Epimerisation of menthol stereoisomers : Kinetic studies of the heterogeneously catalysed menthol production

Titelangaben

Etzold, Bastian ; Jess, Andreas ; Nobis, M.:
Epimerisation of menthol stereoisomers : Kinetic studies of the heterogeneously catalysed menthol production.
In: Catalysis Today. Bd. 140 (2009) Heft 1–2 . - S. 30-36.
ISSN 0920-5861
DOI: https://doi.org/10.1016/j.cattod.2008.07.009

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Abstract

The heterogeneously catalysed epimerisation of neomenthol and isomenthol is a key step in the synthesis of menthol in the Symrise process (formerly know as Haarmann & Reimer process). A reaction model based on the experimentally determined kinetic and thermodynamic parameters was derived for industrial relevant conditions of 150–210 °C and 0.8–7.5 MPa hydrogen pressure. Results of experiments and modelling show a good agreement and thus the derived kinetic parameters can be used for the optimisation of batch slurry processes as well as of continuous fixed bed processes.