关键词: 分离, 水合物, 热力学, 动力学模型, 二元混合物

Abstract: In this work, a review of the hydrate based separation technology for CH₄/CO₂ mixture was proposed. Firstly, the available promotion approaches including thermodynamic promotions,kinetic promotions and integrated promotions were summarized. The thermodynamic promotion could affect the phase equilibria of gas hydrate, while it would decrease the separation factor of CO₂. The hydration reaction rate would be increased with kinetic promotor, but the phase equilibrium data would be invariable. The main research aspect in future, integrated promotion with the advantages of thermodynamic promotion and kinetic promotion, was still on the first stage. Secondly, the thermodynamic models and the kinetic models for the process were discussed. The available thermodynamic models were main proposed for the systems without promotors, and they were always utilized to predict phase equilibrium data or constitute of all phases. The model would predict both of them with high accuracy was still absent. The kinetic models were mainly developed for the process of hydrate growth. Additionally, the kinetic of the nucleation process could not be performed with kinetic model. Then the current situation of the process analysis, mainly focusing on the experimental analysis and the calculation for the phase equilibria situation with model, was presented. Last but not least, the main research aspects in future were also suggested.

Key words: separation, gas hydrate, thermodynamic, kinetical model, binary mixture