CO<sub>2</sub> Hydrogenation for Ethanol Production: A Thermodynamic Analysis

Xinyi He

doi:doi:10.11648/j.ogce.20170506.14

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CO₂ Hydrogenation for Ethanol Production: A Thermodynamic Analysis

Xinyi He

Published in International Journal of Oil, Gas and Coal Engineering (Volume 5, Issue 6)

Received: 16 November 2017 Published: 21 November 2017

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Abstract

The thermodynamics of CO₂ hydrogenation to ethanol synthesis was analyzed by using the principle of Gibbs free energy minimization. According to the reaction mechanism, the product components of the reaction system were determined. The effects of reaction temperature, pressure and the molar ratio of hydrogen to carbon on the equilibrium products were investigated. The results show that methane has a high selectivity in equilibrium products. In order to analyze the influence of reaction conditions on the target product of ethanol, the thermodynamics of CO₂ hydrogenation was studied in methane free products. Since the process of CO₂ hydrogenation is accompanied by the CO hydrogenation reaction (FT synthesis), the CO hydrogenation process was also analyzed and compared with CO₂ hydrogenation. The results show that the CO hydrogenation has more advantages than the CO₂ hydrogenation, and that low temperature and high pressure can improve CO₂/CO conversion and the selectivity of ethanol. The suitable H₂/CO₂ molar ratio in the CO₂ hydrogenation is 3.0-5.0, while the suitable H₂/CO molar ratio in the CO hydrogenation is 0.5-2.0. The comparison of the simulation results with the related experimental results shows that the hydrogenation catalyst needs to be developed continuously to improve the conversion of raw materials and the selectivity to the target product.

Published in	International Journal of Oil, Gas and Coal Engineering (Volume 5, Issue 6)
DOI	10.11648/j.ogce.20170506.14
Page(s)	145-152
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2017. Published by Science Publishing Group

Keywords

Thermodynamics, CO₂ Hydrogenation, CO Hydrogenation, Ethanol, Methanol, Dimethyl Ether

References

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Xinyi He. (2017). CO2 Hydrogenation for Ethanol Production: A Thermodynamic Analysis. International Journal of Oil, Gas and Coal Engineering, 5(6), 145-152. https://doi.org/10.11648/j.ogce.20170506.14

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Xinyi He. CO2 Hydrogenation for Ethanol Production: A Thermodynamic Analysis. Int. J. Oil Gas Coal Eng. 2017, 5(6), 145-152. doi: 10.11648/j.ogce.20170506.14

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Xinyi He. CO2 Hydrogenation for Ethanol Production: A Thermodynamic Analysis. Int J Oil Gas Coal Eng. 2017;5(6):145-152. doi: 10.11648/j.ogce.20170506.14

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@article{10.11648/j.ogce.20170506.14,
  author = {Xinyi He},
  title = {CO2 Hydrogenation for Ethanol Production: A Thermodynamic Analysis},
  journal = {International Journal of Oil, Gas and Coal Engineering},
  volume = {5},
  number = {6},
  pages = {145-152},
  doi = {10.11648/j.ogce.20170506.14},
  url = {https://doi.org/10.11648/j.ogce.20170506.14},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ogce.20170506.14},
  abstract = {The thermodynamics of CO2 hydrogenation to ethanol synthesis was analyzed by using the principle of Gibbs free energy minimization. According to the reaction mechanism, the product components of the reaction system were determined. The effects of reaction temperature, pressure and the molar ratio of hydrogen to carbon on the equilibrium products were investigated. The results show that methane has a high selectivity in equilibrium products. In order to analyze the influence of reaction conditions on the target product of ethanol, the thermodynamics of CO2 hydrogenation was studied in methane free products. Since the process of CO2 hydrogenation is accompanied by the CO hydrogenation reaction (FT synthesis), the CO hydrogenation process was also analyzed and compared with CO2 hydrogenation. The results show that the CO hydrogenation has more advantages than the CO2 hydrogenation, and that low temperature and high pressure can improve CO2/CO conversion and the selectivity of ethanol. The suitable H2/CO2 molar ratio in the CO2 hydrogenation is 3.0-5.0, while the suitable H2/CO molar ratio in the CO hydrogenation is 0.5-2.0. The comparison of the simulation results with the related experimental results shows that the hydrogenation catalyst needs to be developed continuously to improve the conversion of raw materials and the selectivity to the target product.},
 year = {2017}
}

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TY  - JOUR
T1  - CO2 Hydrogenation for Ethanol Production: A Thermodynamic Analysis
AU  - Xinyi He
Y1  - 2017/11/21
PY  - 2017
N1  - https://doi.org/10.11648/j.ogce.20170506.14
DO  - 10.11648/j.ogce.20170506.14
T2  - International Journal of Oil, Gas and Coal Engineering
JF  - International Journal of Oil, Gas and Coal Engineering
JO  - International Journal of Oil, Gas and Coal Engineering
SP  - 145
EP  - 152
PB  - Science Publishing Group
SN  - 2376-7677
UR  - https://doi.org/10.11648/j.ogce.20170506.14
AB  - The thermodynamics of CO2 hydrogenation to ethanol synthesis was analyzed by using the principle of Gibbs free energy minimization. According to the reaction mechanism, the product components of the reaction system were determined. The effects of reaction temperature, pressure and the molar ratio of hydrogen to carbon on the equilibrium products were investigated. The results show that methane has a high selectivity in equilibrium products. In order to analyze the influence of reaction conditions on the target product of ethanol, the thermodynamics of CO2 hydrogenation was studied in methane free products. Since the process of CO2 hydrogenation is accompanied by the CO hydrogenation reaction (FT synthesis), the CO hydrogenation process was also analyzed and compared with CO2 hydrogenation. The results show that the CO hydrogenation has more advantages than the CO2 hydrogenation, and that low temperature and high pressure can improve CO2/CO conversion and the selectivity of ethanol. The suitable H2/CO2 molar ratio in the CO2 hydrogenation is 3.0-5.0, while the suitable H2/CO molar ratio in the CO hydrogenation is 0.5-2.0. The comparison of the simulation results with the related experimental results shows that the hydrogenation catalyst needs to be developed continuously to improve the conversion of raw materials and the selectivity to the target product.
VL  - 5
IS  - 6
ER  -

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Author Information

Xinyi He

School of Chemical Engineering and Technology, Tianjin University, Tianjin, China

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Xinyi He. (2017). CO2 Hydrogenation for Ethanol Production: A Thermodynamic Analysis. International Journal of Oil, Gas and Coal Engineering, 5(6), 145-152. https://doi.org/10.11648/j.ogce.20170506.14

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ACS Style

Xinyi He. CO2 Hydrogenation for Ethanol Production: A Thermodynamic Analysis. Int. J. Oil Gas Coal Eng. 2017, 5(6), 145-152. doi: 10.11648/j.ogce.20170506.14

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AMA Style

Xinyi He. CO2 Hydrogenation for Ethanol Production: A Thermodynamic Analysis. Int J Oil Gas Coal Eng. 2017;5(6):145-152. doi: 10.11648/j.ogce.20170506.14

Copy | Download

@article{10.11648/j.ogce.20170506.14,
  author = {Xinyi He},
  title = {CO2 Hydrogenation for Ethanol Production: A Thermodynamic Analysis},
  journal = {International Journal of Oil, Gas and Coal Engineering},
  volume = {5},
  number = {6},
  pages = {145-152},
  doi = {10.11648/j.ogce.20170506.14},
  url = {https://doi.org/10.11648/j.ogce.20170506.14},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ogce.20170506.14},
  abstract = {The thermodynamics of CO2 hydrogenation to ethanol synthesis was analyzed by using the principle of Gibbs free energy minimization. According to the reaction mechanism, the product components of the reaction system were determined. The effects of reaction temperature, pressure and the molar ratio of hydrogen to carbon on the equilibrium products were investigated. The results show that methane has a high selectivity in equilibrium products. In order to analyze the influence of reaction conditions on the target product of ethanol, the thermodynamics of CO2 hydrogenation was studied in methane free products. Since the process of CO2 hydrogenation is accompanied by the CO hydrogenation reaction (FT synthesis), the CO hydrogenation process was also analyzed and compared with CO2 hydrogenation. The results show that the CO hydrogenation has more advantages than the CO2 hydrogenation, and that low temperature and high pressure can improve CO2/CO conversion and the selectivity of ethanol. The suitable H2/CO2 molar ratio in the CO2 hydrogenation is 3.0-5.0, while the suitable H2/CO molar ratio in the CO hydrogenation is 0.5-2.0. The comparison of the simulation results with the related experimental results shows that the hydrogenation catalyst needs to be developed continuously to improve the conversion of raw materials and the selectivity to the target product.},
 year = {2017}
}

Copy | Download

TY  - JOUR
T1  - CO2 Hydrogenation for Ethanol Production: A Thermodynamic Analysis
AU  - Xinyi He
Y1  - 2017/11/21
PY  - 2017
N1  - https://doi.org/10.11648/j.ogce.20170506.14
DO  - 10.11648/j.ogce.20170506.14
T2  - International Journal of Oil, Gas and Coal Engineering
JF  - International Journal of Oil, Gas and Coal Engineering
JO  - International Journal of Oil, Gas and Coal Engineering
SP  - 145
EP  - 152
PB  - Science Publishing Group
SN  - 2376-7677
UR  - https://doi.org/10.11648/j.ogce.20170506.14
AB  - The thermodynamics of CO2 hydrogenation to ethanol synthesis was analyzed by using the principle of Gibbs free energy minimization. According to the reaction mechanism, the product components of the reaction system were determined. The effects of reaction temperature, pressure and the molar ratio of hydrogen to carbon on the equilibrium products were investigated. The results show that methane has a high selectivity in equilibrium products. In order to analyze the influence of reaction conditions on the target product of ethanol, the thermodynamics of CO2 hydrogenation was studied in methane free products. Since the process of CO2 hydrogenation is accompanied by the CO hydrogenation reaction (FT synthesis), the CO hydrogenation process was also analyzed and compared with CO2 hydrogenation. The results show that the CO hydrogenation has more advantages than the CO2 hydrogenation, and that low temperature and high pressure can improve CO2/CO conversion and the selectivity of ethanol. The suitable H2/CO2 molar ratio in the CO2 hydrogenation is 3.0-5.0, while the suitable H2/CO molar ratio in the CO hydrogenation is 0.5-2.0. The comparison of the simulation results with the related experimental results shows that the hydrogenation catalyst needs to be developed continuously to improve the conversion of raw materials and the selectivity to the target product.
VL  - 5
IS  - 6
ER  -

Copy | Download