Title: Catalyst for disproportionation of toluene

Abstract: Disproportionation of toluene to produce benzene and xylenes rich in the para isomer is accomplished by subjecting toluene to disproportionation conditions in the presence of a catalyst comprising a crystalline aluminosilicate zeolite, said zeolite having a silica to alumina ratio of at least about 12 and a constraint index, as hereinafter defined, within the approximate range of 1 to 12, said catalyst having been modified by initial treatment with an ammonium phosphate followed by treatment with a magnesium compound to yield a composite containing a minor proportion of an oxide of phosphorus and a minor proportion of an oxide of magnesium.

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Inventors: Chu, Chin-Chiun (South Plainfield, NJ, US)

Application Number: 820192
Filing Date: 1977-07-29
Publication_date: 1979-01-30
Assignee: Mobil Oil Corporation (New York, NY)
Primary Class(es): 502/77
Other Classes:
US Patent Ref:

3972832	Aug, 1976	Butter et al.	252/455.
3974233	Aug, 1976	Lawrenson	252/437.
4049573	Sep, 1977	Kaeding	252/455.

Other Refs:
Primary Examiner: Dees, Carl
Assistant Examiner:
Attorney: Huggett; Charles A., Barclay; Raymond W.