Hydrotreating catalyst composition and processes therefor and th

Details Hydrotreating catalyst composition and processes therefor and th Hydrotreating catalyst composition and processes therefor and th

1996-10-30

1998-09-22

Caldarola, Glenn

Chemistry of hydrocarbon compounds

Aromatic compound synthesis

By dealkylation

585483, 585486, 585488, C07C 418, C07C 412

Patent

active

058116150

ABSTRACT:
A catalyst composition and a process for hydrodealkylating a C.sub.9 + aromatic compound to a C.sub.6 to C.sub.8 aromatic hydrocarbon such as a xylene are disclosed. The composition comprises an alumina and hexavalent chromium oxide. The process comprises contacting a fluid which comprises a C.sub.9 + aromatic compound with the catalyst composition under a condition sufficient to effect the conversion of a C.sub.9 + aromatic compound to a C.sub.6 to C.sub.8 aromatic hydrocarbon. Also disclosed is a process for producing the composition which comprises: (1) contacting an alumina, which can be optionally calcined before being contacted, with a hexavalent chromium-containing compound in a liquid medium under a condition sufficient to incorporate the hexavalent chromium-containing compound into the alumina to form a chromium-modified alumina wherein the volume of the liquid medium is larger than the bulk volume of alumina; (2) removing the excess liquid medium containing the hexavalent chromium compound; (3) drying the chromium-modified alumina; and (4) calcining the chromium-modified alumina to a chromium-promoted alumina under a condition sufficient to effect the conversion of the hexavalent chromium compound to corresponding chromium oxide.

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