Raney-nickel catalyzed hydrogenations: Gas-liquid mass transfer in gas-induced stirred slurry reactors

Dietrich, E.; Mathieu, C.; Delmas, Henri; Jenck, J.

doi:10.1016/0009-2509(92)85075-m

Cited by 76 publications

(73 citation statements)

References 25 publications

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“…Taking into account that the density and surface tension of the liquid phase are practically constant between 0.3 and 1.1 MPa, the gas-liquid mass transfer coefficient can be considered constant. 2 The increase of external mass transfer resistance may be caused by changes of the hydrodynamics patterns due to the increase of pressure. Figure 7 summarizes the separated mass transfer resistances with respect to agitation speed.…”

Section: Separation Of Mass Transfer Resistancesmentioning

confidence: 99%

“…Each of the mass transfer processes and the intrinsic reaction rate affect the overall process rate in different extent. 1,2 The design of three phase reactors requires the determination of the mass transfer coefficients and the reaction rate constant. The determination of mass transfer coefficients becomes even more important when the reaction rate constant and external mass transfer is of comparable magnitude.…”

Section: Introductionmentioning

confidence: 99%

“…The gas-liquid mass transfer coefficient is usually determined using the dynamic physical absorption method. 2,3,7,8 Cordova and Harriott 9 and Gholap et al 10 calculated gas-liquid mass transfer coefficient and the liquid-solid mass transfer coefficient by changing catalyst loading and using different size of catalyst particle under reaction conditions. The drawback of varying catalyst size is the requirement of shell type catalyst to ensure interparticle diffusion does not depend on catalyst size.…”

Section: Introductionmentioning

confidence: 99%

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Determination of mass transfer resistances of fast reactions in three‐phase mechanically agitated slurry reactors

Stamatiou

Muller

2016

AIChE Journal

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A methodology for the determination of mass transfer resistances of fast reactions in three-phase mechanically agitated slurry reactors under the reaction conditions is presented. The mass transfer resistances affect significantly the overall mass transfer rate, the design equation and consequently the scale up of the reactor. There is not established methodology to separate the mass transfer resistances under reaction conditions by changing catalyst loading and manipulating the process variables, pressure and agitation speed. This allows to avoid the use of different catalyst particles and give the chance to calculate the mass transfer resistances without caring about the type of catalyst. We calculate each mass transfer resistance under conditions which do not allow to neglect any of the resistances. It is shown that the level off of mass transfer rate which is developed in the plot of mass transfer rate against agitation speed plots is not enough to determine the limiting regime. The hydrogenation of styrene over Pd/C (5% catalyst content) is used as case study to demonstrate the methodology.

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Section: Separation Of Mass Transfer Resistancesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Determination of mass transfer resistances of fast reactions in three‐phase mechanically agitated slurry reactors

Stamatiou

Muller

2016

AIChE Journal

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“…The method of k GL a GL coefficient measurement by batch absorption of gas in liquid is well-described by Dietrich et al [16]. The experiments consisted in measuring the hydrogen transfer into methylcyclohexane (180 mL).…”

Section: Methodsmentioning

confidence: 99%

A New Concept of Stirred Multiphase Reactor Using a Stationary Catalytic Foam

et al. 2018

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Abstract:Developing new stirred gas-liquid-solid reactors with high mass transfer capabilities is still a challenge. In this publication, we present a new concept of multiphase reactor using a stationary catalytic foam and a gas-inducing impeller. The gas-liquid (GL) and liquid-solid (LS) mass transfer rates in this reactor were compared to a stirred reactor with basket filled with beads. Batch absorption of hydrogen and measurement of α-methylstyrene hydrogenation rate on Pd/Al 2 O 3 catalyst were used to evaluate k GL a GL coefficients and k LS coefficients, respectively. With similar LS transfer rates to the basket-reactor and much higher GL transfer rates, the new reactor reveals a very promising tool for intrinsic kinetics investigations.

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“…G-L mass transfer enhancement was observed when fine solid particles are present at the G-L interface (Alper et al, 1980;Alper and Öztürk, 1986;Wimmers and Fortuin, 1988;Drinkenburg, 1992, 1995;Beenackers and van Swaaij, 1993;Joly-Vuillemin et al, 1996;van der Zon et al, 1999). The adhesion of catalyst particles to gas bubbles plays a key role in the mass transfer mechanism for the oxidation of organic compounds (Lee and Tsao, 1972;Alper et al, 1980;Lavelle and McMonagle, 2001) or hydrogenation reactions in aqueous media (Wimmers et al, 1988;Dietrich et al, 1992;Vinke et al, 1992;van der Zon et al, 1999). However, the nature of this influence is still subject of debate.…”

Section: Introductionmentioning

confidence: 99%