Dissociation behavior of (CH_4+C_2H_4) hydrate in the presence of sodium dodecyl sulfate

作     者：Peng Baozi Sun Changyu Chen Guangjin Tang Xulong Liu Peng Chen Jun Zhang Yanqin Peng Baozi1,Sun Changyu1,Chen Guangjin1,Tang Xulong2,Liu Peng2,Chen Jun2 and Zhang Yanqin2 1 State Key Laboratory of Heavy Oil Processing,China University of Petroleum,Beijing 102249,China 2 High Pressure Fluid Phase Behavior & Property Research Laboratory,China University of Petroleum,Beijing 102249,China

作者机构：State Key Laboratory of Heavy Oil Processing China University of Petroleum Beijing 102249 China High Pressure Fluid Phase Behavior ＆ Property Research Laboratory China University of Petroleum Beijing 102249 China 

出 版 物：《Petroleum Science》 (石油科学（英文版）)

年 卷 期：2010年第7卷第1期

页      面：112-117页

核心收录：

学科分类：081702[工学-化学工艺] 081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

基　　金：support received from the National Nature Science Foundation of China (Nos. 20676145, U0633003) the National Basic Research Program of China (973 program) (No. 2009CB219504) the Hi-Tech Research and Development Program of China (863 Program) New Century Excellent Talents in University (NCET) National Science and Technology Major Projects (2008ZX05026) Foundation for the Authors of National Excellent Doctoral Dissertation of the People's Republic of China (No. 200447) 

主　　题：Methane ethylene hydrate dissociation SDS 

摘      要：Separation of a mixture of CH4＋C2H4 gas by forming hydrate in ethylene production has become of interest, and the dissociation behavior of （CH4＋C2H4） hydrate is of great importance for this process. The hydrate formation rate could be increased by adding a small amount of sodium dodecyl sulfate （SDS） into water. In this work, the kinetic data of CH4（18.5 mol%）＋C2H4（81.5 tool%） hydrate decomposition in the presence of 1000 mg.L-~ SDS at different temperatures and pressures were measured with the depressurizing method using a sapphire cell apparatus. The experimental results show that the dissociation rate of （CH4＋C2H4） mixed gas hydrate was large at high temperature and low pressure, and temperature had great influence on the dissociation rate at high pressure. A kinetic model for hydrate dissociation was proposed and the calculated results from the kinetic model were in good agreement with the experimental data. The activation energy for dissociation of the （CH4＋C2H4） mixed gas hydrate was determined to be 43.9 kJ-mol-~, which is lower than that of methane （81.0 ***-~） and ethane （104.0 kJ＇mol-~） hydrate in water （Clarke and Bishnoi, 2004）. As the similar molecular dimensions between ethane and ethylene, the close activation energy need to be provided for ethylene hydrate dissociation. The obtained activation energy of the （CH4＋C2H4） mixed gas hydrate dissociation indicates that the dissociation of the （CH4＋C2H4） mixed gas hydrate is easier than that of pure CH4 or C2H4 gas hydrate.