Partial wetting of cylindrical catalytic carriers in trickle‐bed reactors

Tsamatsoulis, D.; Papayannakos, N.

doi:10.1002/aic.690420707

Cited by 12 publications

(5 citation statements)

References 22 publications

(34 reference statements)

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“…From existing experimental data in the same reactor and corresponding experimental conditions [13,14], it is estimated that the minimum holdup in the system of this work is 0.5. By using this lowest expected value for liquid holdup (h L = 0.5), the wetting efficiency of the particle is estimated close to unity [15].…”

Section: Catalyst Wetting Efficiencymentioning

confidence: 99%

“…The next step is to estimate the mass transfer coefficients for the catalyst bed diluted with the particular size of the inert particles. The heterogeneous model that mathematically describes the whole process in the reactor bed is based on the mass balances of the liquid and gas phases, and besides reaction, it takes into account gas-liquid mass transfer effects [14].…”

Section: Deriving External Mass Transfer Coefficientsmentioning

confidence: 99%

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Gas‐Liquid Mass Transfer in a Bench‐Scale Trickle Bed Reactor used for Benzene Hydrogenation

Metaxas¹,

Papayannakos²

2008

Chem Eng & Technol

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The gas-liquid mass transfer coefficients (MTCs) of a trickle bed reactor used for the study of benzene hydrogenation were investigated. The Ni/Al 2 O 3 catalyst bed was diluted with a coarse-grained inert carborundum (SiC) particle catalyst. Gasliquid mass transfer coefficients were estimated by using a heterogeneous model for reactor simulation, incorporating reaction kinetics, vapor-liquid equilibrium, and catalyst particle internal mass transfer apart from gas-liquid interface mass transfer. The effects of liquid axial dispersion and the catalyst wetting efficiency are shown to be negligible. Partial external mass transfer coefficients are correlated with gas superficial velocity, and comparison between them and those obtained from experiments conducted on a bed diluted with fine particles is also presented. On both sides of the gas-liquid interface the hydrogen mass transfer coefficient is higher than the corresponding benzene one and both increase significantly with gas velocity. The gas-side mass transfer limitations appear to be higher in the case of dilution with fine particles. On the liquid side, the mass transfer resistances are higher in the case of dilution with coarse inerts for gas velocities up to 3 · 10 -2 cm/sec, while for higher gas velocities this was inversed and higher mass transfer limitations were obtained for the beds diluted with fine inerts.

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Section: Catalyst Wetting Efficiencymentioning

confidence: 99%

Section: Deriving External Mass Transfer Coefficientsmentioning

confidence: 99%

Gas‐Liquid Mass Transfer in a Bench‐Scale Trickle Bed Reactor used for Benzene Hydrogenation

Metaxas¹,

Papayannakos²

2008

Chem Eng & Technol

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“…Regarding the catalyst wetting efficiency, there are numerous studies published. For its estimation, two experimental methods are widely used: the physical “tracer” method − and the chemical “reaction” method. − There are also mathematical models that derive analytical solutions of the overall catalyst effectiveness factor in a partially wetted catalyst particle. − Generally, a large number of variables, such as catalyst bed configuration, pellet features, physical properties of the liquid, and operating conditions, may have an impact on the catalyst wetting …”

Section: Introductionmentioning

confidence: 99%

“…Dilution of catalyst bed, ,, elevated pressurein particular the high gas density, , and the use of small particles 36 improve catalyst wettability. Llano et al, working with a slightly bigger particle diameter than that used in this work and investigating the effect of superficial liquid mass velocitywhich is the most important factor for accomplishing a fully wetted particle, achieved 100% wetting efficiency in our range of liquid velocities.…”

Section: Introductionmentioning

confidence: 99%

Kinetics and Mass Transfer of Benzene Hydrogenation in a Trickle-Bed Reactor

Metaxas

Papayannakos

2006

Ind. Eng. Chem. Res.

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Liquid-phase catalytic hydrogenation of benzene was studied in a three-phase bench-scale reactor operating in downflow mode at elevated temperatures and pressures. Reaction kinetics and external gas-liquid mass transfer effects for the system used are estimated. A simplified kinetic expression is used to describe intrinsic kinetics. An analytical model for reactor simulation has been employed incorporating vapor-liquid equilibrium, solvent effects, and mass transfer limitations. Gas-and liquid-side mass transfer coefficients are extracted for the range of the gas and liquid feed flow rates employed in this work. A comparison between the mass transfer values estimated in this work and values from correlations and data reported in the literature is presented. Operation in upflow mode is also compared with downflow mode, and the different reactor performance is discussed.

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“…turbulencia lo que garantiza que la distribución de corriente en el reactor sea uniforme [2,[8][9][10][11] .…”

Section: Análisis Teóricounclassified

Caracterización de un reactor electroquímico operando en modo galvanostático para la recuperación de baños agotados de mordentado

Pineda

Hernández

Pérez-Herranz

2015

Ingeniare. Rev. chil. ing.

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En el tratamiento de los baños agotados de mordentado, de las industrias de metalizado de plásticos, se emplean reactores electroquímicos tipo filtro-prensa a escala piloto como medio de recuperación del cromo hexavalente, mediante la oxidación del cromo trivalente sobre un ánodo de plomo. Esta investigación se centró en el estudio de un reactor de tres compartimentos separados, con el objetivo de estudiar su comportamiento operando en modo galvanostático de 4 y 8 A, con soluciones reales de baños de mordentado. Se evaluaron parámetros básicos para el diseño de reactores electroquímicos como son: el rendimiento eléctrico, el grado de conversión alcanzado, la productividad específica y la energía específica consumida, acoplando el reactor electroquímico con uno y dos separadores cerámicos fabricados a 250 kg/cm 2 y 0% de contenido en almidón, obteniéndose un reactor con un desempeño adecuado para el cual se tiene menor tiempo de operación, buena productividad y bajo consumo energético cuando se opera a 8 A.

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Partial wetting of cylindrical catalytic carriers in trickle‐bed reactors

Cited by 12 publications

References 22 publications

Gas‐Liquid Mass Transfer in a Bench‐Scale Trickle Bed Reactor used for Benzene Hydrogenation

Gas‐Liquid Mass Transfer in a Bench‐Scale Trickle Bed Reactor used for Benzene Hydrogenation

Kinetics and Mass Transfer of Benzene Hydrogenation in a Trickle-Bed Reactor

Caracterización de un reactor electroquímico operando en modo galvanostático para la recuperación de baños agotados de mordentado

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