Abstract
The thermodynamic gas hydrate suppression behavior of four Deep Eutectic Solvents (DESs) was evaluated in this paper. The mixtures of Hydrogen Bond Acceptors (HBA), Tetraethylammonium Acetate (TEAAC), and Tetraethylammonium Bromide (TEAB) with Hydrogen Bond Donors (HBD), Mono-Ethylene Glycol (MEG), and Glycerol were used to make the DES. The DESs were made at a 1:7 molar ratio for the combinations of TEAAC:MEG, TEAAC:Glycerol, TEAB:MEG, and TEAB:Glycerol. The Hydrate Liquid-Vapor Equilibrium (HLVE) data for CO2 were evaluated through the T-cycle method at different temperature (273.15–283.15 K) and pressure (2–4 MPa) conditions in the presence and absence of 5 wt % aqueous DES solutions. The inhibition effects showed by the DESs, including average suppression temperature (ΔŦ) and gas hydrate dissociation enthalpies (ΔHdiss), were also calculated. The average suppression temperature values of the DESs ranged between 0.4 and 2.4, with the highest inhibition to lowest inhibition order being TEAB:Glycerol > TEAB:MEG > TEAAC:Glycerol > TEAAC:MEG. A comparison of the DES with conventional Thermodynamic Hydrate Inhibitors (THIs) showed that studied Deep Eutectic Solvents had better gas hydrate inhibition. The results proved that DES has the potential to be one of the promising alternatives in gas hydrate inhibition.
Highlights
Gas hydrates are stable inclusion compounds made up of a network of water molecule cages
Results of Tetraethylammonium Acetate (TEAAC):Mono-Ethylene Glycol (MEG), TEAAC:Glycerol, Tetraethylammonium Bromide (TEAB):MEG, and TEAB:Glycerol were compared to the FTIR of pure components TEAB, TEAAC, MEG, and Glycerol available on SpectraBase website provided by John Wiley and Sons, Inc. (Hoboken, NJ, USA)
It was agreed that as TEAB was superior to TEAAC and Glycerol was superior to MEG in inhibiting gas hydrate inhibition, the combination of the compounds showed similar nature to the pure compound
Summary
The Hydrate (HLVE) curves curves and average average suppression curves and average suppression temperature were obtained to understand the extent of thermodynamic suppression offered by the selected. 2 gas were considered temperature were to extent of thermodynamic offered by Selectedcompounds. Equilibrium curves and average suppression selected compounds. The dissociation dissociation enthalpies enthalpies (ΔH (ΔHdiss diss) for CO2 gas hydrate were considered selected. ) for CO2 gas hydrate were considered in this work. Temperature were obtained to understand the extent of thermodynamic suppression offered by the in this work. The dissociation enthalpies (∆Hdiss ) for CO2 gas hydrate were considered in Methodology
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