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›› 2010, Vol. 10 ›› Issue (3): 476-481.

• 反应与分离 • 上一篇    下一篇

盐水体系中环戊烷-甲烷水合物相平衡测定与模拟

闫忠元 陈朝阳 李小森 李清平 颜克凤   

  1. 中国科学院广州能源研究所，中国科学院可再生能源与天然气水合物重点实验室 中国科学院新疆理化技术研究所 中国科学院广州能源研究所 中海石油中国有限公司北京研究中心 中科院广州能源所天然气水合物中心
  • 收稿日期:2010-01-15 修回日期:2010-04-16 出版日期:2010-06-20 发布日期:2010-06-20
  • 通讯作者: 李小森

Phase Equilibrium Measurement and Prediction of Cyclopentane-Methane Hydrates in NaCl Aqueous Solution

YAN Zhong-yuan CHEN Zhao-yang LI Xiao-sen LI Qing-ping YAN Ke-feng   

  1. Key Laboratory of Renewable Energy and Gas Hydrate, CAS, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences Institute of Xinjiang Physics-chemistry Technical Guangzhou Research Center of Gas Hydrate, Guangzhou Institute of Energy Conversion, The Chinese Academy of Sciences Technology Research Department, CNOOC Research Centre Guangzhou Research Center of Gas Hydrate, Guangzhou Institute of Energy Conversion, The Chinese Academy of Sciences
  • Received:2010-01-15 Revised:2010-04-16 Online:2010-06-20 Published:2010-06-20
  • Contact: LI Xiao-sen

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被引次数

11

摘要： 利用恒温搜索法测定了温度284.4~303.8 K、NaCl质量浓度0~9.978%水溶液中环戊烷-甲烷水合物(II型)的相平衡条件. 结果表明，该体系水合物相平衡压力远低于纯甲烷水合物，且随温度升高和盐度增大逐渐升高. 在Van der Waals-Platteeuw等温吸附模型和Pitzer活度模型的基础上建立了环戊烷-甲烷水合物在盐水体系中的相平衡理论模型，模拟预测值与实验测定值的吻合度较好，平均相对误差为4.07%，能较好地预测盐水体系中环戊烷-甲烷水合物(II型)的相平衡条件.

关键词: 环戊烷-甲烷水合物, 相平衡, 模型, 盐水体系

Abstract: Isothermal pressure search method was used to measure the phase equilibrium conditions of cyclopentane (CP)-methane hydrates in the temperature range from 84.4 to 303.8 K and the NaCl mass concentration range from 0 to 10%. The results indicate that the equilibrium pressures of structure II hydrates of CP-methane are lower than that of methane hydrate. The phase equilibrium pressures of CP-methane hydrates increase with the increase of temperature, and increase linearly with the increase of NaCl concentration in solutions. Moreover, the effects of temperature and NaCl concentration are enlarged at a high temperature. A calculation and prediction model for equilibrium conditions of CP-methane (structure II) hydrates has been developed based on Van der Waals-Platteeuw isothermal adsorption theory and Pitzer activity coefficient model. The prediction results show that the model can depict the equilibrium conditions of CP-methane (structure II) hydrates well (average relative error at 4.07%).

Key words: cyclopentane-methane hydrate, phase equilibrium, model, brine system

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