Clathrate hydrate equilibria in mixed monoethylene glycol and electrolyte aqueous solutions

Chapoy, Antonin; Mazloum, Saeid; Burgass, Rhoderick William; Haghighi, Hooman; Tohidi, Bahman

doi:10.1016/j.jct.2011.12.031

Cited by 26 publications

(23 citation statements)

References 7 publications

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“…In addition, water activity measurements in the TEG solutions (water mass fractions ranged between 0.05 and 0.95) were also carried out at 273.15, 298.15, and 323.15 K. To do so, the LabMaster aw water activity meter (supplied by Novasina) was used. The experimental procedure has also been previously presented …”

Section: Experimental Methodsmentioning

confidence: 99%

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Phase Behavior in Natural Gas + Glycol Systems, Part 1: Tri(ethylene glycol) (TEG) and Its Aqueous Solutions

2021

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Glycols and their aqueous solutions are extensively utilized in the natural gas industry as hydrate inhibitors and desiccant agents. An increasing interest in new applications, such as subsea processing and carbon capture and storage (CCS) gas dehydration, requires evaluations for operations at high pressure. New measurements are presented for methane and a natural gas mixture (methane−ethane−propane− carbon dioxide) in tri(ethylene glycol) (TEG) and TEG aqueous solutions. Solubility measurements were carried out at pressures up to 40 MPa for temperatures T = (273.15 and 353.65) K. Water content data covers temperatures between (278.15 and 313.15) K at p = (6 and 12.5) MPa. In addition, water activities in such solutions are also reported. The experimental data were modeled with three different approaches: the simplified cubic-plus-association (sCPA), a Huron−Vidal Soave−Redlich−Kwong (SRK) equation coupled with the Non-Random Two-Liquid (NRTL) Gibbs energy (g ex ) expression (SRK/HV/NRTL), and the non-density-dependent approach to Peng− Robinson (PR/NDD). The SRK/HV/NRTL model was found wanting for correlating experimental methane solubility data, while the PR/NDD and sCPA were successful in describing the methane/TEG phase behavior but not TEG aqueous solutions. An alternative approach that includes a binary interaction parameter dependent on the liquid phase composition (xk ij ) gave fair to satisfactorily results, particularly in the case of sCPA. For the multicomponent system, sCPA-xk ij has yielded more consistent predictions than PR/NDD-xk ij , especially for total gas solubility. Overall, all the models have failed to give satisfactory results based only on binary parameters.

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Section: Experimental Methodsmentioning

confidence: 99%

“…The experimental procedure has also been previously presented. 31 3. THERMODYNAMIC MODELING Despite the new advances, cubic equations of state (CEoS) are still a benchmarked standard, widely used in the oil and gas industry.…”

Section: Experimental Methodsmentioning

confidence: 99%

Phase Behavior in Natural Gas + Glycol Systems, Part 1: Tri(ethylene glycol) (TEG) and Its Aqueous Solutions

2021

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“…Kontogeorgis et al (2007) stated that CPA and SAFT result in similar predictions for mixtures of water and alcohols (methanol, MEG, and TEG). Also, using the CPA EoS leads to negligible errors for electrolyte mixtures (Chapoy et al 2012b;Ngema et al 2019a, b).…”

Section: Study Aadt % Bmentioning

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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“…Uma prática da indústria de petróleo, para evitar a formação de hidratos durante a etapa de escoamento da mistura do poço de produção até a plataforma, é a injeção de inibidores de formação de hidratos na cabeça do poço. Os inibidores podem ser termodinâmicos ou cinéticos, em quantidades que variam de acordo com as condições de temperatura e pressão do poço (Chapoy et al, 2012). O Monoetilenoglicol (MEG) é o inibidor termodinâmico mais utilizado na indústria de petróleo.…”

Section: Introductionunclassified

1 Modelagem Termodinâmica E Cinética De Precipitação De Sais Na Presença De Glicol

Figueiredo¹,

Barreto²,

Tavares³

2015

Anais Do XX Congresso Brasileiro De Engenharia Química

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RESUMO -A deposição de incrustações em reservatórios e plataformas de petróleo é um problema comum na produção de óleo e gás, trazendo sérios problemas econômicos e operacionais. O monoetilenoglicol (MEG), utilizado como inibidor de formação de hidratos, pode levar a diminuição da solubilidade dos sais, influenciando no processo de precipitação e, consequentemente, incrustações. Diversos estudos termodinâmicos foram realizados, a fim de se determinar as condições favoráveis à precipitação de sais, porém, a determinação da cinética de precipitação é um fator mais complexo e que ainda requer intenso trabalho experimental e de modelagem matemática. Mais raros, e não menos importantes, são os estudos sobre a dinâmica de dissolução de sais precipitados. Método experimental para determinar taxa de dissolução de sais inorgânicos usando apenas uma câmera fotográfica e uma proposta de análise dos resultados são mostrados neste trabalho. Como exemplo, foram obtidos dados de dissolução de NaCl e proposto um modelo para descrever o comportamento dinâmico em diferentes condições de temperatura e concentração de MEG.

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Clathrate hydrate equilibria in mixed monoethylene glycol and electrolyte aqueous solutions

Cited by 26 publications

References 7 publications

Phase Behavior in Natural Gas + Glycol Systems, Part 1: Tri(ethylene glycol) (TEG) and Its Aqueous Solutions

Phase Behavior in Natural Gas + Glycol Systems, Part 1: Tri(ethylene glycol) (TEG) and Its Aqueous Solutions

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

1 Modelagem Termodinâmica E Cinética De Precipitação De Sais Na Presença De Glicol

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