Assessment of micro-structured fixed-bed reactors for highly exothermic gas-phase reactions

Guettel, Robert; Turek, Thomas

doi:10.1016/j.ces.2009.11.002

Cited by 53 publications

(20 citation statements)

References 21 publications

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“…Ge et al [14] performed experiments for the partial oxidation of toluene to benzaldehyde and benzoic acid and showed that the productivity could be doubled by using microreactors instead of fixed-bed reactors. Güttel and Turek [15] demonstrated, through numerical simulations of the partial oxidation of n-butane to MA, that the reactor productivity of millistructured fixed-bed reactors was up to seven times higher than that in conventional multitubular reactors.…”

Section: Introductionmentioning

confidence: 99%

Process Intensification of n‐Butane Oxidation to Maleic Anhydride in a Millistructured Reactor

Hofmann

Turek

2017

Chem Eng & Technol

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Dedicated to Professor Rüdiger Lange on the occasion of his 65th birthdayThe oxidation of n-butane to maleic anhydride over an industrial vanadyl pyrophosphate oxide catalyst was investigated experimentally in millistructured reactors with varying slit widths to investigate the process intensification potential of this reaction. Although the smaller reactor behaved isothermally, even in the presence of high n-butane concentrations, moderate hot spots never exceeding more than 15 K above the salt bath temperature occurred in the larger catalyst channel. After exposure to high n-butane concentrations, a certain amount of catalyst deactivation was observed, which could be partly restored through reoxidation with pure oxygen. The reactor-specific maleic anhydride productivities obtained are much larger than those in conventional multitubular reactors.

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Section: Introductionmentioning

confidence: 99%

Process Intensification of n‐Butane Oxidation to Maleic Anhydride in a Millistructured Reactor

Hofmann

Turek

2017

Chem Eng & Technol

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“…Two different reactor concepts have been introduced: wall coated and packed-bed reactors [5]. Whereas wall coated reactors offer an optimized heat transfer due to the direct contact between reactor wall and catalyst layer, lFBR enable much higher catalyst loadings per reactor volume, the possibility to use commercial catalysts, and an easier exchange of deactivated catalyst [6,7]. A disadvantage often named in conjunction with lFBR is the pressure drop caused by the packed bed.…”

Section: Introductionmentioning

confidence: 99%

Holdup and Pressure Drop in Micro Packed‐Bed Reactors for Fischer‐Tropsch Synthesis

Knobloch

Güttel

Turek

2013

Chemie Ingenieur Technik

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Low-temperature Fischer-Tropsch synthesis was investigated in micro packed-bed reactors. Co/Re/c-Al 2 O 3 catalysts with different particle shapes and sizes (60 to 580 lm) were employed. Tubular reactor geometry with lengths of up to 1 m was chosen. Pressure drop measurements in the absence of reaction and during reaction were carried out. For analysis of the experimental data a reactor model was developed, which was also used for the determination of liquid holdup. It could be observed that the liquid holdup is independent of conversion, reaction temperature, C 5+ productivity, and reaction rate. For irregularly shaped catalyst particles, a liquid holdup in the range of 3 % was observed.

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“…One way of addressing the mixing challenge is to use a packed bed, also termed a micro-packed bed (µPB) [34][35][36]. This approach also facilitates an increase in the surface area-to-volume ratio, which is useful if the particles within the bed are to act as an adsorbent or catalyst [37][38][39][40].…”

Section: Introductionmentioning

confidence: 99%

Explicit numerical simulation-based study of the hydrodynamics of micro-packed beds

Kashani

Elekaei

Živković

et al. 2016

Chemical Engineering Science

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Knowledge of the hydrodynamic character of micro-packed beds (µPBs) is critical to understanding pumping power requirements and their performance in various applications, including those where heat and mass transfer are involved. The report here details use of smoothed particle hydrodynamics (SPH) based simulation of fluid flow on models of µPBs derived from X-ray microtomography to predict the hydrodynamic character of the beds as a function of the bed-to-particle diameter ratio over the range 5.2 ≤ ≤ 15.1 ⁄ . It is shown that the permeability of the µPBs decreases in a non-linear but monotonic manner with this ratio to a plateau beyond ⁄ ≈ 10 that corresponded to the value predicted by the Ergun equation. This permeability variation was best represented by the model of Reichelt (Chem.Ing. Technik, 44, 1068Technik, 44, , 1972 and also reasonably well-represented by that of Foumeny (Intnl. Transfer, 36, 536, 1993), both of which were developed using macroscale packed beds of varying bed-to-particle diameter ratios. Four other similarly determined correlations did not match well the permeability variation predicted by SPH. The flow field within the µPBs varied in an oscillatory manner with radial position (i.e. channelling occurred at multiple radial positions) due to a similar variation in the porosity. This suggests that use of performance models (e.g. for heat and mass transfer) derived for macroscale beds may not be suitable for µPBs. The SPH-based approach here may well form a suitable basis for predicting such behaviour, however. J. Heat Mass

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Assessment of micro-structured fixed-bed reactors for highly exothermic gas-phase reactions

Cited by 53 publications

References 21 publications

Process Intensification of n‐Butane Oxidation to Maleic Anhydride in a Millistructured Reactor

Process Intensification of n‐Butane Oxidation to Maleic Anhydride in a Millistructured Reactor

Holdup and Pressure Drop in Micro Packed‐Bed Reactors for Fischer‐Tropsch Synthesis

Explicit numerical simulation-based study of the hydrodynamics of micro-packed beds

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