Experimental and modeling studies on enhancing the thermodynamic hydrate inhibition performance of monoethylene glycol via synergistic green material

Abstract

This paper presents an experimental and modeling studies on the thermodynamic inhibition effects of the mixture of monoethlyene glycol (MEG) and glycine (Gly) on the carbon dioxide hydrate phase boundary condition. The monoethlyene glycol and glycine (1:1) mixture inhibition effects were investigated at concentrations of 5, 10, and 15 wt.% and pressure ranges from 2.0–4.0 MPa. The effects of the proposed mixture on the carbon dioxide hydrate phase boundary were evaluated by measuring the dissociation temperature of carbon dioxide hydrate using a T-cycle method. The synergistic effect was evaluated based on comparison with pure MEG and Gly data. The results show that 15 wt.% of MEG and Gly mixture displays the highest inhibition effect compared to the 5 and 10 wt.% mixtures, respectively. However, the synergistic effect is higher at 10 wt.%. Dickens' model was also adopted to predict the phase equilibrium data of CO2 hydrates in the presence of the mixture. The modified model successfully predicted the data within a maximum error of ± 0.52 K.

Inhibition Effect of Synthesized Ionic Liquids on Hydrate Formation: A Kinetic and Thermodynamic Study

“…However, from Figure , a sudden decrease in enthalpy compared to pure water can be seen with the addition and increase in the concentration of ILs compared to pure water. Thus, it can be said that pure water needs more energy to break the hydrogen bonds compared to C12 IL with varying concentrations; thus, C12 IL is highly recommended to consider in the gas industry …”

“…Thus, it can be said that pure water needs more energy to break the hydrogen bonds compared to C12 IL with varying concentrations; thus, C12 IL is highly recommended to consider in the gas industry. 38 3.8. Water to Hydrate and Gas to Hydrate Conversion.…”

Experimental Study of the Effect of the Combined Monoethylene Glycol with NaCl/CaCl2 Salts on Sour Gas Hydrate Inhibition with Low-Concentration Hydrogen Sulfide

“…The thermodynamic inhibition mechanism of monoethylene glycol is such that it forms hydrogen bonds with water molecules by its hydroxyl group and prevents the formation of hydrate masses. 5,26 It should be noted that the inhibition power of the ethylene glycol in presence of salts increased significantly. It is beneficial to mention that the salt ionizes to cation and anion in solution and by interacting with water's dipoles through strong electrostatic force reduces the activity of water in the liquid phase and creates thermodynamic inhibitory properties, causing hydrate formation in more difficult conditions.…”

Methane and Carbon Dioxide Hydrate Formation in the Presence of Metal-Based Fluid

“…Clathrate hydrates (gas hydrates) are crystalline inclusion compounds where a small guest molecule is encapsulated inside water cavities under appropriate thermodynamic conditions [ 1 ]. Gas hydrates have been renowned as a severe issue for the oil and gas industry due to the blockage caused by hydrate formation in the pipelines [ 2 ]. However, gas hydrates have shown a bright side for several gas applications such as separation, transportation, and storage [ 3 , 4 , 5 ].…”