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Applicability Research of Thermodynamic Models of Gas Hydrate Phase Equilibrium Base on Different Equations of State
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  • Geng Zhang,
  • Jun Li,
  • Gong Liu,
  • Hong Yang,
  • Hong Huang,
  • Wang Chen
Geng Zhang
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Jun Li

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Hong Huang
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Abstract

This study is based on statistical thermodynamics, considering the changes in water activity caused by gas dissolution, and deriving and summarizing four thermodynamic models. Based on the collected 150 experimental data points, the accuracy of the four thermodynamic models in predicting the phase equilibrium of methane, carbon dioxide, and ethane hydrate was compared and analyzed. The analysis results show that in the temperature range of 273.40K~290.15K, the Chen-Guo model is better than other thermodynamic models in predicting the phase equilibrium temperature of methane hydrate by using the Patel-Teja equation of state. In the temperature range of 273.36~283.3K, the John-Holder model uses the Peng-Robinson state to predict the phase equilibrium of carbon dioxide hydrate with the highest accuracy. In the temperature range of 273.68K to 287.6K, the Chen-Guo model is selected to predict the formation conditions of ethane hydrate with the highest accuracy.