Oxidation of benzoic acids to phenols
AssigneeStamicarbon B.V.
InventorsPaul C. van Geem, Antonius J. J. M. Teunissen
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Abstract
The invention relates to a method for the preparation of a substituted or unsubstituted phenol by oxidation of the corresponding substituted or unsubstituted benzoic acid in the gas phase in the presence of a copper and vanadium and/or silver and lithium and/or sodium and/or magnesium containing catalyst and catalysts therefor. The invention particularly relates to the gas phase oxidation of unsubstituted benzoic acid to unsubstituted phenol.
Claims8
A method for the preparation of a substituted or unsubstitued phenol by the gas phase oxidation of the corresponding substituted or unsubstituted benzoic acid, wherein said oxidation is conducted in the presence of a catalyst system consisting essentially of
- (a) a copper component,
- (b) at least one vanadium or silver component, and
- (c) at least one lithium, sodium or magnesium component
- and wherein the atomic ratios of said respective catalyst components (b) and (c) to copper are as follows:
- (i) vanadium and or silver:copper at most 1:2,
- (ii) lithium and or sodium and or magnesium;
- copper at most 5:1,
- under process conditions wherein there is introduced into said gas phase for each 1 mole portion of said benzoic acid,
- - 100mole portions of water, and
- 0.05-5 mole portions of oxygen with said gas phase having a temperature of 450.degree.-700.degree. K. and a pressure of 50-2000 kPa.
Dependencies are inferred from the claim text.