Multiphase flash calculations for gas hydrates systems

Sirino, Thales; Neto, Moisés A. Marcelino; Bertoldi, Dalton; Morales, Rigoberto E. M.; Sum, Amadeu K.

doi:10.1016/j.fluid.2018.07.029

Cited by 20 publications

(19 citation statements)

References 129 publications

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“…The blue continuous lines are predictions by PVTsim, and the black dash-dot line is from CSMGem . The red continuous line is the prediction from the model by Sirino et al…”

Section: Resultsmentioning

confidence: 99%

“…CO 2 hydrates equilibrium points with fresh water. Experimental data from this work (black diamonds) compared with available literature data (yellow triangles; green squares; yellow circles; red squares; green triangles; red circles; green circle, Q 2 ; yellow square, Q 2 ; and red triangle, Q 2 ) and predictions by models (black solid lines, Multiflash; blue solid line, PVTsim; dash-dot line, CSMGem; and red solid line, model by Sirino et al).…”

Section: Resultsmentioning

confidence: 99%

“…For each system and prediction, the average absolute deviation (AAD) was calculated with eq . Multiflash uses the cubic-plus-association (CPA) equation of state (EoS), PVTsim uses a modified version of the Soave–Redlich–Kwong (SRK) EoS, and CSMGem uses the traditional SRK EoS. The model by Sirino et al also uses the CPA EoS. All of these models use the van der Waals–Platteeuw (vdW–P) hydrate prediction model, optimizing its parameters with experimental hydrate equilibrium data.…”

Section: Resultsmentioning

confidence: 99%

“…The consistency of the acquired data was verified through the Clausius–Clapeyron equation and water activity. Finally, the accuracies of four different prediction tools (Multiflash, PVTsim, CSMGem, and the Sirino et al model) were evaluated.…”

Section: Introductionmentioning

confidence: 99%

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Phase Equilibrium of Carbon Dioxide Hydrates Inhibited with MEG and NaCl above the Upper Quadruple Point

et al. 2019

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Exploration of oil fields with high concentrations of carbon dioxide brings new challenges to the oil and gas industry. The high pressures reached in production pipelines can cause the condensation of the gas phase, characterizing the appearance of an upper quadruple point in the hydrate phase diagram. To prevent the formation of hydrates, the use of thermodynamic inhibitors, such as alcohols and glycols, is common in the industry. In addition, water from oil production is naturally inhibited with salts, such as NaCl. In this work, equilibrium data not previously reported for CO2 hydrates inhibited with MEG and NaCl were determined for pressures between 8.5 and 25 MPa using an isobaric experimental procedure. By the Clausius–Clapeyron relation and concepts of water activity, the consistency of the data was evaluated with promising results. A comparison of the measured data obtained in this work with prediction tools (Multiflash, PVTsim, and CSMGem) and the model by Sirino et al.30 [Fluid Phase Equilib.20184754563] was done.

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“…The blue continuous lines are predictions by PVTsim, and the black dash-dot line is from CSMGem . The red continuous line is the prediction from the model by Sirino et al…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Phase Equilibrium of Carbon Dioxide Hydrates Inhibited with MEG and NaCl above the Upper Quadruple Point

et al. 2019

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“…In the presence of inhibitors, such as salt and alcohols like methanol and ethanol, by coupling the van der Waals model with the Cubic-Plus-Association equation of state (CPA + EOS [24]). Waseem and Alsaifi carried out equilibrium prediction using the van der Waals model and SAFT VR Mie EOS in conjunction with squarewell (SW), Lennard-Jones (LJ), and Mie potentials for 10 different gases [25].…”

Section: Introductionmentioning

confidence: 99%

Hydrates of Binary Guest Mixtures: Fugacity Model Development and Experimental Validation

Kumari

Khan

Misra³

et al. 2020

Journal of Non-Equilibrium Thermodynamics

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A fugacity-based thermodynamic model for hydrate has been used to determine the equilibrium pressures of hydrate formation. This fugacity-based model uses the PRSV equation of state, which is used to represent the gas phases in the hydrate. The parameters of the model are fitted to the experimental data of binary guest hydrates. The present study is aimed at investigating binary mixtures of CH 4 -H 2 S, C 3 H 8 -N 2 , N 2 -CO 2 , CH 4 -i-butane, C 3 H 8 -i-butane, CH 4 -n-butane, C 3 H 8 -n-butane, i-butane-CO 2 , and n-butane-CO 2 hydrates, which have not been modeled before. Unlike previous studies, the Kihara potential parameters were obtained using the second virial coefficient correlation and the data of viscosity for gases. The fugacity-based model provides reasonably good predictions for most of the binary guest hydrates (CH 4 -C 3 H 8 ). However it does not yield good prediction for hydrates of (CO 2 -C 3 H 8 ). The transitions of hydrate structure from sI to sII and from sII to sI have been also predicted by this model for binary guest hydrates. The AAD % calculated using the experimental data of natural gas hydrates is only 10 %, which is much lower than the AAD % calculated for the equilibrium data predicted by the VdP-w model.

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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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Multiphase flash calculations for gas hydrates systems

Cited by 20 publications

References 129 publications

Phase Equilibrium of Carbon Dioxide Hydrates Inhibited with MEG and NaCl above the Upper Quadruple Point

Phase Equilibrium of Carbon Dioxide Hydrates Inhibited with MEG and NaCl above the Upper Quadruple Point

Hydrates of Binary Guest Mixtures: Fugacity Model Development and Experimental Validation

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

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