Determination of clathrate hydrates dissociation conditions in aqueous solutions of methanol and salt using the e-NRTL based model

Forozan Keshavarzi, Jafar Javanmardi, Khashayar Nasrifar, Amir Mohammadi*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Saline water and organic inhibitors have considerable effects on preventing the formation of clathrate hydrates in gas and oil industries. The purpose of this study was to demonstrate a model that is capable of estimating the effects of NaCl, KCl, CaCl 2 and methanol aqueous solutions on the equilibrium disso- ciation conditions of pure and gas mixture hydrates in wide ranges of pressure and temperature. The e-NRTL activity coefficient model is employed to describe the non-ideally of the liquid/aqueous phase. The solid solution theory of van der Waals and Platteeuw is applied to characterize the hydrate phase. The gas phase is described by the Peng-Robinson (PR) equation of state. No adjusting or fitting param- eter is used. A comprehensive evaluation of the estimated values and literature data reveals the great accuracy of this model. To give a definite opinion, the obtained results of the proposed model were com- pared to experimental data and the results of four other thermodynamic models where the e-NRTL based model exhibits the least average absolute deviation ( AAD ). The average AAD of the e-NRTL based model results over 828 experimental data points was determined to be 0.59 K, which demonstrates an excellent agreement between the experimental data and the predicted/estimated values.
Original languageEnglish
Article number113121
JournalFluid Phase Equilibria
Publication statusPublished - 2021


  • Clathrate hydrate
  • Gas hydrate
  • Inhibitor
  • Methanol
  • Salt
  • e-NRTL model

ASJC Scopus subject areas

  • General Physics and Astronomy
  • General Chemical Engineering
  • Physical and Theoretical Chemistry

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