A modified Soave-Redlich-Kwong equation of state for water-hydrocarbon phase equilibria

Kabadi, Vinayak N.; Danner, Ronald P.

doi:10.1021/i200030a004

Cited by 100 publications

(52 citation statements)

References 3 publications

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“…This thermodynamic model was chosen as it provides high accuracy in water-hydrocarbon systems over a wide range of temperatures and predicts the instability of the liquid phase [31]. Additionally, the HCOALGEN and DCOALIGT models were used to calculate enthalpy and density for coal and ash (non-conventional components) [13].…”

Section: Physical Property Methodsmentioning

confidence: 99%

Simulation of Synthesis Gas Production from Steam Oxygen Gasification of Colombian Coal Using Aspen Plus®

et al. 2012

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Abstract:A steady state simulation of syngas production from a Steam Oxygen Gasification process using commercial technologies was performed using Aspen Plus ® . For the simulation, the average proximate and ultimate compositions of bituminous coal obtained from the Colombian Andean region were employed. The simulation was applied to conduct sensitivity analyses in the O 2 to coal mass ratio, coal slurry concentration, WGS operating temperature and WGS steam to dry gas molar ratio (SDG) over the key parameters: syngas molar composition, overall CO conversion in the WGS reactors, H 2 rich-syngas lower heating value (LHV) and thermal efficiency. The achieved information allows the selection of critical operating conditions leading to improve system efficiency and environmental performance. The results indicate that the oxygen to carbon ratio is a key variable as it affects significantly both the LHV and thermal efficiency. Nevertheless, the process becomes almost insensitive to SDG values higher than 2. Finally, a thermal efficiency of 62.6% can be reached. This result corresponds to a slurry solid concentration of 0.65, a WGS process SDG of 0.59, and a LTS reactor operating temperature of 473 K. With these fixed variables, a syngas with H 2 molar composition of 92.2% and LHV of 12 MJ Nm

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Section: Physical Property Methodsmentioning

confidence: 99%

Simulation of Synthesis Gas Production from Steam Oxygen Gasification of Colombian Coal Using Aspen Plus®

et al. 2012

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“…The EOS of Peng and Robinson Robinson, 1976a, 1976b) and the modifi cation of the Redlich-Kwong EOS (Redlich and Kwong, 1949) by Soave (1972) have been applied successfully for water + hydrocarbon systems (Kabadi and Danner, 1985). The parameter a of the SoaveRedlich-Kwong (SRK) equation is defi ned as a(T) = a C a, where a c is the value of the parameter a at the critical point, and a is a function of the reduced temperature and acentric factor of the compound.…”

Section: Cubic Equation Of State For Binary Aqueous Solutionsmentioning

confidence: 99%

“…The original SRK used geometric mixing rule for the parameter a where a ij = (a i a j ) 1/2 and k ij = 0 if i = j. Kabadi and Danner (1985) used the following mixing rule for water + hydrocarbon mixtures values of parameters a′ wi and a″ wi were calculated by Kabadi and Danner (1985) for 32 water + hydrocarbon mixtures at 91 constant temperatures. The term a′ wi was assumed to represent the interactions between water and hydrocarbons molecules.…”

Section: Cubic Equation Of State For Binary Aqueous Solutionsmentioning

confidence: 99%

pVTx Properties of Hydrothermal Systems

Corti

Abdulagatov

2008

Hydrothermal Experimental Data

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“…The usual quadratic mixing rule with a single binary interaction parameter is: Michel et al, (1989) state that such a simple mixing rule is not appropriate for water-hydrocarbon equilibrium calculations. Several authors therefore suggest composition-dependent mixing rules (Daridon et al, 1993;Kabadi and Danner, 1985;Mollerup and Clark, 1989). This approach is essential for describing phase equilibria when the phases have similar compositions.…”

Section: Cubic Equations Of Statementioning

confidence: 99%

The Importance of Water-Hydrocarbon Phase Equilibria During Reservoir Production and Drilling Operations

Zhou

Hemptinne

Dhima

1998

Rev. Inst. Fr. Pét.

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La présence inévitable d'eau dans les réservoirs à hautes pression et température crée de nouveaux défis pour l'ingénieur pétrolier.Un bref état de l'art des équilibres eau-hydrocarbures est présenté dans un premier temps. À haute température, de grandes quantités d'eau peuvent se trouver dans la phase hydrocarbonée (jusqu'à 10 % moles), et à haute pression, on trouvera des quantités non négligeables de gaz dissous dans l'eau. Des mesures de solubilités mutuelles ont donné lieu à un grand nombre de modèles. Étant donné les limites des données expérimentales, les restrictions des modèles sont soulignées. Des études récentes ont indiqué l'intérêt d'utiliser des constantes de Henry pour la prédiction de la solubilité d'hydrocarbures dans l'eau.Les nouveaux défis sont abordés sur la base de quelques publications récentes. L'eau présente en phase hydrocarbonée peut conduire à des dépôts de sels autour du puits, et peut modifier l'estimation de la quantité de gaz en place. Elle peut également donner lieu à une modification des pressions de saturation. La présence d'eau dans les conduites de transport impose un traitement supplémentaire pour éviter la formation d'hydrates.Les hydrocarbures dissous en phase aqueuse peuvent, de leur côté, modifier la composition du fluide, particulièrement lorsque la pression devient très faible. La toxicité de l'eau contenant du H 2 S ou des aromatiques peut créer de réels problèmes lorsqu'il s'agit de nappes aquifères ou lorsqu'il est question de rejeter les eaux de production. Lors du forage, la présence de gaz dissous dans le fluide de forage (souvent à base d'eau) peut représenter un danger réel en causant des éruptions.Une attention particulière doit être portée aux injections de gaz acides dans des réservoirs, car l'effet de ces fluides injectés peut être difficile à prédire.En conclusion, au vu des besoins industriels présentés, des suggestions sont proposées pour des acquisitions de données supplémentaires ou pour améliorer les modèles actuels. The inevitable presence of water in high pressure-high temperature reservoirs leads to a number of new challenges for petroleum engineers.A brief state of the art on water-hydrocarbon phase equilibria is presented. It appears that large amounts of water may be present in the hydrocarbon phase (up to 10% molar), and non negligible amounts of gas can dissolve in water. Based on experimental data, a large number of models have been developed. However, concerning the limitations of the data, caution is expressed about the correctness of some models. Recent studies have proven the usefulness of Henry's constants to predict hydrocarbon solubilities in water.The new challenges that are raised by this problem are discussed based on a number of recent publications. The water present in the hydrocarbon may lead to salt deposits downwell, and it must be taken into account in order to estimate the amount of gas in place. It can also result in modifications of the saturation pressure. Due to the presence of water, additional treatment is needed for pi...

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A modified Soave-Redlich-Kwong equation of state for water-hydrocarbon phase equilibria

Cited by 100 publications

References 3 publications

Simulation of Synthesis Gas Production from Steam Oxygen Gasification of Colombian Coal Using Aspen Plus®

Simulation of Synthesis Gas Production from Steam Oxygen Gasification of Colombian Coal Using Aspen Plus®

pVTx Properties of Hydrothermal Systems

The Importance of Water-Hydrocarbon Phase Equilibria During Reservoir Production and Drilling Operations

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