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US 6,664,423 B2Granted
Two-phase ammoximation
AssigneeDegussa AG
InventorsJuergen Herwig, Stefan Leininger, Georg Oenbrink, Thomas Schiffer
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Abstract
Oximes are prepared from ketones or aldehydes, hydrogen peroxide and ammonia. The reaction is carried out in a system of one aqueous phase and one phase of hydrocarbons inert under the reaction conditions in the presence of at least one interphase contactor and a catalyst system which consists of at least two components. A first component of the catalyst system is present in heterogeneous form and is based on titanium, silicon and oxygen and a second component is a homogeneously dissolved or suspended ammonium salt.
Claims20
A process for preparing an oxime, comprising:
- reacting a ketone or an aldehyde with hydrogen peroxide and ammonia in a system of one aqueous phase and one phase consisting of a hydrocarbon inert under the reaction conditions, in the presence of a catalyst system which comprises at least two components;
- and
- wherein a first component of the catalyst system is present in heterogeneous form and is based on titanium, silicon and oxygen;
- and
- wherein a second component is a homogeneously dissolved or suspended ammonium salt;
- and
- wherein at least one interphase contactor is present.
4 more elements
Dependencies are inferred from the claim text.