Accurate hydrogenated vegetable oil viscosity predictions for monolith reactor simulations

Albrand, Pierre; Julcour-Lebigue, Carine; Gerbaud, Vincent; Billet, Anne-Marie

doi:10.1016/j.ces.2019.115388

Cited by 6 publications

(17 citation statements)

References 62 publications

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“…Direct blending limitations could not be applied to other fuel properties such as density, viscosity, the concentration of water. In contrast, reductions in density may result in some fuel savings and flexibility in the refinery process [85]. They are safe for storage and transport as renewable diesel flash points are above diesel.…”

Section: Properties and Standards Of Hydrogenated Vegetable Oilmentioning

confidence: 99%

Biodiesel and green diesel generation: an overview

Vignesh¹,

Kumar

Ganesh

et al. 2021

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

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First, second, third, and fourth-generation biofuels are continuously evolving as a promising substitute to petrodiesel catalyzed by energy depletion, economic and environmental considerations. Bio-diesel can be synthesized from various biomass sources, which are commonly divided into FAME and renewable biodiesel. FAME biodiesel is generally produced by the transesterification of vegetable oils and fats while renewable diesel is produced by hydro-deoxygenation of vegetable and waste oils and fats. The different generation, processing technologies and standards for FAME and renewable biodiesel are reviewed. Finally, the life cycle analysis and production cost of conventional and renewable biodiesel are described.

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Section: Properties and Standards Of Hydrogenated Vegetable Oilmentioning

confidence: 99%

Biodiesel and green diesel generation: an overview

Vignesh¹,

Kumar

Ganesh

et al. 2021

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

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“…TAG) diffusivity in oil, 𝜖 𝑝 and 𝜏 𝑝 are the catalyst porosity and tortuosity, respectively. Expressions of 𝐷 𝑖,𝑜𝑖𝑙 for both species in sunflower oil are available in Albrand et al [35] for a given temperature. Porosity was measured at 75% for the same catalyst support [36] and tortuosity was set to 3 as an usual value [37].…”

Section: First Optimization Stepmentioning

confidence: 99%

Sunflower oil hydrogenation mechanisms and kinetics

Albrand

Julcour-Lebigue

Veyrine

et al. 2021

Chemical Engineering Journal

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A kinetic model for sunflower oil hydrogenation on a palladium catalyst is proposed based on Horiuty-Polanyi type mechanism and considering either a dissociative or associative adsorption of hydrogen. The derived kinetic laws allow to explain the distinct dependency of saturation and isomerization reactions on hydrogen pressure.Kinetic parameters are identified based on batch slurry hydrogenations carried out at 60-160 • C and 2-31 bar with a powdered Pd/Al 2 O 3 catalyst. A statistical analysis is used to select the most suitable adsorption mechanism for H 2 . Evaluation of the Weisz-Prater modulus reveals that limitations to intraparticle diffusion occur despite the particle diameter does not exceed 40 μm.

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“…This section focuses on the CFD modeling of the previously described hydrogenation tests in a single channel reactor operating in Taylor flow conditions. Numerical and experimental results aimed to be compared for model validation and process scale-up following the overall strategy described by Albrand et al 23 for heat-exchanger reactors of monolith type.…”

Section: ■ Cfd Modeling Of Sunflower Oil Hydrogenation In Capillary C...mentioning

confidence: 99%

“…13 Ca and Re values usually determine liquid film thickness, slug length, bubble shape, or two-phase pressure drop. 22 In a previous contribution, 23 a simulation strategy of a heat exchanger-monolith reactor was developed for sunflower oil hydrogenation. It described the strong multiphysics coupling between hydrodynamics, transport phenomena (mass transfer), and reaction in the channels, due to the evolution of viscosity and diffusivity during the oil hydrogenation.…”

Section: ■ Introductionmentioning

confidence: 99%

Sunflower Hydrogenation in Taylor Flow Conditions: Experiments and Computational Fluid Dynamics Modeling Using a Moving Mesh Approach

Albrand

Julcour-Lebigue

Billet

2021

Ind. Eng. Chem. Res.

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Sunflower oil hydrogenation was carried out in a 2 mm diameter jacketed capillary reactor coated with a Pd/Al 2 O 3 catalyst, mimicking a channel of a heat exchanger monolith reactor. The operating conditions were chosen to ensure Taylor flow conditions and to evaluate their impact on the reaction selectivity. CFD simulations of the experiments were performed using the unit cell approach. They accounted for the dependence of viscosity on the degree of oil saturation, kinetic laws describing the effects of pressure on cis/trans selectivity, and bubble shrinkage along the channel using a moving mesh strategy. The model captured the experimental trends, in which the fraction of monounsaturated cis fatty acids did not exceed 35% (vs 30% originally). Poor selectivity is mainly due to the strong mass transfer resistance at the catalyst wall, either from fatty acids (favoring their complete saturation) and/or from hydrogen (due to bubble shrinkage, favoring cis to trans isomerization).

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Accurate hydrogenated vegetable oil viscosity predictions for monolith reactor simulations

Cited by 6 publications

References 62 publications

Biodiesel and green diesel generation: an overview

Biodiesel and green diesel generation: an overview

Sunflower oil hydrogenation mechanisms and kinetics

Sunflower Hydrogenation in Taylor Flow Conditions: Experiments and Computational Fluid Dynamics Modeling Using a Moving Mesh Approach

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