Thermodynamic effect of ammonium based ionic liquids on CO 2 hydrates phase boundary

Khan, Muhammad Saad; Bavoh, Cornelius B.; Partoon, Behzad; Bustam, Mohamad Azmi; Shariff, Azmi Mohd

doi:10.1016/j.molliq.2017.05.045

Cited by 121 publications

(66 citation statements)

References 38 publications

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“…A high-pressure stainless steel cell [3,12,32] with an internal volume of 650 mL, alongside a maximum working pressure of 30 MPa, is used in this study. The cell is immersed in a water bath to regulate the temperature in the cell at desired conditions during experimentations.…”

Section: Details Of Experimental Equipmentmentioning

confidence: 99%

“…TMAOH is speculated to demonstrate a kinetic inhibitory mechanisms effect via (1) coulombic forces of interactions and (2) hydrogen bonding affinity, which probably results in its kinetic hydrate inhibition influence. Firstly, TMAOH is an ionic liquid which can form hydrogen bonding with water molecules and thus disturb the hydrogen-bonded structure of water molecules owing to the presence of its anion and cation ions [4,12,15,48]. TMAOH ionizes in aqueous solution as TMA + cation and OH − anions which interacts with the dipoles of the aqueous molecules with strong coulombic forces in additions to its hydrogen bonding ability [49].…”

Section: Kinetic Mechanism Of Tmaohmentioning

confidence: 99%

“…Therefore, in-depth understanding of the mix gas hydrate systems will primarily provide an avenue for safe flow assurance operations when transporting such natural gas systems. Also, this will also provide some fundamental knowledge to design CO 2 separation system for the natural gas system together with the storage opportunity for CO 2 captured from richer CO 2 content natural gas [4,11,12].…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, a limited number of studies are found on the effect of ammonium-based ionic liquids (AILs) as gas hydrate inhibitors [4,12,[31][32][33]. Few studies have reported that AILs could efficiently induce thermodynamic hydrate inhibition [3,4,14,34]; however, kinetic evaluations of AILs are rarely available in open literature [15].…”

Section: Introductionmentioning

confidence: 99%

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Kinetic Assessment of Tetramethyl Ammonium Hydroxide (Ionic Liquid) for Carbon Dioxide, Methane and Binary Mix Gas Hydrates

Khan¹,

Cornelius²,

Lal³

et al. 2018

Recent Advances in Ionic Liquids

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This present work highlights the impact of ammonium-based ionic liquid tetramethylammonium hydroxide (TMAOH) on the formation kinetics of carbon dioxide (CO 2), methane (CH 4), and their binary mixed gas (50-50 mole%) hydrates. The TMAOH (IL) is applied in varying concentrations (0.5, 1, and 2 wt%) at different experimental temperatures, i.e., 1 and 4°C. The kinetic experiments are conducted in a high-pressure reactor equipped with two-bladed impeller, to provide sufficient agitation. The experimental pressures of CO 2 , CH 4 , and mixed 50% CO 2 + 50% CH 4 were 3.50, 8.0, and 6.50 MPa, respectively. Induction time, the initial apparent rate of formation and the total gas consumed are the kinetic parameters used to evaluate the performance of TMAOH as KHI. The results are further compared with commercial KHI (PVP), at higher subcooling condition of 1°C and 1 wt% of all the studied gaseous systems. Furthermore, the KHI performance of TMAOH is also evaluated via the relative inhibition performance (RIP) compared with other ILs for CO 2 and CH 4 hydrates. Results revealed that TMAOH delays the induction time for all the considered systems. The presence of TMAOH also reduced the total gas consumed and the initial rate of hydrate formation in most of the studied systems.

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Section: Details Of Experimental Equipmentmentioning

confidence: 99%

Section: Kinetic Mechanism Of Tmaohmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Kinetic Assessment of Tetramethyl Ammonium Hydroxide (Ionic Liquid) for Carbon Dioxide, Methane and Binary Mix Gas Hydrates

Khan¹,

Cornelius²,

Lal³

et al. 2018

Recent Advances in Ionic Liquids

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show abstract

“…In recent decades, hydrates have received plenty of attention, because of its potential to capture and store gas [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. Also, it is discovered that gas hydrates located in subsea as well as permafrost region are a potential source of energy too [15].…”

Section: Introductionmentioning

confidence: 99%

Pre-Screening of Ionic Liquids as Gas Hydrate Inhibitor via Application of COSMO-RS for Methane Hydrate

Khan¹,

Lal²

2020

Solvents, Ionic Liquids and Solvent Effects

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Ionic liquids (ILs) due to their potential dual functionality to shift hydrate equilibrium curve and retard hydrate nucleation are considered as a very promising gas hydrate inhibitor. However, experimental testing alone is insufficient to examine all potential ILs combinations due to a high number of cation and anion to form ILs. In this context, four fundamental properties of IL-hydrate system, namely, sigma profile, hydrogen bonding energies, activity coefficient, and solubility, were stimulated through conductor-like screening model for real solvent (COSMO-RS). ILs were then analyzed to determine if they can be correlated with IL inhibition ability. Among them, sigma profile and hydrogen bonding energies, which later upgraded to total interaction energies, exhibit a significant relationship with IL inhibition ability. Total interaction energies of ions, on the other hand, have successfully been applied to develop a model. The model can predict the thermodynamic inhibition ability in terms of average temperature depression. The correlation was further validated with experimental values from literature with an average error of 20.49%. Finally, using sigma profile graph and developed correlation, the inhibition ability of 20 ammonium-based ILs (AILs) have been predicted. Tetramethylammonium hydroxide (TMA-OH), due to its short alkyl chain length cation and highly electronegative anion, has shown the most promising inhibition ability among the considered system.

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Experimental and simulation studies on the phase behaviour for gas hydrates in a CO₂ rich gas dominant multiphase pipeline system

Sayani

Lal

et al. 2022

Can J Chem Eng

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In this work, an experimental and modelling study is performed to identify the phase behaviour of gas hydrates formation for a high CO2 content natural gas system and multiphase gas dominant system. Further, CSMGem, PVTSim, and Aspen HYSYS software packages are used to verify the prediction capabilities for gas hydrates formation conditions. Initially, thermodynamic equilibrium conditions are obtained using CSMGem, PVTSim, and Aspen HYSYS. Then, these results are validated and compared to the experimental work to verify the accuracy in predicting hydrate formation conditions. An experimental study is performed in the pressure range of 2–7 MPa for a pure system and multiphase system with the gas composition of carbon dioxide (70%) + methane (26%) + ethane (2%) + propane (1%) + butane (1%). The results show that the PVTSim software package shows the best accuracy with 99.9% for the pure system and 99.88% for the multiphase system.

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Thermodynamic effect of ammonium based ionic liquids on CO 2 hydrates phase boundary

Cited by 121 publications

References 38 publications

Kinetic Assessment of Tetramethyl Ammonium Hydroxide (Ionic Liquid) for Carbon Dioxide, Methane and Binary Mix Gas Hydrates

Kinetic Assessment of Tetramethyl Ammonium Hydroxide (Ionic Liquid) for Carbon Dioxide, Methane and Binary Mix Gas Hydrates

Pre-Screening of Ionic Liquids as Gas Hydrate Inhibitor via Application of COSMO-RS for Methane Hydrate

Experimental and simulation studies on the phase behaviour for gas hydrates in a CO₂ rich gas dominant multiphase pipeline system

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Thermodynamic effect of ammonium based ionic liquids on CO 2 hydrates phase boundary

Cited by 121 publications

References 38 publications

Kinetic Assessment of Tetramethyl Ammonium Hydroxide (Ionic Liquid) for Carbon Dioxide, Methane and Binary Mix Gas Hydrates

Kinetic Assessment of Tetramethyl Ammonium Hydroxide (Ionic Liquid) for Carbon Dioxide, Methane and Binary Mix Gas Hydrates

Pre-Screening of Ionic Liquids as Gas Hydrate Inhibitor via Application of COSMO-RS for Methane Hydrate

Experimental and simulation studies on the phase behaviour for gas hydrates in a CO2 rich gas dominant multiphase pipeline system

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Product

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Experimental and simulation studies on the phase behaviour for gas hydrates in a CO₂ rich gas dominant multiphase pipeline system