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《科学通报(英文版)》 2003-01
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Equilibrium PT curve of methane hydrates in the presence of AlCl_3

LEI Huaiyan1,2,3, ZHENG Yanhong1 & WU Baoxiang1 1. State Key Laboratory of Gas Geochemistry, Lanzhou Institute of Geology, Chinese Academy of Sciences, Lanzhou 730000, China; 2. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510070, China; 3. College of Oceanography and Environmental Science, Xiamen Uni-versity, Xiamen 361005, China Correspondence should be addressed to Lei Huaiyan (e-mail: hyanlei@ ns.lzb.ac.cn)  
Using an experimental transparent sapphire high-pressure cell, three-phase (methane hydrate + AlCl3 solution + methane) equilibrium conditions of methane hy-drates in the aqueous solution containing AlCl3 have been investigated under conditions of temperature from 272.15 to 278.15 K and pressure from 4.040 to 8.382 MPa. It could be clearly verified that AlCl3 is of stronger inhibitive effect than that observed for other electrolytes, such as KCl, CaCl2, at the same mole fraction. The induction time of the methane hydrate formation becomes longer when the water activity decreases with the increase of ion charge numbers. Methane hydrates tend to crystallize more easily with higher concen-tration (AlCl3 concentration of 18%) than lower one (AlCl3 concentration of 10%) in the same electriclyte solution. An empirical exponential equation is presented to calculate the equilibrium temperature and pressure of methane hydrate stable occurrence, and to correlate the measured data for aqueous AlCl3 solution. The results show that there was infi-nitely small discrepancy between the theoretical computed values and the data oberserved in actual experiments.
【Fund】: This work was supported by the National Natural Science Fundation of China (Grant Nos. 49973024 and 40272066);; and the Fundation of State Key Laboratory of Gas and Geochemistry (Grant No. SJJ-01-02).
【CateGory Index】: P618.13
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