Phase equilibrium measurement and modeling approach to quaternary ammonium salts with and without monoethylene glycol for carbon dioxide hydrates

Qasim, Ali; Khan, Muhammad Saad; Lal, Bhajan; Shariff, Azmi Mohammad

doi:10.1016/j.molliq.2019.02.115

Cited by 57 publications

(65 citation statements)

References 66 publications

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“…[58]. In researches conducted by [58,59] using different types of gases, they demonstrate that as the molecular weight of the IL reduces, the average suppression temperature, ∆T increases. The average suppression temperature when inhibitor is tested with CO 2 gas is better compared to CH 4 gas since it gives a slightly higher value, as shown in Figure 4.…”

Section: Quaternary Ammonium Saltsmentioning

confidence: 99%

“…In evaluating the performance of QAS for gas hydrate inhibition, several methods has been applied, such as the T-cycle method and using highpressure micro differential scanning calorimetry equipment. The Isochoric constant cooling method or T-cycle method is one of the most used method, carried out by [37,[56][57][58][59][60][61][62] with different type of gases to study on the kinetic inhibition of the selected compounds. In this method, 100 mL of liquid sample is poured into the cell which is then vacuumed thoroughly to remove excess air that may still exist in the cell [20,63].…”

Section: Quaternary Ammonium Saltsmentioning

confidence: 99%

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Review on Application of Quaternary Ammonium Salts for Gas Hydrate Inhibition

Hussain

Husin

2020

Applied Sciences

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Gas hydrate solids occurrence is considered as one of the serious challenges in flow assurance as it affects the hydrocarbon production significantly, especially in deep water gas fields. The most cost-effective method to inhibit the formation of hydrate in pipelines is by injecting a hydrate inhibitor agent. Continuous studies have led to a comprehensive understanding on the use of low dosage hydrate inhibitors such as ionic liquid and quaternary ammonium salts which are also known as dual function gas hydrate inhibitors. This paper covers the latest types of quaternary ammonium salts (2020–2016) and a summary of findings which are essential for future studies. Reviews on the effects of length of ionic liquids alkyl chain, average suppression temperatures, hydrate dissociation enthalpies, and electrical conductivity to the effectiveness of the quaternary ammonium salts as gas hydrate inhibitors are included.

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Section: Quaternary Ammonium Saltsmentioning

confidence: 99%

Section: Quaternary Ammonium Saltsmentioning

confidence: 99%

Review on Application of Quaternary Ammonium Salts for Gas Hydrate Inhibition

Hussain

Husin

2020

Applied Sciences

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“…However, since IL-hydrate equilibrium curve is not quantifiable and thus is not possible to develop correlation, average temperature depression will be used to represent IL inhibition ability in our work. This average temperature depression value can be calculated through the following equation [9,13,30]:…”

Section: Extracting Experimental Il Inhibition Abilitymentioning

confidence: 99%

“…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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“…In subsea pipelines, flow assurance risk management is an important factor that needs to be taken into consideration due to the formation of gas hydrates, corrosion, scaling and wax [1]- [6]. Among these dangers, the formation of gas hydrates is of the major concerns that cost millions of dollars per annum in mitigation [3], [7], [8].…”

Section: Introductionmentioning

confidence: 99%

Simulation of Hydrate Phase Boundary for Natural Gas Mixture with High CO2Content through Simulation

Qasim,

Khan,

Lal

et al. 2019

IJEAT

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Gas hydrates are solid crystalline structures in which water molecules trap small guest gas molecules and encage them through hydrogen bonding. Gas hydrates are known to be problematic in flow assurance applications as they can form plug inside the pipelines during oil and gas production, transportation and processing. In order to inhibit hydrate formation thermodynamically, various chemicals including some alcohols e.g. methanol (MeOH), mono- ethylene glycol (MEG) are used as thermodynamic hydrate inhibitors (THIs). In this paper, a simulation study is performed using PVTsim software wherein it predicts the hydrate formation for pure CO2 solution mixture and CO2 -MEG solution mixture systems using different equation of states. These equations of states include Soave-Redlich-Kwong (SRK), SRK-Peneloux, Peng- Robinson (PR) and Peng-Robinson Peneloux. The simulation results obtained using these equation of states were validated with the experimental data and PRPenelouxEoS was found to be in better agreement. The hydrate formation regions are determined in between the pressure range of 10 to 110 bara for natural gas mixture containing high percentage of CO2 in it. The inhibitors are used in 5, 10 and 20 wt% concentrations. The hydrate inhibition efficiency increased with the increase in concentration. Simulation results showed that methanol performed better in comparison to the other inhibitors at all concentrations.

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Phase equilibrium measurement and modeling approach to quaternary ammonium salts with and without monoethylene glycol for carbon dioxide hydrates

Cited by 57 publications

References 66 publications

Review on Application of Quaternary Ammonium Salts for Gas Hydrate Inhibition

Review on Application of Quaternary Ammonium Salts for Gas Hydrate Inhibition

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

Simulation of Hydrate Phase Boundary for Natural Gas Mixture with High CO2Content through Simulation

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