Thermodynamic Models for Calculating Mutual Solubilities in H2O–CO2–CH4 Mixtures

Austegard, Anders; Solbraa, Even; Koeijer, Gelein de; Mølnvik, Mona J.

doi:10.1205/cherd05023

Cited by 83 publications

(62 citation statements)

References 30 publications

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“…Since the impotence of SPUNG in predicting the solubilities of CO 2 -water was thought to be inherited from SRK due to the use of the symmetric interaction parameter K ij , a simple sensitivity study on the effects of tuning This was thought to be a valid step because SRK-HV showed a significantly good prediction of CO 2 solubility at similar pressure ranges in the work of Austegard et al (2006). In addition, the comparison here, Figs.…”

Section: Effects Of the Interaction Parameter K Ijmentioning

confidence: 94%

“…The SRK-HV was used because it showed very good results for the solubility prediction for the investigated mixtures as reported by Austegard et al (2006). Furthermore, The classical SRK was chosen because SPUNG use it for computing the shape factors and because it is a simple model and is commonly used in industry.…”

Section: Multi-parameter Approaches Like Gerg (Groupe Européen De Recmentioning

confidence: 99%

“…A detailed description of that model has been given by Solbraa (2002). The SRK-HV implementation used in this work has parameters regressed over a wide range of CO 2 -water data, and the regression work is described in detail by Austegard et al (2006). The SRK-HV evaluated in this work uses the Twu-Bluck-Cunningham (TBC) (Twu et al, 1991) formulation for computing the alpha parameter.…”

Section: The Srk Model With Huron-vidal Mixing Rulesmentioning

confidence: 99%

“…The library is a tool for predicting the thermodynamic properties using various approaches that ranges in level of sophistication and underlying theory. The SRK-HV model used here was the one described by Austegard et al (2006) and with the regressed coefficients listed there. The library uses a tolerance of 10 −4 for both the multi-phase flash algorithm and the compressibility factor calculations.…”

Section: Numerical Toolsmentioning

confidence: 99%

See 3 more Smart Citations

Modeling CO2–water mixture thermodynamics using various equations of state (EoSs) with emphasis on the potential of the SPUNG EoS

Ibrahim

Skaugen

Ertesvåg

et al. 2014

Chemical Engineering Science

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Section: Effects Of the Interaction Parameter K Ijmentioning

confidence: 94%

Section: Multi-parameter Approaches Like Gerg (Groupe Européen De Recmentioning

confidence: 99%

Section: The Srk Model With Huron-vidal Mixing Rulesmentioning

confidence: 99%

Section: Numerical Toolsmentioning

confidence: 99%

See 2 more Smart Citations

Modeling CO2–water mixture thermodynamics using various equations of state (EoSs) with emphasis on the potential of the SPUNG EoS

Ibrahim

Skaugen

Ertesvåg

et al. 2014

Chemical Engineering Science

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“…Based on the different oil industry and fuel conversion processes, the possible impurities are summarized in Table 2. Recently, comprehensive reviews on the experimental PVTxy-data of CO 2 /H 2 O and CO 2 /amines have been published [6][7][8][9][10][11][12]. In addition, an extensive review of the available experimental data and models for CO 2 -hydrates has been presented previously [13].…”

Section: Possible Impuritiesmentioning

confidence: 99%

PVTxy properties of CO2 mixtures relevant for CO2 capture, transport and storage: Review of available experimental data and theoretical models

et al. 2011

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Applications of CPA to the Oil and Gas Industry

Kontogeorgis

Folas

2009

Thermodynamic Models for Industrial Applications

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There are various applications in the oil and gas industry where associating and/or oligomeric compounds are present. For these applications, it is expected that association models may be the preferred approach. Some examples are gas hydrate inhibitors, e.g. methanol and glycols, other flow assurance problems, e.g. related to asphaltenes, the variety of drilling, production and injection chemicals used in the oil industry, for which their environmental fate must be assessed and their use must be optimized, and finally the use of ethanol and other oxygenated polar compounds as additives in gasoline. Some of these examples are discussed below in more detail.Methanol is possibly the most important gas hydrate inhibitor. It suppresses gas hydrates but is often injected at a higher rate than necessary, due to uncertainties as to what the correct rate should be. Two important reasons for optimizing the amount of methanol used for inhibition (and keeping it to a minimum) are the cost of providing this chemical, especially on offshore platforms, and the fact that methanol is a toxic substance. The injection rate is directly related to the phase equilibria of mixtures containing oil, water and methanol. Moreover, the loss of hydrate inhibitor in the gas or condensate phases should be accurately known.Typically methanol is not being regenerated because it is relatively inexpensive. Common alternatives to methanol are the glycols, especially monoethylene glycol (MEG), which is added at rates up to 100% of the weight of water. Due to the high cost of MEG, regeneration is required, which, however, adds to the capital and operational cost as well as space requirements, especially for offshore installations. Hence, optimization of the MEG injection rate and minimizing the amount of MEG lost (mainly) in the hydrocarbon liquid and aqueous phases are directly related to the elimination of operational problems and decrease of cost.Another important problem where associating compounds are involved in the petroleum industry is related to the production and processing of natural gas. As previously discussed, the freezing diagrams of MEG-water and methanol-water have two eutectic points and an intermediate phase which indicates the formation of a solid (complex) hydrate between the two compounds. When natural gas is being produced from offshore fields, e.g. in the North Sea, and then transported to the gas plant, it is brought to sales gas specifications by a series of separators. In order to prevent the formation of gas hydrates during transportation and further processing, inhibitors such as ethylene glycol (MEG) are continuously added to the produced mixture (water and light hydrocarbons). Decreased efficiency has been observed in the separators at MEG concentrations, where according to the literature problem-free operation would be expected. This means that the concentration of ethylene glycol is high enough to inhibit formation of gas hydrates and low enough to prevent freezing of ethylene glycol. Experimental investigations indic...

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Thermodynamic Models for Calculating Mutual Solubilities in H2O–CO2–CH4 Mixtures

Cited by 83 publications

References 30 publications

Modeling CO2–water mixture thermodynamics using various equations of state (EoSs) with emphasis on the potential of the SPUNG EoS

Modeling CO2–water mixture thermodynamics using various equations of state (EoSs) with emphasis on the potential of the SPUNG EoS

PVTxy properties of CO2 mixtures relevant for CO2 capture, transport and storage: Review of available experimental data and theoretical models

Applications of CPA to the Oil and Gas Industry

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