Four phase hydrate equilibria of methane and carbon dioxide with heavy hydrate former compounds: Experimental measurements and thermodynamic modeling

Tavasoli, Hamed; Feyzi, Farzaneh

doi:10.1007/s11814-016-0110-x

Cited by 4 publications

(4 citation statements)

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“…Among various guest materials, methane (CH 4 ) and carbon dioxide (CO 2 ) have attracted the most attention from energy and environmental points of views. ,− CH 4 can exist as the gas hydrate when CH 4 gas from biogenic or thermogenic origin meets water molecules under natural low-temperature and high-pressure conditions (for example, in permafrost regions and deep-sea sediments). The contents of such natural gas hydrates are estimated to be as large as the total of all other fossil fuels. ,, For organic clathrates, Lee et al reported the formation of CH 4 -loaded HQ clathrate by means of the dry synthesis method and analyzed the samples using spectroscopic measurements .…”

Section: Introductionmentioning

confidence: 99%

Swapping and Enhancement of Guest Occupancies in Hydroquinone Clathrates Using CH₄ and CO₂

et al. 2019

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In this study, we investigated guest behaviors of CO2 and CH4 molecules during the initial formation of hydroquinone (HQ) clathrates and then the swapping reactions of guest-loaded HQ. Two experimental pressures of 3.0 and 5.0 MPa were selected for both formation and swapping reactions at room temperature, both of which are known to be in the stability region of HQ clathrates. Prepared samples were analyzed by a series of spectroscopic measurements to obtain qualitative and quantitative information on guest molecules in clathrate cages. After the initial formation, CO2 molecules showed higher cage occupancies of 90.1 ± 3.9 and 99.4 ± 2.7%, with full conversion into the clathrate form, compared to the values of 61.9 ± 4.2 and 64.6 ± 4.5% with incomplete conversion for CH4 molecules at 3.0 and 5.0 MPa, respectively. In the subsequent swapping reactions, 72–77% of CH4 molecules in guest-loaded HQ clathrate are replaced with CO2, while only 6–9% of CO2 molecules are replaced with CH4 molecules. The experimental results demonstrated that kinetic behaviors of CO2 molecules are better favored than CH4 molecules in HQ clathrates, even though their thermodynamic equilibria are almost identical.

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Section: Introductionmentioning

confidence: 99%

Swapping and Enhancement of Guest Occupancies in Hydroquinone Clathrates Using CH₄ and CO₂

et al. 2019

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“…However, CPA application for the vapor-liquid equilibria (VLE) (Folas et al 2006) and liquid-liquid equilibria (LLE) (Oliveira et al 2007) of natural gas hydrate composition has been investigated before 2007; Kontogeorgis et al (2007) were the first ones to combine CPA EoS with the vdW-P model and suggested reliable models for the phase behavior of water, alcohols, and natural gas components. Tavasoli et al (2016) investigated the influence of cyclic hydrocarbons (i.e., benzene and cyclohexane) on the methane and CO 2 hydrates. They implemented the fugacitybased model, in which Valderrama-Patel-Teja (VPT) EoS [with non-density-dependent (NDD) mixing rule] (Valderrama 1990) and Statistical Associating Fluid Theory EoS presented by Huang and Radosz (SAFT-HR) Radosz 1990, 1991) were compared.…”

Section: Resultsmentioning

confidence: 99%

“…Several factors influence the hydrate equilibrium calculations including: the hydrate model selection, the appropriate EoS selection, type of hydrate former, existence of inhibitors Fig. 3 Comparison of the experimental data (Sun et al 2002;Tohidi et al 1996;Tavasoli and Feyzi 2016;Danesh et al 1993;Mohammadi et al 2009a;Tavasoli and Feyzi 2016;Mooijer-van den Heuvel et al 2001) and the predictions of SAFT-HR and VPT EoSs (Tavasoli and Feyzi 2016) for the effect of cyclic hydrocarbons on the methane and CO 2 gas hydrates and promoters in the system, and choosing the proper statistical or empirical relations for calculation of the Langmuir constants. In the thermodynamic modeling of hydrate equilibrium conditions, two approaches are used in the literature.…”

Section: Resultsmentioning

confidence: 99%

An insight into the role of the association equations of states in gas hydrate modeling: a review

et al. 2020

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Encouraged by the wide spectrum of novel applications of gas hydrates, e.g., energy recovery, gas separation, gas storage, gas transportation, water desalination, and hydrogen hydrate as a green energy resource, as well as CO2 capturing, many scientists have focused their attention on investigating this important phenomenon. Of course, from an engineering viewpoint, the mathematical modeling of gas hydrates is of paramount importance, as anticipation of gas hydrate stability conditions is effective in the design and control of industrial processes. Overall, the thermodynamic modeling of gas hydrate can be tackled as an equilibration of three phases, i.e., liquid, gas, and solid hydrate. The inseparable component in all hydrate systems, water, is highly polar and non-ideal, necessitating the use of more advanced equation of states (EoSs) that take into account more intermolecular forces for thermodynamic modeling of these systems. Motivated by the ever-increasing number of publications on this topic, this study aims to review the application of associating EoSs for the thermodynamic modeling of gas hydrates. Three most important hydrate-based models available in the literature including the van der Waals–Platteeuw (vdW–P) model, Chen–Guo model, and Klauda–Sandler model coupled with CPA and SAFT EoSs were investigated and compared with cubic EoSs. It was concluded that the CPA and SAFT EoSs gave very accurate results for hydrate systems as they take into account the association interactions, which are very crucial in gas hydrate systems in which water, methanol, glycols, and other types of associating compounds are available. Moreover, it was concluded that the CPA EoS is easier to use than the SAFT-type EoSs and our suggestion for the gas hydrate systems is the CPA EoS.

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“…Lines: full, this work; dashed, Multiflash results. Data are from Tavasoli and Feyzi (○) and Adisamito et al (Δ).…”

Section: Resultsmentioning

confidence: 99%

Modeling of Hydrate Dissociation Curves with a Modified Cubic-Plus-Association Equation of State

Palma

Queimada

Coutinho

2019

Ind. Eng. Chem. Res.

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A modified cubic-plus-association equation of state (CPA EoS) has been presented in recent works that enforces the representation of the pure component critical point, is based on an extended Mathias–Copeman α function, and uses a volume shift to improve liquid densities. In this work, this same version of the CPA model is applied together with the hydrate van der Waals and Platteeuw model for the description of hydrate dissociation curves. The model is applied to the description of both single and mixed guest hydrates, the results being compared with the available experimental data, and the predictions obtained using the commercial hydrates model from the Multiflash software. This analysis shows that, for most cases, this approach is accurate, with results similar to those of Multiflash. The accuracy of the model for describing the three phase compositions in hydrate + liquid + gas systems is also discussed.

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Four phase hydrate equilibria of methane and carbon dioxide with heavy hydrate former compounds: Experimental measurements and thermodynamic modeling

Cited by 4 publications

References 74 publications

Swapping and Enhancement of Guest Occupancies in Hydroquinone Clathrates Using CH₄ and CO₂

Swapping and Enhancement of Guest Occupancies in Hydroquinone Clathrates Using CH₄ and CO₂

An insight into the role of the association equations of states in gas hydrate modeling: a review

Modeling of Hydrate Dissociation Curves with a Modified Cubic-Plus-Association Equation of State

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Four phase hydrate equilibria of methane and carbon dioxide with heavy hydrate former compounds: Experimental measurements and thermodynamic modeling

Cited by 4 publications

References 74 publications

Swapping and Enhancement of Guest Occupancies in Hydroquinone Clathrates Using CH4 and CO2

Swapping and Enhancement of Guest Occupancies in Hydroquinone Clathrates Using CH4 and CO2

An insight into the role of the association equations of states in gas hydrate modeling: a review

Modeling of Hydrate Dissociation Curves with a Modified Cubic-Plus-Association Equation of State

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Swapping and Enhancement of Guest Occupancies in Hydroquinone Clathrates Using CH₄ and CO₂

Swapping and Enhancement of Guest Occupancies in Hydroquinone Clathrates Using CH₄ and CO₂