Impact of vaporization in a residue hydroconversion process

Gauthier, Thierry; Heraud, Jean-Philippe; Kressmann, S.; Verstraete, J.

doi:10.1016/j.ces.2006.12.086

Cited by 15 publications

(16 citation statements)

References 5 publications

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“…A study of the vaporization of liquid feed hydrocarbons at bench-scale for a specified feedstock demonstrated that non-negligible fractions (measured to be in the range of 15−35% by weight depending on conversion), once converted, vaporize thus contributing volume to the gas phase. 31 For the correlation proposed by Eccles, 8 a solid-free gas holdup of approximately 10% is predicted with actually no treat gas flow. This is consistent with the vaporization of converted volatile hydrocarbon.…”

Section: Rementioning

confidence: 91%

“…Conversion of feed VR to volatile hydrocarbon product is expected to contribute to the overall reactor gas superficial velocity and holdup. A study of the vaporization of liquid feed hydrocarbons at bench-scale for a specified feedstock demonstrated that non-negligible fractions (measured to be in the range of 15–35% by weight depending on conversion), once converted, vaporize thus contributing volume to the gas phase . For the correlation proposed by Eccles, a solid-free gas holdup of approximately 10% is predicted with actually no treat gas flow.…”

Section: Numerical Methodologymentioning

confidence: 99%

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Modeling the Fluid Dynamics of a Commercial Ebullated Bed Hydroprocessor

Lane

Macchi

Pjontek

et al. 2019

Ind. Eng. Chem. Res.

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Ebullated bed hydroprocessors are a widely adopted technology for the upgrading of heavy oil. Because of the energy-intensive nature of this process, improvements and optimizations are highly desirable. As such, a complete understanding of the complex multiphase fluid dynamics in these units is still required to provide insight for future performance improvement. Specifically, current literature has not addressed the performance of the internal gas–liquid separation within the reactor and the impact of resulting entrained gas on overall reactor fluid dynamics. In this study, a novel numerical fluid dynamic model for a commercial scale ebullated bed hydroprocessor is proposed. A liquid residence time-based gas–liquid separation model is shown to be representative through analysis of commercial operating data. Freeboard gas holdups are predicted within 4% points for two generations of liquid recycle pans. Recycle pump speed is estimated within 10% points for the flow through pan.

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Section: Rementioning

confidence: 91%

Section: Numerical Methodologymentioning

confidence: 99%

Modeling the Fluid Dynamics of a Commercial Ebullated Bed Hydroprocessor

Lane

Macchi

Pjontek

et al. 2019

Ind. Eng. Chem. Res.

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“…For this purpose, the Peng-Robinson equation of state (Peng and Robinson, 1976) is implemented (Gauthier et al, 2007;Möller et al, 2009;Alvarez and Chen, 2014;Chávez et al, 2014). In this equation of state, the interaction coefficients between H 2 and hydrocarbons d H j that have been studied by some scholars (Tsonopoulos and Heidman, 1986;Chen et al, 2009;Chávez et al, 2014) are vital for the VLE calculation precision.…”

Section: Modeling With Vlementioning

confidence: 99%

“…Obvious vaporization is observed by measuring the VLE data between H 2 and different kinds of oils (Gauthier et al, 2007;Browning et al, 2014), which reveals that VLE phenomenon is remarkable in an industrial hydrocracking process. Besides, the vaporization factor also plays an important role in this process.…”

Section: Introductionmentioning

confidence: 98%

Development of hydrocracker modeling by incorporation of vapor-liquid equilibrium

Wang¹,

Cheng²

2016

Petroleum Science and Technology

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Vapor-liquid equilibrium by means of Peng-Robinson equation of state was incorporated into the Stangeland hydrocracker model to improve the modeling prediction precision. For this purpose, the modeling parameters such as the rate constant, product distribution, and reaction heat were all estimated by the genetic algorithm on the basis of industrial data. Investigation of the vapor-liquid equilibrium in a hydrocracker indicated that the liquid flow rate decreases significantly along with proceeding of the reaction, and at outlet of the reactor, the mass flow rate found in the vapor phase even exceeds that of the liquid phase. In a hydrocracker consisting of four beds, 77 mol% of the oil is in the vapor phase at outlet of the last stage, while it is only 30 mol% at inlet of the first stage. Analysis of simulations with and without vapor-liquid equilibrium revealed that there are significant differences in bed temperature profiles, liquid flow rates, liquid compositions, and product yields.

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“…In the above equations, the reaction enthalpies were calculated by means of Benson's group contribution method; while all activation energies were directly taken from literature: the hydrogenation and desulfurization activation energies were taken from López García (2000), and the dealkylation activation energies from taken from Gauthier et al (2007) and Danial-Fortain (2010 …”

Section: Full Stochastic Kinetic Modeling Of Hydrotreating and Hydrocmentioning

confidence: 99%

A Review of Kinetic Modeling Methodologies for Complex Processes

Oliveira

Hudebine

Denis

et al. 2016

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

122

113

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-In this paper, kinetic modeling techniques for complex chemical processes are reviewed. After a brief historical overview of chemical kinetics, an overview is given of the theoretical background of kinetic modeling of elementary steps and of multistep reactions. Classic lumping techniques are introduced and analyzed. Two examples of lumped kinetic models (atmospheric gasoil hydrotreating and residue hydroprocessing) developed at IFP Energies nouvelles (IFPEN) are presented. The largest part of this review describes advanced kinetic modeling strategies, in which the molecular detail is retained, i.e. the reactions are represented between molecules or even subdivided into elementary steps. To be able to retain this molecular level throughout the kinetic model and the reactor simulations, several hurdles have to be cleared first: (i) the feedstock needs to be described in terms of molecules, (ii) large reaction networks need to be automatically generated, and (iii) a large number of rate equations with their rate parameters need to be derived. For these three obstacles, molecular reconstruction techniques, deterministic or stochastic network generation programs, and single-event micro-kinetics and/or linear free energy relationships have been applied at IFPEN, as illustrated by several examples of kinetic models for industrial refining processes.Résumé -Une revue de méthodes de modélisation cinétique pour des procédés complexesDans cet article, les techniques de modélisation cinétique des processus chimiques complexes sont examinées. Après un bref aperçu historique de la cinétique chimique, un aperçu des bases théoriques de la modélisation cinétique d'étapes élémentaires et de réactions globales est présenté. Les techniques classiques de regroupement (lumping) sont ensuite présentées et analysées. Deux exemples de modèles cinétiques regroupés (pour l'hydrotraitement de gazole atmosphérique et pour l'hydrotraitement de résidus) développés à IFP Energies nouvelles (IFPEN) sont présentés. La plus grande partie de cette revue décrit des stratégies avancées de modélisation cinétique, dans lesquelles le détail moléculaire est retenu : les réactions entre les molécules sont représentées ou même subdivisées en étapes élémentaires. Pour être en mesure de conserver ce niveau moléculaire à la fois dans le modèle cinétique et dans les simulations de réacteurs, plusieurs obstacles doivent d'abord être éliminés : (i) la charge doit être décrite en termes de molécules, (ii) les grands réseaux réactionnels doivent être générés automatiquement et (iii) un grand nombre d'équations de vitesse avec leurs paramètres de vitesse doit être dérivé. Pour ces trois obstacles, des techniques de reconstruction moléculaire, des programmes de génération de réseaux déterministes ou stochastiques, et des modèles microcinétiques basés sur des événements constitutifs (single events) et/ou des

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Impact of vaporization in a residue hydroconversion process

Cited by 15 publications

References 5 publications

Modeling the Fluid Dynamics of a Commercial Ebullated Bed Hydroprocessor

Modeling the Fluid Dynamics of a Commercial Ebullated Bed Hydroprocessor

Development of hydrocracker modeling by incorporation of vapor-liquid equilibrium

A Review of Kinetic Modeling Methodologies for Complex Processes

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