Citation: SUN Shi-Cai, LIU Chang-Ling, YE Yu-Guang, JIANG Qian. Dissociation Conditions and Influencing Factors of Methane Hydrate in Chloride Salt Solution under High Pressure[J]. Acta Physico-Chimica Sinica, ;2011, 27(12): 2773-2778. doi: 10.3866/PKU.WHXB20112773 shu

Dissociation Conditions and Influencing Factors of Methane Hydrate in Chloride Salt Solution under High Pressure

SUN Shi-Cai ^1,2,3, ,
LIU Chang-Ling ^2,3 ,
YE Yu-Guang ^2,3 ,
JIANG Qian ¹

1.
1. Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation, College of Civil Engineering andArchitecture, Shandong University of Science and Technology, Qingdao 266510, Shandong Province, P. R. China;
2. The KeyLaboratory of Marine Hydrocarbon Resources and Environmental Geology, Ministry of Land and Resources, Qingdao 266071,Shandong Province, P. R. China;
3. Qingdao Institute of Marine Geology, Qingdao 266071, Shandong Province, P. R. China

Received Date: 28 July 2011
Available Online: 27 September 2011
Fund Project: 国土资源部公益性行业科研专项经费(201111026-3) (201111026-3) 国家重点基础研究发展规划(973) (2009CB219503) (973) (2009CB219503)山东省自然科学基金(ZR2009FQ017)资助项目 (ZR2009FQ017)

A method that can be used for gas hydrate exploitation is the injection of a brine solution into hydrate reservoir, therefore, the hydrate dissociation conditions and the influencing factors in brine solution should be investigated under reservoir pressure. In this paper, methane hydrate dissociation conditions in NaCl, MgCl₂, and CaCl₂ solutions were investigated. The results show that the dissociation temperature depressions are (4.8, 2.4, 1.0 K (NaCl)), (5.3, 1.5 K (MgCl₂)), (4.3, 1.8 K (CaCl₂)) in NaCl (2.0, 1.0, 0.5 mol· L^-1), MgCl₂ (1.0, 0.5 mol·L^-1), and CaCl₂ (1.0, 0.5 mol·L^-1) solutions, respectively, relative to those in pure water. The experimental values were in od agreement with the calculated values based on the van der Waals and Platteeuw thermodynamic model and the Pitzer-Mayorga equation for the water activity of electrolyte solution. In chloride salt solution the water molecule solvent effect and the salting-out effect that is caused by an electrostatic field decreases the water activity resulting in a depression of the hydrate dissociation temperature.
- Methane hydrate,
- Chloride salt solution,
- Dissociation condition,
- Salting-out effect,
- Water activity
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