Prediction of water solubility in petroleum fractions and heavy crudes using cubic-plus-association equation of state (CPA-EoS)

Zirrahi, Mohsen; Abedi, Jalal

doi:10.1016/j.fuel.2015.07.058

Cited by 33 publications

(8 citation statements)

References 24 publications

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“…The reaction kinetics of the hydrogen abstraction, which is a bimolecular reaction, is sensitive to diffusivity. A calculation with the recommended CPA-SRK equation of state suggests that the solubility of sub-CW in the heavy oil used is 2.9 wt % at 350 °C, 3.3 wt % at 360 °C, and 3.8 wt % at 370 °C . By solubilizing sub-CW into heavy oil, the viscosity of the heavy oil is reduced, thereby improving dealkylation.…”

Section: Results and Discussionmentioning

confidence: 99%

“…It is worth noting that previous studies on heavy oil visbreaking in sub-CW environments often require several hours to achieve effective viscosity reduction . One of the important reasons is that the phase equilibrium between heavy oil and sub-CW is characterized by the solubilization of sub-CW into heavy oil. − The viscosity of the oil phase decreases in proportion to the mass fraction of solubilized water, which obviously cannot be compared with the viscosity of SCW in heavy oil/SCW systems. According to visual observation in an optical cell, light aromatics with less than four rings have good solubility with sub-CW and SCW .…”

Section: Introductionmentioning

confidence: 99%

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Visbreaking of Heavy Oil in a Mixed Solvent of Subcritical Water and Light Aromatics

Ling

Zhu

et al. 2021

Ind. Eng. Chem. Res.

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To achieve high-efficiency viscosity reduction in a mild hydrothermal environment, the visbreaking of heavy oil in a mixed solvent of subcritical water (sub-CW) and light aromatics was investigated. By solubilizing sub-CW in heavy oil, the dealkylation involved in visbreaking follows not only a free radical mechanism but also an ionic mechanism. The further introduction of light cycle oil rich in light aromatics but containing olefin groups has a complicated influence on visbreaking. Because of the presence of olefin groups, the viscosity reduction efficiency is initially reduced. In addition, the condensation to asphaltenes is promoted in the late visbreaking stage. However, these adverse effects are offset by the promotion of the solubilization of sub-CW in heavy oil by light aromatics. With enhanced dealkylation in both free radical and ionic mechanisms, a viscosity reduction rate of over 90% and reduced asphaltene formation can be obtained in the middle stage of visbreaking.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Visbreaking of Heavy Oil in a Mixed Solvent of Subcritical Water and Light Aromatics

Ling

Zhu

et al. 2021

Ind. Eng. Chem. Res.

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“…No explicit assumptions regarding the configuration of intermolecular networks have been made. This is in contrast to some recent modeling approaches such as those of Oliveira et al (2007) and Zirrahi et al (2015), who used complex semi-empirical fluid models. Experimental evidence on the nature of intermolecular interactions in the L phase of water/hydrocarbon mixtures at elevated temperatures have not been published, to the best of our knowledge.…”

Section: Introductionmentioning

confidence: 83%

Compositional Mechanisms in SAGD and ES-SAGD With Consideration of Water Solubility in Oil

Venkatramani

Okuno

2016

Day 2 Wed, June 08, 2016

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Experimental data have shown that the solubility of water in the oleic (L) phase (x wL ) can be significant at elevated temperatures. However, x wL was not properly considered in prior studies of SAGD and ES-SAGD. The main objective of this research is to present a detailed study of compositional mechanisms in SAGD and ES-SAGD simulation by considering x wL . The importance of properly considering x wL is shown in economic evaluation of these bitumen-recovery processes.The phase-behavior models used in this research are carefully created on the basis of experimental studies presented in the literature. Mechanistic simulation studies are then conducted for SAGD and ES-SAGD. Co-injectants used in ES-SAGD simulations range from propane through n-decane.Results show that x wL enhances bitumen production in both SAGD and ES-SAGD mainly because x wL results in reduction of L-phase viscosity. The enhancement is more significant when the chamber-edge temperature is higher, because x wL increases with temperature. The enhancement of bitumen production observed in the case studies is 7.66% for SAGD, 4.08% for C 6 -SAGD, and 4.85% for C 8 -SAGD for a fixed period of operation at 35 bars. It is important to consider x wL in SAGD and ES-SAGD simulations, because the relative performance of ES-SAGD to SAGD tends to be overestimated without considering x wL .On the basis of a sensitivity analysis for economic performance of ES-SAGD, a guideline is presented to leverage x wL to improve bitumen production in ES-SAGD. As discussed in our prior research, solvent becomes effective in diluting bitumen and reducing steam requirement, only when it sufficiently accumulates near the chamber edge. New results show that water can act as a diluting agent until solvent sufficiently accumulates near the chamber edge.

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“…Different ways for describing phase equilibria of poorly specified mixtures have been described in the literature: in petrochemistry, fraction‐wise characterization of the mixtures is common, see, for example, References , and continuous thermodynamics has been applied for describing polymer systems, see, for example, References . In this work, we present a generic approach to tackle the problem of poorly specified mixtures in process design.…”

Section: Introductionmentioning

confidence: 99%

Application of NEAT for the simulation of liquid–liquid extraction processes with poorly specified feeds

2019

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The conceptual design of fluid separation processes is particularly challenging if the considered mixtures are poorly specified, since classical thermodynamic models cannot be applied when the composition is unknown. We have recently developed a method (NEAT) to predict activity coefficients in such mixtures. It combines the thermodynamic group contribution concept with the ability of NMR spectroscopy to quantify chemical groups. In the present work, we describe how NEAT can be applied to equilibrium stage simulations of liquid-liquid extraction processes with poorly specified feeds. Only a single 13 C NMR spectrum of the feed is needed for predicting the distribution of a target component for different process parameters, such as temperature or extracting agent. The predictions from several test cases are compared to results that are obtained using the full knowledge on the composition of the feed and surprisingly good agreement is found.

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Prediction of water solubility in petroleum fractions and heavy crudes using cubic-plus-association equation of state (CPA-EoS)

Cited by 33 publications

References 24 publications

Visbreaking of Heavy Oil in a Mixed Solvent of Subcritical Water and Light Aromatics

Visbreaking of Heavy Oil in a Mixed Solvent of Subcritical Water and Light Aromatics

Compositional Mechanisms in SAGD and ES-SAGD With Consideration of Water Solubility in Oil

Application of NEAT for the simulation of liquid–liquid extraction processes with poorly specified feeds

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