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Production of Benzene by the Hydrodemethylation of Toluene with Carbon‐Supported Potassium Hydride

The hydrodemethylation (HDM) of toluene to benzene is an industrial process performed at elevated temperatures (≈500 °C and higher). Here, it was reported that heating graphite‐supported potassium hydride (KH/C) with toluene under H(2) atmosphere provided benzene already at 125–250 °C. Depending on...

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Autores principales: Chang, Fei, Fedorov, Alexey
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10107743/
https://www.ncbi.nlm.nih.gov/pubmed/36445808
http://dx.doi.org/10.1002/cssc.202202029
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author Chang, Fei
Fedorov, Alexey
author_facet Chang, Fei
Fedorov, Alexey
author_sort Chang, Fei
collection PubMed
description The hydrodemethylation (HDM) of toluene to benzene is an industrial process performed at elevated temperatures (≈500 °C and higher). Here, it was reported that heating graphite‐supported potassium hydride (KH/C) with toluene under H(2) atmosphere provided benzene already at 125–250 °C. Depending on the H(2) pressure, the reaction was either substoichiometric ( ≤11 bar) or catalytic ( ≥50 bar) with respect to KH, indicating that KH may serve as a radical chain initiator. At 250 °C, the selectivity to benzene was 98 and 63 % when using 6 and 80 bar of H(2), respectively, owing to the competing formation of cyclohexane and methylcyclohexane at high H(2) pressure. The used KH/C material was amenable to recycling without a notable loss in the yield of benzene.
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spelling pubmed-101077432023-04-18 Production of Benzene by the Hydrodemethylation of Toluene with Carbon‐Supported Potassium Hydride Chang, Fei Fedorov, Alexey ChemSusChem Research Articles The hydrodemethylation (HDM) of toluene to benzene is an industrial process performed at elevated temperatures (≈500 °C and higher). Here, it was reported that heating graphite‐supported potassium hydride (KH/C) with toluene under H(2) atmosphere provided benzene already at 125–250 °C. Depending on the H(2) pressure, the reaction was either substoichiometric ( ≤11 bar) or catalytic ( ≥50 bar) with respect to KH, indicating that KH may serve as a radical chain initiator. At 250 °C, the selectivity to benzene was 98 and 63 % when using 6 and 80 bar of H(2), respectively, owing to the competing formation of cyclohexane and methylcyclohexane at high H(2) pressure. The used KH/C material was amenable to recycling without a notable loss in the yield of benzene. John Wiley and Sons Inc. 2022-12-12 2023-01-20 /pmc/articles/PMC10107743/ /pubmed/36445808 http://dx.doi.org/10.1002/cssc.202202029 Text en © 2022 The Authors. ChemSusChem published by Wiley-VCH GmbH https://creativecommons.org/licenses/by-nc/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc/4.0/ (https://creativecommons.org/licenses/by-nc/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
spellingShingle Research Articles
Chang, Fei
Fedorov, Alexey
Production of Benzene by the Hydrodemethylation of Toluene with Carbon‐Supported Potassium Hydride
title Production of Benzene by the Hydrodemethylation of Toluene with Carbon‐Supported Potassium Hydride
title_full Production of Benzene by the Hydrodemethylation of Toluene with Carbon‐Supported Potassium Hydride
title_fullStr Production of Benzene by the Hydrodemethylation of Toluene with Carbon‐Supported Potassium Hydride
title_full_unstemmed Production of Benzene by the Hydrodemethylation of Toluene with Carbon‐Supported Potassium Hydride
title_short Production of Benzene by the Hydrodemethylation of Toluene with Carbon‐Supported Potassium Hydride
title_sort production of benzene by the hydrodemethylation of toluene with carbon‐supported potassium hydride
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10107743/
https://www.ncbi.nlm.nih.gov/pubmed/36445808
http://dx.doi.org/10.1002/cssc.202202029
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