Multichannel Microreactors for Highly Exothermic Catalytic Process: The Influence of Thermal Conductivity of Reactor Material and of Transport Phenomena Inside the Channels on the Process Efficiency Full article
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Chemical Engineering Journal
ISSN: 1385-8947 , E-ISSN: 1873-3212 |
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| Output data | Year: 2021, Volume: 409, Article number : 128046, Pages count : 13 DOI: 10.1016/j.cej.2020.128046 | ||
| Tags | Multichannel microreactor; Packed-bed channels; Mathematical modeling; Diffusivity; Thermal conductivity; Temperature distribution | ||
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| Affiliations |
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Funding (1)
| 1 | Federal Agency for Scientific Organizations | 0303-2016-0017 |
Abstract:
In order to simulate strongly exothermic catalytic reactions in multichannel microreactors (MCMR), a new three-dimensional (3D) model is proposed. MCMR fabricated as brass disks 10 mm thick, with 250, or 500 parallel 1mm channels are the subjects of experimental testing and modeling in the catalytic oxidation of methanol to formaldehyde. The 3D model incorporates two interconnected computational domains with the heat exchange between them, namely, the catalyst-filled channels and the metal disc. Axial conductivity and diffusivity in the channels, and thermal conductivity of the metal disk are taken into account; the temperature of metal disk Tme is assumed variable. The new approach enabled to explore the influence of parameters on the process performance in various channels across the disk, which led to a correct prediction of the target product yield and of the critical temperature Tmax in the channels. Otherwise, the predicted yields and Tmax values would be overestimated or underestimated. The change in Tme as a result of the reaction heat generation dominates other factors that affect the establishment of Tmax. A generalized diagram provides permissible ranges for performing a strongly exothermic process in MCMR under constraints on the thermal stability of the catalyst, and relates the reaction heat generation to the appropriate metal heat conductivity. The good agreement between simulated and observed results validates the approach and demonstrates the ability of the model to predict temperature, conversion and yield in each specific channel. Current study stimulates further use of the model for design and practical application of MCMR.
Cite:
Ovchinnikova E.V.
, Vernikovskaya N.V.
, Gribovskii A.G.
, Chumachenko V.A.
Multichannel Microreactors for Highly Exothermic Catalytic Process: The Influence of Thermal Conductivity of Reactor Material and of Transport Phenomena Inside the Channels on the Process Efficiency
Chemical Engineering Journal. 2021. V.409. 128046 :1-13. DOI: 10.1016/j.cej.2020.128046 WOS Scopus РИНЦ AN OpenAlex
Multichannel Microreactors for Highly Exothermic Catalytic Process: The Influence of Thermal Conductivity of Reactor Material and of Transport Phenomena Inside the Channels on the Process Efficiency
Chemical Engineering Journal. 2021. V.409. 128046 :1-13. DOI: 10.1016/j.cej.2020.128046 WOS Scopus РИНЦ AN OpenAlex
Dates:
| Submitted: | Jul 23, 2020 |
| Accepted: | Oct 29, 2020 |
| Published online: | Dec 14, 2020 |
| Published print: | Apr 1, 2021 |
Identifiers:
| Web of science: | WOS:000618082400002 |
| Scopus: | 2-s2.0-85098176948 |
| Elibrary: | 45053777 |
| Chemical Abstracts: | 2020:2715074 |
| OpenAlex: | W3113363681 |