In this paper, the solubility of carbon dioxide (CO2) in water along the isobar of 400 bar is determined by computer simulations using the well-known TIP4P/Ice force field for water and the TraPPE model for CO2. In particular, the solubility of CO2 in water when in contact with the CO2 liquid phase and the solubility of CO2 in water when in contact with the hydrate have been determined. The solubility of CO2 in a liquid–liquid system decreases as the temperature increases. The solubility of CO2 in a hydrate–liquid system increases with temperature. The two curves intersect at a certain temperature that determines the dissociation temperature of the hydrate at 400 bar (T3). We compare the predictions with T3 obtained using the direct coexistence technique in a previous work. The results of both methods agree, and we suggest 290(2) K as the value of T3 for this system using the same cutoff distance for dispersive interactions. We also propose a novel and alternative route to evaluate the change in chemical potential for the formation of hydrates along the isobar. The new approach is based on the use of the solubility curve of CO2 when the aqueous solution is in contact with the hydrate phase. It considers rigorously the non-ideality of the aqueous solution of CO2, providing reliable values for the driving force for nucleation of hydrates in good agreement with other thermodynamic routes used. It is shown that the driving force for hydrate nucleation at 400 bar is larger for the methane hydrate than for the carbon dioxide hydrate when compared at the same supercooling. We have also analyzed and discussed the effect of the cutoff distance of dispersive interactions and the occupancy of CO2 on the driving force for nucleation of the hydrate.
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14 May 2023
Research Article|
May 09 2023
Solubility of carbon dioxide in water: Some useful results for hydrate nucleation
Special Collection:
Nucleation: Current Understanding Approaching 150 Years After Gibbs
Jesús Algaba
;
Jesús Algaba
(Conceptualization, Data curation, Formal analysis, Investigation, Writing – original draft, Writing – review & editing)
1
Laboratorio de Simulación Molecular y Química Computacional, CIQSO-Centro de Investigación en Química Sostenible and Departamento de Ciencias Integradas, Universidad de Huelva
, 21006 Huelva, Spain
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Iván M. Zerón
;
Iván M. Zerón
(Conceptualization, Data curation, Investigation, Methodology, Supervision, Writing – review & editing)
1
Laboratorio de Simulación Molecular y Química Computacional, CIQSO-Centro de Investigación en Química Sostenible and Departamento de Ciencias Integradas, Universidad de Huelva
, 21006 Huelva, Spain
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José Manuel Míguez
;
José Manuel Míguez
(Conceptualization, Data curation, Investigation, Methodology, Writing – review & editing)
1
Laboratorio de Simulación Molecular y Química Computacional, CIQSO-Centro de Investigación en Química Sostenible and Departamento de Ciencias Integradas, Universidad de Huelva
, 21006 Huelva, Spain
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Joanna Grabowska
;
Joanna Grabowska
(Investigation, Methodology, Writing – review & editing)
2
Department of Physical Chemistry, Faculty of Chemistry and BioTechMed Center, Gdansk University of Technology
, ul. Narutowicza 11/12, 80-233 Gdansk, Poland
3
Dpto. Química Física, Fac. Ciencias Químicas, Universidad Complutense de Madrid
, 28040 Madrid, Spain
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Samuel Blazquez
;
Samuel Blazquez
(Investigation, Methodology, Writing – review & editing)
3
Dpto. Química Física, Fac. Ciencias Químicas, Universidad Complutense de Madrid
, 28040 Madrid, Spain
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Eduardo Sanz
;
Eduardo Sanz
(Investigation, Methodology, Writing – review & editing)
3
Dpto. Química Física, Fac. Ciencias Químicas, Universidad Complutense de Madrid
, 28040 Madrid, Spain
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Carlos Vega
;
Carlos Vega
(Conceptualization, Investigation, Methodology, Writing – review & editing)
3
Dpto. Química Física, Fac. Ciencias Químicas, Universidad Complutense de Madrid
, 28040 Madrid, Spain
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Felipe J. Blas
Felipe J. Blas
a)
(Conceptualization, Investigation, Methodology, Supervision, Writing – original draft, Writing – review & editing)
1
Laboratorio de Simulación Molecular y Química Computacional, CIQSO-Centro de Investigación en Química Sostenible and Departamento de Ciencias Integradas, Universidad de Huelva
, 21006 Huelva, Spain
a)Author to whom correspondence should be addressed: felipe@uhu.es
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a)Author to whom correspondence should be addressed: felipe@uhu.es
Note: This paper is part of the JCP Special Topic on Nucleation: Current Understanding Approaching 150 Years After Gibbs.
J. Chem. Phys. 158, 184703 (2023)
Article history
Received:
February 15 2023
Accepted:
April 18 2023
Citation
Jesús Algaba, Iván M. Zerón, José Manuel Míguez, Joanna Grabowska, Samuel Blazquez, Eduardo Sanz, Carlos Vega, Felipe J. Blas; Solubility of carbon dioxide in water: Some useful results for hydrate nucleation. J. Chem. Phys. 14 May 2023; 158 (18): 184703. https://doi.org/10.1063/5.0146618
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