Effects of Halogen Ions on Phase Equilibrium of Methane Hydrate in Porous Media
Effects of Halogen Ions on Phase Equilibrium of Methane Hydrate in Porous Media
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DOI：
10.1007/s10765-012-1191-3
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发表时间：
2012-04
影响因子：
2.2
通讯作者：
Mingjun Yang;Yongchen Song;Yu Liu;W. Lam;Qingping Li;Xichong Yu
中科院分区：
文献类型：
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作者：
Mingjun Yang;Yongchen Song;Yu Liu;W. Lam;Qingping Li;Xichong Yu
采用正交试验法，在8 MPa压力下，研究了氟化钠、氯化钠、溴化钠和碘化钠中提取的卤素离子及其浓度对多孔介质中甲烷水合物相平衡条件的影响。实验结果表明，加入卤素离子后，甲烷水合物的平衡温度降低。平衡温度随卤素离子浓度的增加而降低。方差分析表明，卤素离子来源对甲烷水合物平衡温度的影响不敏感，这可以用氟化钠、氯化钠、溴化钠和碘化钠的平均离子活度系数（一个无量纲系数将活度与测量浓度联系起来）大致相同来解释。实验测量结果也与Song等人（J. Nat. Gas chem . 19,241(2010)）的热力学模型非常吻合，该模型考虑了水合物-液体-蒸汽系统中界面之间的力学平衡力。
The influences of halogen ions extracted from sodium fluoride, sodium chloride, sodium bromide, and sodium iodide and their concentrations on methane hydrate phase equilibrium conditions in porous media were investigated experimentally using an orthogonal test method at a pressure of 8 MPa. The experimental results showed that the equilibrium temperature of methane hydrate decreased when halogen ions were added. The equilibrium temperature decreased with the increase of halogen ion concentrations. The influence of the sources of the halogens ion to the methane hydrate equilibrium temperature were insensitive according to variance analysis, which could be explained by about the same mean ionic activity coefficient (a dimensionless coefficient relates the activity to a measured concentration) of sodium fluoride, sodium chloride, sodium bromide, and sodium iodide. The experimental measurements were also in close agreement with the thermodynamic model of Song et al. (J. Nat. Gas Chem.19, 241 (2010)), in which the mechanical equilibrium of force between the interfaces in a hydrate–liquid–vapor system was considered.