kJ/mol, respectively.
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Transesterification of leather tanning waste to biodiesel at Supercritical Condition: Kinetics and thermodynamics studies
Journal of Supercritical Fluids, 2013Co-Authors: L. K. Ong, A. C. Suwandi, C. X. Lin, X S Zhao, Aditya Kurniawan, Alfin Kurniawan, Suryadi IsmadjiAbstract:Catalyst-free transesterification of leather tanning waste with high free fatty acid (FFA) content at Supercritical Condition was reported in this work. The experiments were performed in batch system at various temperatures (250-325 °C) under constant pressure of 12 MPa and methanol/fatty oil molar ratio of 40:1 for reaction time of 2-10 min. Kinetic modeling of formation of fatty acid methyl esters (FAMEs) that incorporate reversible esterification and non-reversible transesterification simultaneously was verified. The proposed semi-empirical model was fitted against kinetic experimental data over temperature range studied. The kinetic parameters (i.e. k′TE, k′E, and kE′) were determined by nonlinear regression fitting. Thermodynamic activation parameters of the reactions were evaluated based on activation complex theory (ACT) and the following results are obtained: ΔG‡> 0, ΔH‡> 0, and ΔS‡< 0. The activation energy (Ea) of transesterification, forward and reverse esterification reactions was 36.01 kJ/mol, 28.38 kJ/mol, and 5.66 kJ/mol, respectively. © 2012 Elsevier B.V.
Zhaoxia Dong - One of the best experts on this subject based on the ideXlab platform.
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Aggregation of CO2 and Organic Liquid Molecules at Near Critical and Supercritical Condition of CO2
Journal of Dispersion Science and Technology, 2014Co-Authors: Zihao Yang, Mingyuan Li, Bo Peng, Zhaoxia DongAbstract:In order to study the aggregation of CO2 and organic liquid molecules in the binary systems of CO2+ organic liquid at near critical and Supercritical Condition of CO2, the radial distribution function of CO2-organic liquid molecules and organic liquid–organic liquid molecules in the liquid phase of the CO2+ organic liquid systems is calculated by molecular dynamic simulation in this work and compared with the results of our previous works. The results of the research show that the aggregates of CO2–CO2 molecules, CO2-organic liquid molecules and organic liquid–organic liquid molecules are coexisted in the liquid phase of CO2+ organic liquid system, respectively.
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dispersion property of co2 in oil part 3 aggregation of co2 molecule in organic liquid at near critical and Supercritical Condition of co2
Journal of Dispersion Science and Technology, 2014Co-Authors: Zihao Yang, Mingyuan Li, Bo Peng, Zhaoxia DongAbstract:To study the dispersion property of CO2 in organic liquids, the solubility of CO2, the volume of CO2 + organic liquids under different pressure at 318.15 K were measured and the radial distribution function of CO2 molecule aggregate in the organic liquids was calculated by molecule dynamic simulation. The results show that the aggregate of CO2 molecules in the organic liquids is formed obviously; the aggregation and disperse property of CO2 molecule in the organic liquids is affected by the structure and polarity of the organic molecule at near critical and Supercritical Condition of CO2 dominantly.
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dispersion property of co2 in oil 1 volume expansion of co2 alkane at near critical and Supercritical Condition of co2
Journal of Chemical & Engineering Data, 2012Co-Authors: Zihao Yang, Mingyuan Li, Bo Peng, Zhaoxia DongAbstract:To investigate the effect of alkane molecular structure on the volume expansion of CO2 + alkane systems, the solubility of CO2 in hexane, octane, decane, and cyclohexane and the volume of CO2 + alkanes at different temperature and pressure was measured with a PVT apparatus. The results imply that the dispersion state of CO2 molecules in the alkane phase under near critical or Supercritical Condition of CO2 plays a dominate role in increasing the volume of CO2 + alkane systems. The solubility of CO2 in the alkanes, the volume expansion of the CO2 + alkane systems, and the London force operating within alkane molecules are strongly influenced by molecular structure of the alkanes and pressure.
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Dispersion Property of CO2 in Oil. 1. Volume Expansion of CO2 + Alkane at near Critical and Supercritical Condition of CO2
Journal of Chemical & Engineering Data, 2012Co-Authors: Zihao Yang, Mingyuan Li, Bo Peng, Zhaoxia DongAbstract:To investigate the effect of alkane molecular structure on the volume expansion of CO2 + alkane systems, the solubility of CO2 in hexane, octane, decane, and cyclohexane and the volume of CO2 + alkanes at different temperature and pressure was measured with a PVT apparatus. The results imply that the dispersion state of CO2 molecules in the alkane phase under near critical or Supercritical Condition of CO2 plays a dominate role in increasing the volume of CO2 + alkane systems. The solubility of CO2 in the alkanes, the volume expansion of the CO2 + alkane systems, and the London force operating within alkane molecules are strongly influenced by molecular structure of the alkanes and pressure.