Process for the preparation of 6-methylheptanone
AssigneeDegussa AG
InventorsSteffen Krill, Stephan Kretz, Achim Schneider
Life of this patent
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Abstract
A process for the preparation of methylheptanone and corresponding homologous methyl ketones involves the cross-aldolization of acetone with the corresponding aldehyde. The polar catalyst phase is introduced with acetone and an organic auxiliary solvent phase to form a two phase mixture in the presence of hydrogen. The corresponding aldehyde is then added at temperatures between 40° C. and 200° C. The process can be run in a continuous manner with the polar catalyst phase being recyled after regeneration. The use of the non-polar auxiliary solvent(s) increase yield and selectivity.
Claims17
A Process for the preparation of methyl ketones corresponding to the general formula (1)
- wherein x represents a number between 1 and 3 by the reaction of hydrogen, acetone and an aldehyde corresponding to the general formula (2)
- wherein
- x represents a number between 0 and 2 and the broken lines represent in each case olefinic double bonds, comprising reacting the hydrogen, acetone and aldehyde having the general formula 2 in the presence of a catalyst suspension, a polar phase, which contains a suspended heterogeneous hydrogenation catalyst and a dissolved aldolization catalyst containing alkali metal or alkaline earth metal, and an organic solvent which separates itself from the polar catalyst phase to form an organic phase which organic phase substantially comprises non-polar auxiliary solvent and acetone.
Dependencies are inferred from the claim text.