Catalyst and processes for aromatization
AssigneeChevron U.S.A. Inc.
InventorVijay R. Sampath
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Abstract
The present invention pertains to improved processes and catalysts for aromatization. The processes generally contacting a feed stream comprising a naphtha fraction having a C6 to C8 content with a catalyst pellet composition to form aromatic hydrocarbons. The catalyst pellet composition generally comprises a plurality of cylindrical pellets each pellet comprising a Group VIII metal on a zeolite. The pellets may have (a) a plurality of holes passing through the length of the cylindrical pellets, (b) a dome-shaped top and bottom, and (c) a plurality of semi-circular grooves along the length of the exterior of the cylinder.
Claims20
A process for forming aromatic hydrocarbons from a hydrocarbonaceous feed stream, comprising:
- contacting a feed stream comprising a naphtha fraction having a C6 to C8 content with a catalyst pellet composition effective to form aromatic hydrocarbons by catalytic reforming of the feed stream hydrocarbons;
- and
- providing heat for the catalytic reforming of the feed stream hydrocarbons to form aromatic hydrocarbons;
- wherein a catalyst bed composition for the catalytic reforming comprises a plurality of cylindrical pellets, each pellet comprising a Group VIII metal on L-zeolite wherein the plurality of cylindrical pellets is characterized by:
- (a) a plurality of holes passing through the length of the cylindrical pellets,
- (b) a dome-shaped top and bottom, and
- (c) a plurality of semi-circular grooves along the length of the exterior of the cylinder.
A catalyst bed composition comprising a plurality of cylindrical pellets, each pellet comprising a Group VIII metal on L-zeolite wherein the plurality of cylindrical pellets is characterized by:
- (a) a plurality of holes passing through the length of the cylindrical pellets,
- (b) a dome-shaped top and bottom, and
- (c) a plurality of semi-circular grooves along the length of the exterior of the cylinder.
A catalyst bed composition comprising:
- a plurality of cylindrical platinum FKL catalyst pellets wherein one or more of the plurality of cylindrical platinum FKL catalyst pellets is characterized by:
- (a) seven cylindrical holes passing through the length of the cylindrical pellets wherein one of the seven cylindrical holes is located in the center,
- (b) a dome-shaped top and bottom wherein each of the dome height of the dome-shaped top and the dome-shaped bottom is 12.5 percent or less of the cylinder height of the catalyst pellet irrespective of the dome-shaped top and bottom on the pellet, and
- (c) a plurality of semi-circular grooves along the length of the exterior of the cylinder wherein the diameter of the plurality of semi-circular grooves is within 10% of the diameter of each of the seven cylindrical holes,
- A minimum wall thickness surrounding the plurality of holes is greater than 11 percent of the diameter of the cylindrical catalyst pellet diameter.
Dependencies are inferred from the claim text.