Experimental measurements and thermodynamic modeling of dissociation pressure of CO2 hydrate in sulfate solutions
Notice bibliographique
Résumé
• We report new data on dissociation pressure of CO 2 hydrate in sulfate solutions. • Sulfate solutions exhibit thermodynamic inhibition effects on CO 2 hydrate. • CuSO 4 solutions show slight inhibition effects on CO 2 hydrate. • The predicted dissociation pressure agrees reasonably well with the measured data. • The dissociation enthalpies depend on temperature and sulfate salt concentration. Carbon capture and storage (CCS) has been a popular strategy to mitigate climate change and has attracted significant attention from both industry and academia. CO 2 can be stored in the form of CO 2 hydrate in deeper locations in an ocean, which makes it a potential option for CO 2 sequestration. Dissolved salts in the ocean brine can significantly affect the dissociation pressure of CO 2 hydrate. Sulfate salts are one of the most common salt species in the oceanic brine. Although various experimental studies have been conducted to investigate the phase behavior of CO 2 hydrate in brine, few studies focus on the effect of sulfate salts on the dissociation pressure of CO 2 hydrate. In this study, we build an in-house experimental setup to investigate the effect of monovalent and divalent sulfate salts on the dissociation pressure of CO 2 hydrate. The dissociation pressure of CO 2 hydrate in Na 2 SO 4 , K 2 SO 4 , MgSO 4 , and CuSO 4 aqueous solutions is measured using the isochoric pressure search method at different concentrations over the temperature range of 274.36 – 282.15 K and the pressure range of 1.50 – 4.03 MPa. A hybrid methodology incorporating the Soave-Redlich-Kwong Equation of State (SRK EOS), the van der Waals-Platteeuw (vdW-P) model, and the Pitzer model is applied to predict the dissociation pressure of CO 2 in sulfate solutions. In addition, the dissociation enthalpies of CO 2 hydrate in these sulfate solutions are calculated using the Clausius-Clapeyron equation based on the measured dissociation points. The experimental results show that the dissociation pressure of CO 2 hydrate in Na 2 SO 4 , K 2 SO 4 , and MgSO 4 solutions is higher than that in pure water, and the dissociation pressure of CO 2 hydrate in sulfate solutions increases with an increasing salt concentration. Conversely, CuSO 4 barely affects the dissociation pressure of CO 2 hydrate, which is mainly attributed to the lower molar concentration of the ions compared with the other salt solutions and the ion specificity of Cu 2+ . The prediction results are in alignment with the experimental data measured in this study, which proves the feasibility of the thermodynamic model in predicting the dissociation pressure of CO 2 hydrate in sulfate solutions. Additionally, the calculated dissociation enthalpies of CO 2 hydrate show a dependence on both temperature and salt concentration. It is also revealed that Cu 2+ exhibits ion specificity in affecting the dissociation enthalpy of CO 2 hydrate, likely due to its more distinct ability to impact the cage occupancy of CO 2 hydrate than the other ions. These findings enhance our understanding of the impact of sulfate salts on the dissociation behavior of CO 2 hydrate and offer valuable insights for CO 2 sequestration.
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Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».