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Although some thermodynamic models for hydrate equilibrium conditions in the single porous media or in-hibitor solution have been reported, there are limited studies for those in the (porous media + inhibitor solution) complex systems. In this work, the CH4, CO2, C2H6, C3H8 and (CH4+C3H8) hydrate phase equilibrium data in the (porous media + NaCl or MeOH solution) systems was first examined by the thermodynamic consistency assessment. Then two thermodynamic models were proposed to predict their hydrate equilibrium conditions, which are established based on the Chen-Guo (C-G) model and Hu-Lee-Sum (HLS) correction. In the first model (Model 1), the changes of water molar volume and the effect of temperature on interfacial tension was considered. While the water activity was deemed to be independent of temperature in the second model (Model 2). The predictions agreed well with literature data, the overall AADP of 165 data sets for Model 1 and Model 2 was less than 6.01% and 4.56%, respectively, and the prediction accuracy was improved compared with other models. Results showed that Model 2 had good performance in both the (porous media + NaCl solution) systems and the (porous media + MeOH solution) systems. For the predictions of Model 1 in the (porous media + NaCl solution) systems, the average absolute deviation percent in pressure (AADP) increased as the increase of NaCl concentration, while no obvious variation trend was observed in the prediction of Model 2.
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FLUID PHASE EQUILIBRIA
ISSN: 0378-3812
Year: 2023
Volume: 568
2 . 8
JCR@2023
2 . 8 0 0
JCR@2023
ESI Discipline: CHEMISTRY;
ESI HC Threshold:39
JCR Journal Grade:2
CAS Journal Grade:3
Cited Count:
WoS CC Cited Count: 1
SCOPUS Cited Count: 2
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 0
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