Volatile tracer dispersion in multi-phase packed beds

Márquez, Nathalie; Musterd, Michiel; Castaño, Pedro; Berger, Rob J.; Moulijn, Jacob A.; Makkee, Michiel; Kreutzer, Michiel T.

doi:10.1016/j.ces.2010.03.031

Cited by 8 publications

(8 citation statements)

References 31 publications

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“…High temperatures and a nonpolar reaction medium make identification of a suitable tracer difficult. While volatile tracers have been utilized for small scale RTD analysis, 26 partitioning of the tracer between the gas and liquid phase complicates analysis. Squalane, a heavy C 30 hydrocarbon, was considered to be a nonvolatile and thus useful probe for the liquid phase RTD.…”

Section: Resultsmentioning

confidence: 99%

“…With those assumptions, the plug flow reactor mass balances take the form similar to a reactive distillation model. 26 Liquid phase:…”

Section: Computational Modelingmentioning

confidence: 99%

“…(See the Supporting Information for further details). With those assumptions, the plug flow reactor mass balances take the form similar to a reactive distillation model Liquid phase: U l φ normald C A , l normald z = prefix− k C A , l C B , l + false( k a false) g l ( 1 H d , A C A , g − C A , l ) U l φ normald C B , l normald z = prefix− k C A , l C B , l + false( k a false) g l ( 1 H d , B C B , g − C B , l ) Vapor phase: …”

Section: Computational Modelingmentioning

confidence: 99%

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Continuous Thermal Oxidation of Alkenes with Nitrous Oxide in a Packed Bed Reactor

Newman

Lee

Cai

et al. 2014

Ind. Eng. Chem. Res.

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The reaction of nitrous oxide with internal olefins is investigated in a flow reactor. When using a mixture of dodecene isomers, ketones are formed as the primary product with conversions up to 77% and yields up to 45%. The multiphase system is studied experimentally and computationally to gain understanding of the residence time distribution and phase composition. Significant volatility of the dodecenes and solubility of the nitrous oxide result in a system where reaction occurs in both the vapor and liquid at elevated temperatures. The rate constant for oxidation with nitrous oxide is determined by considering both phases and the material transfer between them using 16 different physical parameters through nonlinear optimization. The determined rate constant is in good agreement with parameters estimated by quantum chemistry calculations.

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Section: Resultsmentioning

confidence: 99%

“…With those assumptions, the plug flow reactor mass balances take the form similar to a reactive distillation model. 26 Liquid phase:…”

Section: Computational Modelingmentioning

confidence: 99%

Section: Computational Modelingmentioning

confidence: 99%

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Continuous Thermal Oxidation of Alkenes with Nitrous Oxide in a Packed Bed Reactor

Newman

Lee

Cai

et al. 2014

Ind. Eng. Chem. Res.

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“…45 At the same time, the channelling effect of gas within the micro-packed bed can lead to a serious by-passing of volatile species within the liquid medium. 46 Fig. 5b corresponds to micro-fluidic design 1 with a five times larger PEG-flow-rate in the 5.5 mm-width bed.…”

Section: Designmentioning

confidence: 99%

Tailoring the multiphase flow pattern of gas and liquid through micro-packed bed of pillars

et al. 2019

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“…Another option is to scale microreactors up to the range of milli-reactors (with reactor inner diameters in the order of tens of millimeters) . In both cases, when the catalyst particles are smaller than ∼500 μm, the hydrodynamics are usually dominated by viscous stress and interfacial tension at the liquid–gas boundary rather than by gravity and inertial forces. , Larger scale packed-bed reactors in which the catalyst pellets are about 1–3 mm, generally known as trickle-bed reactors, have semiempirical equations that are commonly used for design purposes . However, the inherent packing randomness combined with the strong capillary and viscous forces in micropacked-bed reactors preclude the use of simple and accurate modeling equations to predict mass-transfer coefficients under different conditions.…”

Section: Introductionmentioning

confidence: 99%

Modeling Pore-Scale Two-Phase Flow: How to Avoid Gas-Channeling Phenomena in Micropacked-Bed Reactors via Catalyst Wettability Modification

Navarro-Brull

Gómez

2017

Ind. Eng. Chem. Res.

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A model for the design of micropacked-bed reactors via correlations, capable of providing a reliable estimation of two-phase flow dynamics and mass-transfer coefficients, is lacking, especially when the particle size of the bed is around 100 μm. In this work, we present a validation of the use of the phase-field method for reproducing two-phase flow experiments found in the literature. This numerical simulation strategy sheds light on the impact of the micropacked-bed geometry and wettability on the formation of preferential gas channels.Counter-intuitively, to homogenize the two-phase flow hydrodynamics and reduce radial masstransfer limitations, solvent wettability of the support needs to be restricted -showing best performance when the contact angle ranges 60º and capillary forces are still dominant. The tuning of gas-liquid-solid interactions by surface wettability modification opens a new window of opportunity for the design and scale-up of micropacked-bed reactors.2

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Volatile tracer dispersion in multi-phase packed beds

Cited by 8 publications

References 31 publications

Continuous Thermal Oxidation of Alkenes with Nitrous Oxide in a Packed Bed Reactor

Continuous Thermal Oxidation of Alkenes with Nitrous Oxide in a Packed Bed Reactor

Tailoring the multiphase flow pattern of gas and liquid through micro-packed bed of pillars

Modeling Pore-Scale Two-Phase Flow: How to Avoid Gas-Channeling Phenomena in Micropacked-Bed Reactors via Catalyst Wettability Modification

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