Synthesis of liquid menthol by hydrogenation of dementholized peppermint oil over Ni catalysts

Hydrogenation of (-)-menthone and (+)-isomenthone was studied at 2.7 MPa and 100 ºC. The objective was to produce a liquid menthol mixture rich in (-)-menthol from dementholized peppermint oil. Ni-based catalysts were tested and compared for this reaction: a) 6 and 12% Ni dispersed into a nonstoichi...

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Bibliographic Details
Published in:Química Nova 2010, Vol.33 (6), p.1231-1234
Main Authors: Manuale, Debora L., Betti, Carolina, Marchi, Alberto J., Yori, Juan C., Romeo, Eva
Format: Article
Language:English
Subjects:
CHEMISTRY, MULTIDISCIPLINARY
liquid menthol
Ni catalysts
selective hydrogenation
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Summary:Hydrogenation of (-)-menthone and (+)-isomenthone was studied at 2.7 MPa and 100 ºC. The objective was to produce a liquid menthol mixture rich in (-)-menthol from dementholized peppermint oil. Ni-based catalysts were tested and compared for this reaction: a) 6 and 12% Ni dispersed into a nonstoichiometric magnesium aluminate (Ni-Mg-Al) with spinel structure; b) Ni-Raney catalyst. Both types of catalysts were active for (-)-menthone and (+)-isomenthone hydrogenation. Lower conversion but higher selectivity to (-)-menthol was obtained with Ni-Mg-Al catalysts. However, they rapidly lost their activity. Instead Ni-Raney catalysts kept its original activity even after several hydrogenation runs.
ISSN:0100-4042
1678-7064
1678-7064
DOI:10.1590/S0100-40422010000600002