Thermodynamic Modelling of Gas Hydrate Formation in the Presence of Inhibitors and the Consideration of their Effect

Peyman Sabzi; Saheb Noroozi

doi:10.22146/ajche.49715

Thermodynamic Modelling of Gas Hydrate Formation in the Presence of Inhibitors and the Consideration of their Effect

https://doi.org/10.22146/ajche.49715

Peyman Sabzi^(1*), Saheb Noroozi⁽²⁾

(1)
(2)
(*) Corresponding Author

Abstract

Gas hydrates formation is considered as one the greatest obstacles in gas transportation systems. Problems related to gas hydrate formation is more severe when dealing with transportation at low temperatures of deep water. In order to avoid formation of Gas hydrates, different inhibitors are used. Methanol is one of the most common and economically efficient inhibitor. Adding methanol to the flow lines, changes the thermodynamic equilibrium situation of the system. In order to predict these changes in thermodynamic behavior of the system, a series of modelings are performed using Matlab software in this paper. The main approach in this modeling is on the basis of Van der Waals and Plateau's thermodynamic approach. The obtained results of a system containing water, Methane and Methanol showed that hydrate formation pressure increases due to the increase of inhibitor amount in constant temperature and this increase is more in higher temperatures. Furthermore, these results were in harmony with the available empirical data.

Keywords: Gas hydrates, thermodynamic inhibitor, modelling, pipeline blockage

Keywords

Gas hydrates, thermodynamic inhibitor, modelling, pipeline blockage

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References

1. Cieslesicz, W. J. (1981). Hydrates of Natural Gas. Tulsa, Okla.: PenWell Books.
2. Englezos, P., & Bishnoi, P. (1988). Prediction of gas hydrate formation conditions in aqueous electrolyte solutions. AIChE journal, 34(10), 1718- 1721 .
3. Green, D. W., & Perry, R. H. (2007). Perry's chemical engineers' handbook (eighth ed.). New York: McGraw-Hill.
4. Mahmoodaghdam, E. (2001). Experimental and theoretical investigation of natural gas hydrates in the presence of methanol, ethylene glycol, diethylene glycol and triethylene glycol: University of Calgary.

5. Ng, H.-J., & Robinson, D. B. (1985). Hydrate formation in systems containing methane, ethane, propane, carbon dioxide or hydrogen sulfide in the presence of methanol. Fluid Phase Equilibria, 21(1), 145-155 .
6. Nguyen, T. H. (1986). The prediction of hydrate formation conditions for natural gas hydrates. (M.Sc.), Colorado School of Mines .
7. Nielsen, R. B., & Bucklin, R. W. (1983). Why not Use Methanol for Hydrate Control? Hydrocarbon Processing, 62(4), 71.
8. Parrish, W. R., & Prausnitz, J. M. (1972). Dissociation pressures of gas hydrates formed by gas mixtures. Industrial & Engineering Chemistry Process Design and Development, 11(1), 26-35 .

9. Pedersen, K. S., Christensen, P. L., & Azeem, S. J. (2006). Phase behavior of petroleum reservoir fluids. New York: CRC Press.
10. Platteeuw, J. C., & Van der Waals, J. H. (1959). Thermodynamic properties of gas hydrates II: Phase equilibria in the system H2S‐C3H3‐H2O AT− 3° C. Recueil des Travaux Chimiques des Pays-Bas, 78(2), 126-133 .
11. Poling, B. E., Prausnitz, J. M., & John Paul, O. C. (2004). The properties of gases and liquids (Fifth ed.). New York: McGraw-Hill.
12. Reid, R. C., Prausnitz, J. M., & Poling, B. E. (1987). The properties of gases and liquids (Fourth ed.). New York: McGraw-Hill.
13. Sloan, E. D. (1998). Clathrate hydrates of natural gases (2nd ed.). New York: Marcel Dekker.
14. Sloan, E. D., & Koh, C. A. (2007). Clathrate hydrates of natural gases (3rd ed.): CRC press.

DOI: https://doi.org/10.22146/ajche.49715