Toluene disproportionation with a surface dealuminated zeolite

Details Toluene disproportionation with a surface dealuminated zeolite Toluene disproportionation with a surface dealuminated zeolite

1985-02-19

1987-06-30

Doll, John

Chemistry of hydrocarbon compounds

Aromatic compound synthesis

By alkyl or aryl transfer between molecules, e.g.,...

585470, C07C 552

Patent

active

046772391

ABSTRACT:
Selective and controlled dealumination of an aluminosilicate zeolite is achieved by filling the pore system of the zeolite with a foreign material, for example coke, removing part of the foreign material from the outer portion of the zeolite, for example by heating in a gas stream comprising oxygen, dealuminating the outer portion, and then removing the remainder of the foreign material. Use of such a partially dealuminated zeolite as catalyst in a toluene disproportionation reaction leads to greater selectivity to paraxylene.

REFERENCES:
patent: 4127616 (1978-11-01), Rodewald
patent: 4148713 (1979-04-01), Rollmann
patent: 4533533 (1985-08-01), Dewing et al.

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