Development of Predictive Methods of Water–Heavy Oil Phase Equilibrium for Supercritical Water Upgrading Process

Teratani, Shogo; Ota, Masaki; Satō, Yoshiyuki; Inomata, Hiroshi

doi:10.1627/jpi.60.26

Cited by 5 publications

(3 citation statements)

References 14 publications

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“…For the mixture of heavy oil and SC benzene, a single-phase structure can always be maintained despite the difference in the thermodynamic state of benzene. As for the mixture of heavy oil and SC H 2 O following the type IIIb or type II phase behavior defined by van Konynenburg and Scottis, its phase structure is determined simultaneously by the thermodynamic state of water and the operating condition applied. − A condensed oil-in-water emulsion structure could be formed at a low water density, a low water-to-oil ratio, or a low temperature. , At that time, light fractions are extracted into SC H 2 O, leaving heavy fractions concentrated in oil droplets. Driven by the attractive electrostatic interaction between oil fractions and SC H 2 O, the majority of heavy oil fractions tend to dissolve into SC H 2 O along with the increase in water density or temperature.…”

Section: Resultsmentioning

confidence: 99%

Visbreaking of Heavy Oil in Supercritical Benzene

Xue-qin

Yang

et al. 2019

Energy Fuels

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The visbreaking of heavy oil in supercritical benzene ( SC benzene) was investigated. By introducing SC benzene, the visbreaking originally occurring in the oil phase is transferred into SC benzene. The superior diffusivity in SC benzene improves the efficiencies of the initiation and propagation of visbreaking network, by which the reaction could be run in the desired tandem structure. By mitigating diffusion limitation to reaction kinetics, the cracking of alkyl substitutes of aromatics vital to viscosity reduction is accelerated. Being the secondary reaction of the cracking, condensation could be terminated promptly at the shortened reaction time necessary for visbreaking. A comparison between the visbreaking in SC benzene and supercritical water ( SC H 2 O) confirms the effectiveness of improving diffusion for the optimization on heavy oil visbreaking. Nevertheless, the optimal operating conditions involved must be determined experimentally because of the complicated interaction between phase structure and reaction kinetics. The visbreaking in SC benzene shows the advantages of milder operating conditions and better product stability over the visbreaking in SC H 2 O.

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Section: Resultsmentioning

confidence: 99%

Visbreaking of Heavy Oil in Supercritical Benzene

Xue-qin

Yang

et al. 2019

Energy Fuels

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“…Water has a critical temperature of 647 K and a critical pressure of 22.1 MPa. Since the 1990s, the introduction of environmentally friendly supercritical water (SCW) in the upgrading of heavy oil has caused widespread concern in the academic community. − Depending on the mutual solubility between the oil fraction and SCW, the mixture of heavy oil and SCW can exhibit type II or IIIb phase behavior as classified by van Konynenburg and Scott. − Based on the experimental characterization on heavy oil pyrolysis in SCW, various phase structures such as two-phase, oil-in-water emulsion, and pseudo-single-phase structures were further suggested. − …”

Section: Introductionmentioning

confidence: 99%

Demetallization of Heavy Oils of High Metal Content through Pyrolysis under Supercritical Water Environment

Tang

Zheng

et al. 2020

Energy Fuels

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Through pyrolysis under a supercritical water (SCW) environment, the demetallization of Tsingtao vacuum residuum (VR) and Tahe atmospheric residuum (AR) with a total vanadium and nickel content above 300 ppm was studied. By introducing SCW, pyrolysis of heavy oil can be carried out in an emulsion structure in which heavy fractions rich in metals are concentrated in oil droplets. A metal removal rate higher than 90% could be obtained in 2 h, which is faster than the pyrolysis under the nitrogen environment. Although the two heavy oils have similar apparent properties, Tsingtao VR is characterized by the metal enrichment in the heaviest asphaltenes and the higher condensation activity of asphaltenes. Because of the preferential condensation of heavy fractions rich in metals, the liquid product yield of Tsingtao VR could be 15 wt % higher than that of Tahe AR at the metal removal rate of 70% to 90%.

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“…To quantitatively describe the phase behavior of heavy oil and water mixtures, Teratani et al tried to develop a predicative methodology based on the Peng–Robinson (PR) equation of state (EOS) . It was reported that the interaction parameters between water and hydrocarbons are independent of the size of hydrocarbons.…”

Section: Introductionmentioning

confidence: 99%

Upgrading of Tsingtao Vacuum Residuum in Supercritical Water (I): A Preliminary Phase Structure Study by Molecular Dynamics Simulations

et al. 2019

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The dissolution of heavy oil represented by Tsingtao vacuum residuum (VR) in supercritical water (SCH2O) was investigated with molecular dynamics simulations. The dissolution of oil fractions in SCH2O is promoted by the electrostatic attraction with SCH2O but suppressed by the interaction between oil fractions themselves. According to the simulation started with the oil-in-water emulsion structure, light fractions of saturates and aromatics dissolve rapidly in SCH2O. The dissolution of heavy fractions of resins and asphaltenes, which contain a large number of benzene, naphthenic, and heterocyclic rings, in SCH2O, however, is suppressed, and can be adjusted partly by varying the thermodynamic state of water. By the differences in the solubility of oil fractions in SCH2O and the operation conditions applied, the mixture of Tsingtao VR and SCH2O exists in the two-phase, oil-in-water emulsion or the pseudo single-phase structure. In the emulsion structure, the dissolution of light fractions into the continuous SCH2O surroundings is accelerated, leaving heavy fractions concentrated in the oil droplets.

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Development of Predictive Methods of Water–Heavy Oil Phase Equilibrium for Supercritical Water Upgrading Process

Cited by 5 publications

References 14 publications

Visbreaking of Heavy Oil in Supercritical Benzene

Visbreaking of Heavy Oil in Supercritical Benzene

Demetallization of Heavy Oils of High Metal Content through Pyrolysis under Supercritical Water Environment

Upgrading of Tsingtao Vacuum Residuum in Supercritical Water (I): A Preliminary Phase Structure Study by Molecular Dynamics Simulations

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