Modelling gas hydrate thermodynamic behaviour: theoretical basis and computational methods

Avlonitis, Dimitrios; Varotsis, Nikos

doi:10.1016/s0378-3812(96)90017-5

Cited by 12 publications

(24 citation statements)

References 31 publications

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“…The hydrate phase equilibria prediction program that we deploy here, has been extensively tested in the past against all the then available experimental data3, 24. Nevertheless, prior to applying this method we had investigated the capability of the phase equilibria model to predict correctly the experimental phase equilibria findings of the last years in cases where other works had been reported in the literature as failed.…”

Section: Applicationmentioning

confidence: 99%

An investigation of gas hydrates formation energetics

Avlonitis

2005

AIChE Journal

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Section: Applicationmentioning

confidence: 99%

An investigation of gas hydrates formation energetics

Avlonitis

2005

AIChE Journal

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“…A general phase equilibrium model based on uniformity of the fugacity of each component throughout all the phases , was extended to model the equilibrium conditions of nitrogen and oxygen (hence air) hydrates. A single equation of state (EoS), namely, the Valderrama modification of the Patel and Teja equation of state (VPT EoS) with non-density-dependent mixing rules, was used to determine component fugacities in all fluid phases.…”

Section: Thermodynamic Modelingmentioning

confidence: 99%

Equilibrium Data and Thermodynamic Modeling of Nitrogen, Oxygen, and Air Clathrate Hydrates

2003

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Air hydrates can form at high-pressure and low-temperature conditions found in deep ice sheets of Arctic and Antarctic regions. These hydrates can play a major role in analyzing the data gathered in these regions. However, there are limited experimental data and thermodynamic modeling on air hydrates. In this work, we present new experimental data on methane, nitrogen, oxygen, and air hydrates. An experimental setup based on a quartz crystal microbalance (QCM) has been used in measuring all the experimental data reported in this work. The QCM method needs much smaller samples, resulting in a significant reduction in the time required for each experiment. The available data on oxygen hydrates are used in optimizing the Kihara potential parameters for oxygen hydrates. Using the previously reported nitrogen Kihara potential parameters and the optimized Kihara potential parameters for oxygen, the hydrate stability zone of air hydrates (21 mol % oxygen and 79 mol % nitrogen) has been predicted. The predictions of the thermodynamic model are in good agreement with the independent experimental data on air hydrates, demonstrating the reliability of experimental and modeling techniques used in this work.

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“…Comparison of hydrate equilibrium of 84.13% CH 4 + 4.67% C 2 H 6 + 2.34% C 3 H 8 + 0.93% n -C 4 H 10 + 0.93% n -C 5 H 12 + 7% N 2 with 10.0% methanol with HEP, CSMHYD, CSMGem, and HydraFLASH, and experimental data.…”

Section: Resultsmentioning

confidence: 99%

“…The software is tested by comparing its results with experimental data and other similar software CSMHYD, CSMGem, and HydraFLASH, which are commonly used in hydrate studies and projects. 19 Finally, in order to test HEP code, the experimental hydrate equilibrium data of 84.13% CH 4 , 4.67% C 2 H 6 , 2.34% C 3 H 8 , 0.93% n-C 4 H 10 , 0.93% n-C 5 H 12 , 7% N 2 with 10.0% methanol mixture 72 was selected. HEP fits to the experimental data very well with 99.23% R 2 as seen in Table 2.…”

Section: ∑ ∑mentioning

confidence: 99%

New Software That Predicts Hydrate Properties and Its Use in Gas Hydrate Studies

Merey

Sınayuç

2016

J. Chem. Eng. Data

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Gas hydrates have become very popular recently especially as an energy source and a transportation medium. The estimations of hydrate properties such as hydrate equilibrium pressure, cage occupancy, density, mass, hydration number, and enthalpy of hydrate dissociation are quite important. In this study, several codes that are written using Matlab 2014a were explained. These codes, namely HEP.m, HEPComp.m, Sm.m, SmMix.m, and BSR.m are used together for the determination of hydrate properties. HEP.m is used to estimate hydrate equilibrium properties and was integrated with HEPComp.m which calculates gas compositional change of feed gas during hydrate formation of gas mixtures, Sm.m and SmMix.m, which are used to determine the amount of gas and water needed to obtain target saturation in experimental studies of hydrate, formed in sediments inside high pressure reactors. Finally, BSR.m code was written to predict gas composition near the line bottom simulating reflectance (BSR) in ocean sediments. BSR lines indicate the possible locations of gas hydrates in nature. To understand the reliability of the codes written in this study, they were tested and compared with experimental data, other software, and literature data. According to the results of comparison studies, very good results were obtained so the codes in this study are suggested to be used in gas hydrate studies.

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Modelling gas hydrate thermodynamic behaviour: theoretical basis and computational methods

Cited by 12 publications

References 31 publications

An investigation of gas hydrates formation energetics

An investigation of gas hydrates formation energetics

Equilibrium Data and Thermodynamic Modeling of Nitrogen, Oxygen, and Air Clathrate Hydrates

New Software That Predicts Hydrate Properties and Its Use in Gas Hydrate Studies

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