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Journal of Industrial and Environmental Chemistry | Volume 2
GREEN CHEMISTRY &
TECHNOLOGY
7th International Conference on
J u n e 1 8 - 2 0 , 2 0 1 8 | D u b l i n , I r e l a n d
Angela Koeckritz et al., J Ind Environ Chem 2018, Volume 2 | DOI: 10.4066/2591-7331-C1-002
OXIDATIVE DEHYDROGENATION OF
MENTHOL IN A CONTINUOUS GAS
PHASE PROCESS
Angela Koeckritz1, Anna Kulik1, Katja Neubauer1, Reinhard
Eckelt1 and Johannes Panten2
1University of Rostock, Germany
2Symrise AG, Germany
(-)-Menthone and (+)-isomenthone are used in the fragrance industry in
synthetic peppermint oils and bases. They can be manufactured from
menthol by oxidation with toxic chromic acid or catalytic dehydrogenation
applying copper chromite. Various catalytic reactions for the synthesis of
menthone/isomenthone in the liquid phase are described in the scientific
literature. But froma sustainable point of view, a solventless process using
heterogeneous catalysts would be desirable. In this study, the oxidative
dehydrogenation of (-)-menthol to (-)-menthone and (+)-isomenthone
in a flow reactor in the gas phase was investigated for the first time.
Menthol was placed in a saturator and evaporated by the reactant/carrier
gas of 5 vol% O2/95 vol% Ar. Type of catalysts, reaction temperatures,
feed concentrations, residence times and catalyst amounts were varied.
Best of the catalysts screened was found to be RuMnCe/CeO2 with Ru
contents of 0.5 to 1.0 wt%. A total yield of menthone + isomenthone up to
69% (at 74% total selectivity) was observed.
Angela Koeckritz is a group leader at Leibniz In-
stitute for Catalysis (LIKAT) in Rostock. Her re-
search has long been focusing on catalytic reac-
tions applied to fine chemicals. In particular, di-
verse catalytic oxidations using green oxidants,
isomerisations and hydrogenations in the liquid
and gas phase have been explored, mainly utiliz-
ing heterogeneous catalysts. Renewables such
as fatty acid derivatives, terpenes or carbohy-
drates have served as feedstock. She studied
chemistry and finished her PhD on an issue of
heterocyclic chemistry at Humboldt University
in Berlin in 1985. Then she became scientist in
a research group dealing with phosphorus-con-
taining compounds for pharmaceuticals and
agrochemicals at the Academy of Sciences in
Berlin. Since 1994, catalysis research in the liq-
uid phase was in the focus of her interest during
the work at the Institute for Applied Catalysis
Berlin-Adlershof (ACA). In 2006, this institute
merged with the Institute for Organic Catalysis
Research in Rostock forming LIKAT.
BIOGRAPHY