Process for manufacturing a diketone
AssigneeHoffmann-La Roche Inc.
InventorPaul Nosberger
Life of this patent
Estimating the term…
Abstract
A process for the manufacture of ketopantolactone of the formula ##STR1## from pantolactone, which comprises dehydrogenating pantolactone in the presence of a vanadium oxide-containing or molybdenum oxide-containing catalyst with oxygen or an oxygen-containing gas in the gas phase.
Claims13
A process for producing ketopantolactone of the formula ##STR4## from pantolactone of the formula ##STR5## comprising dehydrogenating pantolactone of formula II in the presence of a vanadium oxide- or molybdenum oxide-containing catalyst with oxygen or an oxygen-containing gas while the pantolactone is in the gas phase.
A process for producing ketopantolactone from pantolactone in a reactor vessel charged with a vanadium oxide- or molybdenum oxide-containing catalyst, the process comprising:
- (a) adding oxygen or an oxygen-containing gas to the vessel;
- (b) adding pantalactone to the vessel;
- (c) adjusting the temperature within the reaction vessel so that the pantolactone is in a vapor phase,
- thereby forming ketopantolactone.
A process for producing ketopantolactone from pantolactone in a reactor vessel charged with vanadium pentoxide or a mixture of vanadium pentoxide and molybdenum trioxide on .alpha.-aluminium oxide catalyst, the process comprising:
- (a) adding air to the reaction vessel;
- (b) adding pantolactone to the reaction vessel;
- (c) maintaining the temperature of the process between about 250.degree. C. and about 300.degree. C.,
- thereby dehydrogenating the pantolactone to ketopantolactone.
Dependencies are inferred from the claim text.