Inhibitory influence of amino acids on the formation kinetics of methane hydrates in oil-water and oil-brine systems

Almashwali, Abdulrab Abdulwahab; Khan, Muhammad Saad; Lal, Bhajan; Jin, Quah Chong; Sabil, Khalik M.; Khor, Siak Foo

doi:10.1016/j.chemosphere.2022.137325

Cited by 5 publications

(5 citation statements)

References 55 publications

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“…(A) High-pressure cell reactor used in this study. (B) Schematic diagram of the high-pressure reactor . Copyright [2022] [ELSEVIER].…”

Section: Methodsmentioning

confidence: 99%

“…PETRONAS Sdn Bhd provided the drilling oil used during this study with a purity of 99.0%; further explanation on the composition of the drilling oil has been reported in our previous study. 11 The experiment was conducted on methane gas with a purity of 99.9%, purchased from LMG-UTP, Malaysia. Deionized water was used in preparing all solutions with a water cut of 50%.…”

Section: Methodsmentioning

confidence: 99%

“… Temperature vs pressure plot indicating the hydrate formation using a high pressure reactor cell. 11 Copyright [2022] [ELSEVIER]. …”

Section: Methodsmentioning

confidence: 99%

“…One promising method for inhibiting gas hydrate formation is using NaCl as a kinetic and thermodynamic inhibitor. Brine is a solution of water and dissolved salts, and it has been found to effectively inhibit gas hydrate formation in laboratory experiments . NaCl inhibits gas hydrate formation by reducing the concentration of hydrate-forming molecules in the water phase and disrupting the growth and stability of gas hydrates by altering the interfacial properties of the hydrate–water interface.…”

Section: Introductionmentioning

confidence: 99%

“…Brine is a solution of water and dissolved salts, and it has been found to effectively inhibit gas hydrate formation in laboratory experiments. 11 NaCl inhibits gas hydrate formation by reducing the concentration of hydrate-forming molecules in the water phase and disrupting the growth and stability of gas hydrates by altering the interfacial properties of the hydrate–water interface. The use of NaCl as a gas hydrate inhibitor is attractive due to its low cost, nontoxicity, and sustainability.…”

Section: Introductionmentioning

confidence: 99%

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Kinetic and Thermodynamic Influence of NaCl on Methane Hydrate in an Oil-Dominated System

Almashwali,

Idress,

Lal

et al. 2023

ACS Omega

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This experimental study reports the kinetic and thermodynamic inhibition influence of sodium chloride (NaCl) on methane (CH4) hydrate in an oil-dominated system. To thoroughly examine the inhibition effect of NaCl on CH4 hydrate formation, kinetically by the induction time and relative inhibition performance and thermodynamically by the hydrate liquid–vapor equilibrium (HLwVE) curve, enthalpy (ΔH diss) and suppression temperature are used to measure the NaCl inhibition performance through this experimental study. All kinetic experiments are performed at a concentration of 1 wt % under a pressure and temperature of 8 MPa and 274.15K, respectively, whereby for the thermodynamic study, the concentration was 3 wt % by using the isochoric T-cycle technique at the selected range of pressures and temperatures of 4.0–9.0 MPa and 276.5–286.0K, respectively; both studies were conducted using a high-pressure reactor cell. Results show that kinetically, NaCl offers slightly to no inhibition in both systems with/without oil; however, the presence of drilling oil contributes positively by increasing the induction time; thermodynamically, NaCl contributes significantly in shifting the equilibrium curve to higher pressures and lower temperatures in both systems. In the oil system, the contribution of the THI to the equilibrium curve increases the pressure with a range of 0.04–0.15 MPa and reduces the temperature with a range of 1–3 K, which is due to the NaCl presence in the systems that reduces the activity of water molecules by increasing the ionic strength of the solution. At a high pressure of 9 MPa, the NaCl inhibition performance was greater than that at lower pressures <5.5 MPa because, at the high pressure, NaCl increases the activity of water, which means that more water molecules are available to form hydrate cages around gas molecules.

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“…(A) High-pressure cell reactor used in this study. (B) Schematic diagram of the high-pressure reactor . Copyright [2022] [ELSEVIER].…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“… Temperature vs pressure plot indicating the hydrate formation using a high pressure reactor cell. 11 Copyright [2022] [ELSEVIER]. …”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Kinetic and Thermodynamic Influence of NaCl on Methane Hydrate in an Oil-Dominated System

Almashwali,

Idress,

Lal

et al. 2023

ACS Omega

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Evaluation of the synergic effect of amino acids for CO2 hydrate formation and dissociation

Almashwali,

Kong Jee,

Lal

2024

Gas Science and Engineering

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Methane Hydrate-in-Oil Systems in the Presence of Natural Amino Acid-Equilibrium Phase Condition Measurements

Almashwali,

Lal,

Khor

2024

ACS Omega

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This experimental study reports the thermodynamic influence of three different amino acids on methane hydrate in oildominated systems, namely, glycine, proline, and alanine. To thoroughly examine the effect of selected amino acids on methane (CH 4 ) hydrate formation compared to the commercial inhibitor monoethylene glycol (MEG) in the presence of oil, the hydrate liquid−vapor equilibrium (H-Lw-Lo-V) curve is used to measure amino acid aqueous solutions. All experiments are performed at a concentration of 10 wt % by using the isochoric T-cycle technique in a high-pressure reactor cell at the selected range of pressures with temperatures of 4.0−9.0 MPa and 276.5−286.0 K, respectively. Results show that all studied amino acids inhibit hydrate formation of methane; the inhibition trend shows as glycine > alanine > proline in both systems; in the brine water system, the inhibition performance was higher than in the pure water system due to the presence of NaCl. Glycine showed the highest inhibition strength in both systems with an average reduced temperature in pure and brine water of 0.92 and 1.75 K, respectively, at 10 wt %, making the inhibition performance of glycine comparable to the commercial inhibitor MEG. The inhibition effect is attributed to the amino acid's hydrogen bonding energies and side group alkyl chain. Calculating the dissociation enthalpies of methane hydrates in the presence of amino acids using the Clausius−Clapeyron equation implies that the amino acids do not occupy the cage structures during methane hydrate formation.

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Inhibitory influence of amino acids on the formation kinetics of methane hydrates in oil-water and oil-brine systems

Cited by 5 publications

References 55 publications

Kinetic and Thermodynamic Influence of NaCl on Methane Hydrate in an Oil-Dominated System

Kinetic and Thermodynamic Influence of NaCl on Methane Hydrate in an Oil-Dominated System

Evaluation of the synergic effect of amino acids for CO2 hydrate formation and dissociation

Methane Hydrate-in-Oil Systems in the Presence of Natural Amino Acid-Equilibrium Phase Condition Measurements

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