A model to predict phase equilibrium of CH4 and CO2 elathrate hydrate in aqueous electrolyte solutions
会议名称：《中国科学院地质与地球物理研究所2006学术年会》
会议日期：2007年
学科分类：070902[理学-地球化学] 0709[理学-地质学] 07[理学]
关 键 词：Methane hydrate carbon dioxide hydrate thermodynamic stability electrolyte solution phase equilibrium formation conditions
摘 要：A thermodynamic model to predict phase equilibrium of methane and carbon dioxide hydrate in aqueous electrolyte solutions is *** the Pitzer model to account for the variation of water activity due to electrolytes and dissolved gas in aqueous solutions,we extended the model based on ab initio molecular potential developed recently by us for the CH-HO and CO-HO binary systems to the CH(or CO-HO-salts *** of the model with extensive experimental data indicates that this model can accurately predict the phase equilibrium of CH hydrate and CO hydrate in various electrolyte solutions(such as aqueous NaCl,KCl, CaCl,NaCl + KCl,NaCl + CaCl solutions,and seawater) from zero to high ionic strength(about 6 m) and from low to high pressures.