期刊
JOURNAL OF CHEMICAL THERMODYNAMICS
卷 90, 期 -, 页码 116-121出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jct.2015.06.030
关键词
Methane hydrate; Phase equilibrium; Silica sand; Particle size; Chloride salt solution; Electrostatic force
资金
- National Natural Science Foundation of China [51376114]
- Natural Science Foundation of Shandong Province [ZR2014JL033]
- Open Foundation of the Key Laboratory of Gas Hydrate, Ministry of Land and Resources [SHW[2014]-ZD-02]
Hydrate equilibrium is the most important foundation for other hydrate issues, especially for marine environment condition. In this work, the silica sand containing NaCl/MgCl2/CaCl2 aqueous solution were used to simulate marine sediment for investigating methane hydrate equilibrium using isochoric multi-step heating dissociation method. All measurements were performed in a temperature and pressure range of (279.5 to 289.7) K and (8.32 to 17.52) MPa, respectively. The results suggest that the equilibrium of methane hydrate in fine-grained silica sand containing chloride salt solution shifts more greatly to the left relative to that in single silica sand or solution. This is because water molecules reduce more chances to combine with gas molecules that is caused by the capillary force and the electrostatic attractions from the surface and electrolyte ions. However, hydrate equilibrium in coarse-grained silica sand containing chloride salt solution is in rough agreement with that in ionic solution of the corresponding concentration that indicates that hydrate equilibrium is mainly influenced by ions while the impact of solid particles is negligible. (C) 2015 Elsevier Ltd. All rights reserved.
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