Chinese Journal of Applied Chemistry ›› 2016, Vol. 33 ›› Issue (3): 277-283.DOI: 10.11944/j.issn.1000-0518.2016.03.150213

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Research Development of Activity Coefficient Models in Hydrate Reaction Media

ZHANG Jin,ZHOU Shidong(),LU Guowei,YAN Hongyu,ZHAO Yongli   

  1. Jiangsu Key Laboratory of Oil and Gas Storage and Transportation Technology, Changzhou University,Changzhou,Jiangsu 213016,China
  • Received:2015-06-24 Accepted:2015-09-25 Published:2016-03-02 Online:2016-03-02
  • Contact: ZHOU Shidong
  • Supported by:
    Supported by the National Natural Science Foundation of China(51176015),Changzhou Industrial Support Project(CE20140055),Changzhou University College of Science and Technology Innovation Fund Projects (No201504A17)

Abstract:

Activity coefficient calculation is of great significance to the phase equilibrium of hydrate and the development of hydrate technology. Margules, Wilson, NRTL, UNIQUAC and UNIFAC models were studied by large amounts of survey with detailed analysis. The results show that Margules activity coefficient model is widely used in binary systems. Wilson activity coefficient model is not suitable for the system that solute and ion can not mix completely. The error of UNIQUAC in the calculation of aqueous or imidazole ion is bigger. We often choose NRTL for multiple ion systems. UNIFAC is widely used and can achieve precise calculation in high concentration solutions. Activity correlation equation parameters can be fit very well with high accuracy, but it is still difficult for systems of high temperature and pressure and needs to be developed in the future.

Key words: hydrate, activity coefficient model, additive, equilibrium