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A 3-In-1 Approach to Evaluate Gas Hydrate Inhibitors

Author

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  • Narendra Kumar

    (Department of Chemistry and Chemical Engineering, Royal Military College of Canada, 3 General Crerar Crescent, Kingston, ON K7K 7B4, Canada)

  • Niaz Bahar Chowdhury

    (Department of Chemistry and Chemical Engineering, Royal Military College of Canada, 3 General Crerar Crescent, Kingston, ON K7K 7B4, Canada)

  • Juan G. Beltran

    (Department of Chemistry and Chemical Engineering, Royal Military College of Canada, 3 General Crerar Crescent, Kingston, ON K7K 7B4, Canada)

Abstract

With a single apparatus and very short experimentation times, we have assessed phase equilibria, apparent kinetics and morphology of methane gas hydrates in the presence of thermodynamic inhibitors ethane-1,2-diol (MEG) and sodium chloride (NaCl); and kinetic hydrate inhibitor polyvinyl-pyrrolidone (PVP). Tight, local temperature control produced highly repeatable crystal morphologies in constant temperature systems and in systems subject to fixed temperature gradients. Hydrate-Liquid-Vapor (HLV) equilibrium points were obtained with minimal temperature and pressure uncertainties ( u T avg = 0.13 K and u p = 0.005 MPa). By applying a temperature gradient during hydrate formation, it was possible to study multiple subcoolings with a single experiment. Hydrate growth velocities were determined both under temperature gradients and under constant temperature growth. It was found that both NaCl and MEG act as kinetic inhibitors at the studied concentrations. Finally, insights on the mechanism of action of classical inhibitors are presented.

Suggested Citation

  • Narendra Kumar & Niaz Bahar Chowdhury & Juan G. Beltran, 2019. "A 3-In-1 Approach to Evaluate Gas Hydrate Inhibitors," Energies, MDPI, vol. 12(15), pages 1-17, July.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:15:p:2921-:d:252802
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    References listed on IDEAS

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    1. E. Dendy Sloan, 2003. "Fundamental principles and applications of natural gas hydrates," Nature, Nature, vol. 426(6964), pages 353-359, November.
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