Determination of clathrate hydrates dissociation conditions in the presence of gas dehydration, sweetening, and other nitrogenated additives using a predictive thermodynamic approach

Rasoolzadeh, Ali; Bakhtyari, Ali; Mehrabi, Khayyam; Javanmardi, Jafar; Nasrifar, Khashayar; Mohammadi, Amir H.

doi:10.1016/j.jngse.2022.104773

Cited by 8 publications

(11 citation statements)

References 104 publications

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“…For a better understanding of the PVCap-7k promotion effect and TEG inhibition effect, water activity in the attendance of PVCap-7k and TEG was calculated using the FH model. − Figure exhibits a comparison between the experimental water activity data and the water activity results computed with the FH model − in the presence of TEG, methanol, and MEG.…”

Section: Resultsmentioning

confidence: 99%

“…Comparison between the experimental water activity data in the presence of TEG, methanol, and MEG and water activity results calculated with the FH model. ,− …”

Section: Resultsmentioning

confidence: 99%

“…Moreover, Δμ w 0 stands for the difference between the water chemical potential in an unstable hydrate lattice and the aqueous liquid/ice phase at reference conditions, Δ h w β‑ L / I and Δv w β‑ L /I denote the molar enthalpy and molar volume differences between an empty hydrate and the aqueous liquid phase, respectively . Δ h w β‑L/I has the following temperature dependency: − The details of the vdW-P model were well discussed in previous studies. ,,,, …”

Section: Thermodynamic Modelingmentioning

confidence: 99%

“…In the presence of additives, the water activity deviates from one. In this work, to calculate the water activity in the attendance of PVCap-7k and TEG, the FH model is utilized. − This model results in excellent accuracy in the polymer solutions and the systems having great dissimilarities in molecular sizes and is as follows: ,− where x w is the mole fraction of water in an aqueous liquid solution: where n represents number of additives. The solubility of methane in water can be calculated by the following relation: a w FVFH is the activity of water obtained by the FH model, γ w FVFH the water activity coefficient obtained by the FH model, φ the volume fraction of the additive, and r the dimensionless ratio of additive to water molar volumes.…”

Section: Thermodynamic Modelingmentioning

confidence: 99%

“…It is worth mentioning that, for PVCap-7k + TEG aqueous mixtures, the water activity in the attendance of PVCap-7k and TEG is calculated independently and the final value of water activity can be obtained as follows: − …”

Section: Thermodynamic Modelingmentioning

confidence: 99%

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Impacts of Triethylene Glycol and Polyvinyl Caprolactam on Dissociation Conditions and Complete Inhibition Region of Methane Hydrate

Hamidpour,

Javanmardi,

Rasoolzadeh

et al. 2023

Energy Fuels

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In nearly all cases, the strength of low-dosage hydrate inhibitors (LDHIs) is evaluated by a comparison of the induction time. Since hydrate nucleation has a stochastic nature, measurement and correlation of the induction time are troublous and nonrepeatable. Thus, the development of new techniques to make the performance of LDHIs predictable and repeatable is necessary. This work aimed at employing the crystal growth inhibition (CGI) approach as a well-known repeatable technique to determine the complete inhibition region (CIR) of methane hydrate in the simultaneous attendance of triethylene glycol (TEG) as thermodynamic hydrate inhibitor (THI) and polyvinyl caprolactam (PVCap-7k) as LDHI. To determine the CIR, the hydrate dissociation measurements were carried out. For this purpose, two aqueous solutions of (0.46 wt % PVCap-7k + 15.00 wt % TEG), and (1.00 wt % PVCap-7k + 15.00 wt % TEG) were prepared. In the previous studies, the dissociation conditions of methane hydrate in the attendance of 0.10, 0.25, and 0.49 wt % of PVCap-7k were experimentally measured. To compare the inhibition impacts of TEG + PVCap-7k with PVCap-7k, the dissociation conditions of methane hydrate in the attendance of (1.00 wt % PVCap-7k) were also experimentally measured. Moreover, for thermodynamic modeling, a package including the van der Waals−Platteeuw (vdW-P) model for the hydrate phase, the Peng−Robinson (PR) equation of state (EoS) for the vapor-gas phase, and the Flory−Huggins (FH) model for the calculation of the water activity in an aqueous liquid phase was applied. It is concluded that the combined utilization of TEG and PVCap-7k results in a thermodynamic promotion impact on the methane hydrate. This is due to the strong thermodynamic promotion effect of PVCap that overcomes the thermodynamic inhibition impact of TEG. From the kinetic viewpoint, the combined utilization of TEG and PVCap-7k leads to a wide CIR (between 9 and 11.5 °C) which means a strong kinetic inhibition performance.

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Section: Resultsmentioning

confidence: 99%

“…Comparison between the experimental water activity data in the presence of TEG, methanol, and MEG and water activity results calculated with the FH model. ,− …”

Section: Resultsmentioning

confidence: 99%

Section: Thermodynamic Modelingmentioning

confidence: 99%

Section: Thermodynamic Modelingmentioning

confidence: 99%

Section: Thermodynamic Modelingmentioning

confidence: 99%

See 3 more Smart Citations

Impacts of Triethylene Glycol and Polyvinyl Caprolactam on Dissociation Conditions and Complete Inhibition Region of Methane Hydrate

Hamidpour,

Javanmardi,

Rasoolzadeh

et al. 2023

Energy Fuels

Self Cite

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Thermodynamic modelling of gas hydrate dissociation conditions in porous medium in the presence of NaCl/methanol aqueous solution

Hashemzadeh,

Javanmardi,

Rasoolzadeh

et al. 2024

Can J Chem Eng

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Due to the growing significance of the existence of gas hydrates in natural media like the ocean floor/permafrost regions and the extraction of natural gas from hydrate reservoirs using thermodynamic hydrate inhibitors, investigating the dissociation of gas hydrates in porous media in the presence of inhibitors is crucial. This work examines a broad range of laboratory data on the dissociation conditions of gas hydrates in the porous mediums when salt/alcohol aqueous solutions are present. The temperature of gas hydrate dissociation in the presence of pure water is calculated using the van der Waals–Platteeuw solid solution theory. The water activity in the porous medium is then calculated by taking into account a number of variables, including the radius of the porous medium, molar volume, shape factor, wetting angle, and surface tension. The Pitzer and Margules activity coefficient models are used to determine the water activity in the presence of salt and alcohol, respectively. Lastly, the gas hydrate dissociation temperature in a porous medium in the presence of salt and/or alcohol aqueous solution is determined by combining Piereon's model with an enthalpy‐based correlation that was proposed by Azimi et al. The selected package can consistently correlate the gas hydrate dissociation conditions in a porous medium in the presence of alcohol or salt aqueous solution. The average absolute deviation (AAD) of 0.67 K for the whole data bank (90 experimental data points) shows the precision of the model.

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Natural gas thermodynamic hydrate inhibitors

Bakhtyari,

Rasoolzadeh,

Mehrabi

et al. 2024

Advances in Natural Gas: Formation, Processing, and Applications. Volume 3: Natural Gas Hydrates

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Determination of clathrate hydrates dissociation conditions in the presence of gas dehydration, sweetening, and other nitrogenated additives using a predictive thermodynamic approach

Cited by 8 publications

References 104 publications

Impacts of Triethylene Glycol and Polyvinyl Caprolactam on Dissociation Conditions and Complete Inhibition Region of Methane Hydrate

Impacts of Triethylene Glycol and Polyvinyl Caprolactam on Dissociation Conditions and Complete Inhibition Region of Methane Hydrate

Thermodynamic modelling of gas hydrate dissociation conditions in porous medium in the presence of NaCl/methanol aqueous solution

Natural gas thermodynamic hydrate inhibitors

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