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Fu Q, Chen M, Pang W, Xu Z, Liu Z, Wen H, Lei X. Experimental and Modeling Study on Methane Hydrate Equilibrium Conditions in the Presence of Inorganic Salts. Molecules 2024; 29:3702. [PMID: 39125118 PMCID: PMC11313989 DOI: 10.3390/molecules29153702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2024] [Revised: 08/01/2024] [Accepted: 08/02/2024] [Indexed: 08/12/2024] Open
Abstract
The aim of this study was to determine the influence of four inorganic salts, KCl, NaCl, KBr and NaBr, on the thermodynamic conditions of methane hydrate formation. In order to achieve this, the vapor-liquid water-hydrate (VLWH) equilibrium conditions of methane (CH4) hydrate were measured in the temperature range of 274.15 K-282.15 K by the isothermal pressure search method. The results demonstrated that, in comparison with deionized water, the four inorganic salts exhibited a significant thermodynamic inhibition on CH4 hydrate. Furthermore, the inhibitory effect of Na+ on methane hydrate is more pronounced than that of K+, where there is no discernible difference between Cl- and Br-. The dissociation enthalpy (∆Hdiss) of CH4 hydrate in the four inorganic salt solutions is comparable to that of deionized water, indicating that the inorganic salt does not participate in the formation of hydrate crystals. The Chen-Guo hydrate model and N-NRTL-NRF activity model were employed to forecast the equilibrium conditions of CH4 hydrate in electrolyte solution. The absolute relative deviation (AARD) between the predicted and experimental values were 1.24%, 1.08%, 1.18% and 1.21%, respectively. The model demonstrated satisfactory universality and accuracy. This study presents a novel approach to elucidating the mechanism and model prediction of inorganic salt inhibition of hydrate.
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Affiliation(s)
- Qiang Fu
- State Key Laboratory of Offshore Natural Gas Hydrate, China National Offshore Oil Corporation, Beijing 100028, China; (Q.F.); (W.P.); (H.W.); (X.L.)
- Research Institute of China National Offshore Oil Cooperation, China National Offshore Oil Corporation, Beijing 100028, China
| | - Mingqiang Chen
- State Key Laboratory of Offshore Natural Gas Hydrate, China National Offshore Oil Corporation, Beijing 100028, China; (Q.F.); (W.P.); (H.W.); (X.L.)
- Research Institute of China National Offshore Oil Cooperation, China National Offshore Oil Corporation, Beijing 100028, China
| | - Weixin Pang
- State Key Laboratory of Offshore Natural Gas Hydrate, China National Offshore Oil Corporation, Beijing 100028, China; (Q.F.); (W.P.); (H.W.); (X.L.)
- Research Institute of China National Offshore Oil Cooperation, China National Offshore Oil Corporation, Beijing 100028, China
| | - Zhen Xu
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing at Karamay, Karamay 834000, China;
| | - Zengqi Liu
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing at Karamay, Karamay 834000, China;
| | - Huiyun Wen
- State Key Laboratory of Offshore Natural Gas Hydrate, China National Offshore Oil Corporation, Beijing 100028, China; (Q.F.); (W.P.); (H.W.); (X.L.)
- Research Institute of China National Offshore Oil Cooperation, China National Offshore Oil Corporation, Beijing 100028, China
| | - Xin Lei
- State Key Laboratory of Offshore Natural Gas Hydrate, China National Offshore Oil Corporation, Beijing 100028, China; (Q.F.); (W.P.); (H.W.); (X.L.)
- Research Institute of China National Offshore Oil Cooperation, China National Offshore Oil Corporation, Beijing 100028, China
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A potential strategy of carbon dioxide separation using supersonic flows. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.122153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Tang Y, Li Z, Wang G, He Y. A novel approach for nature gas hydrate separation: Downhole spiral-cyclone coupled hydraulic in-situ separation. Chem Eng Res Des 2022. [DOI: 10.1016/j.cherd.2022.10.034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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