Catalyst for disproportionation of toluene

Details Catalyst for disproportionation of toluene Catalyst for disproportionation of toluene

1977-07-29

1979-01-30

Dees, Carl

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252455Z, B01J 2714, B01J 2906

Patent

active

041371950

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.

REFERENCES:
patent: 3972832 (1976-08-01), Butter et al.
patent: 3974233 (1976-08-01), Lawrenson
patent: 4049573 (1977-09-01), Kaeding

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