Equilibration of lower alkyl substituted polyalkyl aromatic hydrocarbons with reduced disproportionation
AssigneeChevron Research Company
InventorJohn J. Brodbeck
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Abstract
Disproportionation losses in the isomerization of C.sub.8 aromatic hydrocarbons are reduced by the use of silica-alumina catalyst composites with high surface areas and having [pore] most of its pore volume from pores of radii [in the main] above about 45.degree. A.
Claims9
The process for the catalytic isomerization of an alkyl substituted polyalkyl aromatic hydrocarbon feed which comprises contacting the feed with a silica-alumina isomerization catalyst at a temperature in the range from about 700.degree. F. to 1000.degree. F., at a liquid hourly space velocity in the range from about 0.1 to 10, and at a pressure below about 200 p.s.i.g., wherein said catalyst consists essentially of a silica and alumina composite having a surface area in the range from about 250 to 400 square meters per gram, wherein at least 40 percent of the catalyst pore volume is from pores [have] having a radius greater than about 45 A., said feed having an aromatic carbocyclic carbon atom content below about 13, and having from 2 to about 4 of the same or different lower alkyl substituent groups;
- and said composite having a silica to alumina weight ratio in the range from about 70-90 to about 10-30, respectively.
Dependencies are inferred from the claim text.