Modified trilobe shape for maleic anhydride catalyst
AssigneeHuntsman Petrochemical Corporation
InventorsLarry E. Melde, William A. Smith
Life of this patent
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Abstract
Embodiments of the present invention include improved shaped catalyst structures containing catalytic material comprised of mixed oxides of vanadium and phosphorus and using such shaped catalyst structures for the production of maleic anhydride.
Claims21
A shaped oxidation catalyst structure for the production of maleic anhydride, the shaped structure being characterized by:
- (1) containing catalytic material comprised of mixed oxides of vanadium and phosphorus;
- and
- (2) having a solid cylinder structure, wherein the cylinder structure has a cylinder height and a cylinder radius, and the solid cylinder structure has three void spaces running along the cylinder height to form three lobes, wherein each lobe has a corner that is defined by a lobe radius, wherein the ratio of the cylinder radius over the lobe radius is equal to or less than about 15.
A process for preparing maleic anhydride comprising the step of reacting a hydrocarbon having at least four carbons in a straight chain with a molecular oxygen-containing gas in the presence of a shaped oxidation catalyst structure, the shaped structure being characterized by:
- (1) containing catalytic material comprised of mixed oxides of vanadium and phosphorus;
- and
- (2) having a solid cylinder structure, wherein the cylinder structure has a cylinder height and a cylinder radius, and the solid cylinder structure has three void spaces running along the cylinder height to form three lobes, wherein each lobe has a corner that is defined by a lobe radius, wherein the ratio of the cylinder radius over the lobe radius is equal to or less than about 15.
Maleic anhydride produced by the process of reacting a hydrocarbon having at least four carbons in a straight chain with a molecular oxygen-containing gas in the presence of a shaped oxidation catalyst structure, the shaped structure being characterized by:
- (1) containing catalytic material comprised of mixed oxides of vanadium and phosphorus;
- and
- (2) having a solid cylinder structure, wherein the cylinder structure has a cylinder height and a cylinder radius, and the solid cylinder structure has three void spaces running along the cylinder height to form three lobes, wherein each lobe has a corner that is defined by a lobe radius, wherein the ratio of the cylinder radius over the lobe radius is equal to or less than about 15.
Dependencies are inferred from the claim text.