Solubility of carbon dioxide in water: Some useful results for hydrate nucleation - Publication - Bridge of Knowledge

Search

Solubility of carbon dioxide in water: Some useful results for hydrate nucleation

Abstract

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.

Citations

  • 1 0

    CrossRef

  • 0

    Web of Science

  • 9

    Scopus

Authors (8)

Cite as

Full text

download paper
downloaded 14 times
Publication version
Accepted or Published Version
DOI:
Digital Object Identifier (open in new tab) 10.1063/5.0146618
License
Copyright (2023 AIP Publishing)

Keywords

Details

Category:
Articles
Type:
artykuły w czasopismach
Published in:
JOURNAL OF CHEMICAL PHYSICS no. 158,
ISSN: 0021-9606
Language:
English
Publication year:
2023
Bibliographic description:
Algaba J., Zerón I. M., Míguez J. M., Grabowska J., Blazquez S., Sanz E., Vega C., Blas F. J.: Solubility of carbon dioxide in water: Some useful results for hydrate nucleation// JOURNAL OF CHEMICAL PHYSICS -,iss. 158 (2023), s.184703-
DOI:
Digital Object Identifier (open in new tab) 10.1063/5.0146618
Sources of funding:
  • COST_FREE
Verified by:
Gdańsk University of Technology

seen 46 times

Recommended for you

Meta Tags