Numbered-up gas–liquid micro/milli channels reactor with modular flow distributor

Al-Rawashdeh, Ma’moun; Yu, Fengqi; Nijhuis, T.A.; Rebrov, Evgeny V.; Hessel, Volker; Schouten, J.C.

doi:10.1016/j.cej.2012.07.028

Cited by 103 publications

(70 citation statements)

References 50 publications

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“…Moreover, a larger scale production can be achieved using either the numbering-up approach connecting the catalyst-coated reactors in parallel [65,66], or even in series made possible by the low pressure drop. …”

Section: Effect Of Liquid Flow Ratesmentioning

confidence: 99%

Process Intensification of Alkynol Semihydrogenation in a Tube Reactor Coated with a Pd/ZnO Catalyst

2017

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Semihydrogenation of 2-methyl-3-butyn-2-ol (MBY) was studied in a 5 m tube reactor wall-coated with a 5 wt % Pd/ZnO catalyst. The system allowed for the excellent selectivity towards the intermediate alkene of 97.8 ± 0.2% at an ambient H 2 pressure and a MBY conversion below 90%. The maximum alkene yield reached 94.6% under solvent-free conditions and 96.0% in a 30 vol % MBY aqueous solution. The reactor stability was studied for 80 h on stream with a deactivation rate of only 0.07% per hour. Such a low deactivation rate provides a continuous operation of one month with only a two-fold decrease in catalyst activity and a metal leaching below 1 parts per billion (ppb). The excellent turn-over numbers (TON) of above 10 5 illustrates a very efficient utilisation of the noble metal inside catalyst-coated tube reactors. When compared to batch operation at 70 • C, the reaction rate in flow reactor can be increased by eight times at a higher reaction temperature, keeping the same product decomposition of about 1% in both cases.

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Section: Effect Of Liquid Flow Ratesmentioning

confidence: 99%

Process Intensification of Alkynol Semihydrogenation in a Tube Reactor Coated with a Pd/ZnO Catalyst

2017

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“…The exact number of microchannels depends on the maximum allowed pressure drop over the reactor and the channel length which is often limited by available microfabrication methods [49][50][51][52]. Therefore the numbering up approach needs to be combined with scaling up of the reactor dimensions to bring the throughput to the industrial scale while avoiding mass or heat transfer limitations.…”

Section: Introductionmentioning

confidence: 99%

Scale up study of capillary microreactors in solvent-free semihydrogenation of 2‐methyl‐3‐butyn‐2‐ol

Cherkasov

Al-Rawashdeh²,

Ibhadon

et al. 2016

Catalysis Today

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warwick.ac.uk/lib-publicationsOriginal citation: Cherkasov, Nikolay, Al-Rawashdeh, Ma 'moun, Ibhadon, Alex O. and Rebrov, Evgeny V.. (2016) Scale up study of capillary microreactors in solvent-free semihydrogenation of 2-methyl-3-butyn-2-ol. Catalysis Today, 273 . pp. 205-212. Permanent WRAP URL:http://wrap.warwick.ac.uk/78678 Copyright and reuse:The Warwick Research Archive Portal (WRAP) makes this work by researchers of the University of Warwick available open access under the following conditions. Copyright © and all moral rights to the version of the paper presented here belong to the individual author(s) and/or other copyright owners. To the extent reasonable and practicable the material made available in WRAP has been checked for eligibility before being made available.Copies of full items can be used for personal research or study, educational, or not-for-profit purposes without prior permission or charge. Provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. A note on versions:The version presented here may differ from the published version or, version of record, if you wish to cite this item you are advised to consult the publisher's version. Please see the 'permanent WRAP url' above for details on accessing the published version and note that access may require a subscription. Keywords: Semihydrogenation; catalytic coatings; microreactor; Palladium; alkynol; acetylene. Highlights:-Capillary reactors with a diameter of 0.53 and 1.6 mm were coated with a Pd/ZnO catalyst -The alkene selectivity above 97% was obtained in the hydrogenation of 2-methyl-3-butyn-2-ol -At a coating thickness of 6 µm, the onset of internal diffusion limitations was observed -A throughput of 28 kg/day per coated channel can be reached according to the reaction kinetics Graphical abstract:

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“…The best literature data reports a throughput of 0.13 kg gpt −1 day −1 being obtained under much higher temperature and pressure [31,35]. There exists a possibility for further scale up to a 10 kg gpt −1 day −1 by operating 32 tubes in parallel following the numbering up approach in a gas-liquid modular manifold [63,64]. A very low-pressure drop in the catalyst-coated tube reactor also allows increasing the reactor length by connecting the reactors in series.…”

Section: Long-term Stabilitymentioning

confidence: 99%

Highly Selective Continuous Flow Hydrogenation of Cinnamaldehyde to Cinnamyl Alcohol in a Pt/SiO2 Coated Tube Reactor

et al. 2018

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A novel continuous flow process for selective hydrogenation of α, β-unsaturated aldehyde (cinnamaldehyde, CAL) to the unsaturated alcohol (cinnamyl alcohol, COL) has been reported in a tube reactor coated with a Pt/SiO 2 catalyst. A 90% selectivity towards the unsaturated alcohol was obtained at the aldehyde conversion of 98.8%. This is a six-fold improvement in the selectivity compared to a batch process where acetals were the main reaction products. The increased selectivity in the tube reactor was caused by the suppression of acid sites responsible for the acetal formation after a short period on stream in the continuous process. In a fixed bed reactor, it had a similar acetal suppression phenomenon but showed lower product selectivity of about 47-72% due to mass transfer limitations. A minor change in selectivity and conversion caused by product inhibition was observed during the 110 h on stream with a turnover number (TON) reaching 3000 and an alcohol production throughput of 0.36 kg g Pt −1 day −1 in the single tube reactor. The catalysts performance after eight reaction cycles was fully restored by calcination in air at 400 • C. The tube reactors provide an opportunity for process intensification by increasing the reaction rates by a factor of 2.5 at the reaction temperature of 150 • C compared to 90 • C with no detrimental effects on catalyst stability or product selectivity.

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Numbered-up gas–liquid micro/milli channels reactor with modular flow distributor

Cited by 103 publications

References 50 publications

Process Intensification of Alkynol Semihydrogenation in a Tube Reactor Coated with a Pd/ZnO Catalyst

Process Intensification of Alkynol Semihydrogenation in a Tube Reactor Coated with a Pd/ZnO Catalyst

Scale up study of capillary microreactors in solvent-free semihydrogenation of 2‐methyl‐3‐butyn‐2‐ol

Highly Selective Continuous Flow Hydrogenation of Cinnamaldehyde to Cinnamyl Alcohol in a Pt/SiO2 Coated Tube Reactor

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