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- W2074896845 abstract "The thermal cracking of phenol and ortho and para-cresol at atmospheric pressure, between 665°C and 865°C has been studied with a contact time of 2·5 seconds. 14C- and 3H-labelled substrates have been used in mechanistic studies of these processes. Elimination of one carbon monoxide produced quasi-exclusively by loss of the carbon of the hydroxyl function of the phenols is the first step and leads to the formation of cyclopentadiene or of a C5H6 compound. A condensation of two phenol molecules with loss of water and hydrogen to form dibenzofuran occurs simultaneously. The formation mechanism of this last compound is different according to the cracking temperatures. On a étudié le craquage thermique du phénol et des ortho et para-crésols à pression atmosphérique, entre 665°C et 865°C pour un temps de séjour de 2·5 secondes. L'utilisation de molécules de phénol et de crésols marquées spécifiquement en 14C et 3H, a permis de comprendre le mécanisme primaire. Le mécanisme primaire est l'élimination d'une molécule de monoxyde de carbone. La formation de celui-ci se produit quasi exclusivement au départ du carbone porteur de la fonction hydroxyle des phénols et conduit à la formation de cyclopentadiène ou d'un dérivé en C5H6. Simultanément à cette réaction, il se produit une condensation de deux molécules de phénol avec perte d'une molécule d'eau et d'hydrogène pour former le dibenzofuranne. Le mécanisme de formation de ce produit est différent selon les températures de craquage." @default.
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- W2074896845 date "1974-01-01" @default.
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- W2074896845 title "Mecanismes de fragmentation pyrolytique du phenol et des cresols" @default.
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- W2074896845 doi "https://doi.org/10.1016/s0040-4020(01)97298-9" @default.
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