Kinetics of catalytic hydrogenation of -ionone and application of a presaturated one-liquid flow reactor for the production of fine chemicals

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Peter, Steffen ; Datsevich, Leonid ; Jess, Andreas:
Kinetics of catalytic hydrogenation of -ionone and application of a presaturated one-liquid flow reactor for the production of fine chemicals.
In: Applied Catalysis A: General. Bd. 286 (2005) Heft 1 . - S. 96-110.
ISSN 0926-860X
DOI: https://doi.org/10.1016/j.apcata.2005.03.010

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Abstract

Fine chemicals are commonly produced in batch or semibatch reactors, which are frequently operated on a rather limited basis with respect to the knowledge of the kinetics. A typical example is the hydrogenation of the flavor-substance β -ionone. The previously unknown kinetics were studied under industrially relevant conditions (180–230  ° C, 5–90 bar, Raney-Ni). The conversion of the triple-unsaturated β -ionone up to complete hydrogenation proceeds via a network of three parallel and four consecutive reactions. The kinetic parameters were determined, including the influence of external and particularly internal diffusion. Furthermore, the applicability of the presaturated one-liquid flow (POLF) reactor was studied. In this steady-state system, the liquid is externally presaturated with hydrogen, and then fed into a fixed-bed reactor. This leads to a simple – e.g. with respect to scale-up – two-phase system (liquid and solid catalyst) compared to common three-phase batch reactors (and also to “steady-state alternatives” like a trickle bed). For the given reaction, a liquid recycle is installed to compensate the low hydrogen-solubility. Results of experiments and modelling show the good applicability of the POLF-reactor with respect to temperature control, required reactor size, and the inherent advantages of a steady-state process.