Dismutation and/or transalkylation of alkylaromatic hydrocarbons

Details Dismutation and/or transalkylation of alkylaromatic hydrocarbons Dismutation and/or transalkylation of alkylaromatic hydrocarbons

1998-11-05

2000-03-14

Wood, Elizabeth D.

Chemistry of hydrocarbon compounds

Aromatic compound synthesis

By condensation of entire molecules or entire hydrocarbyl...

585452, 585453, 585467, C07C 264, C07C 266

Patent

active

060375124

ABSTRACT:
The invention concerns the use of a catalyst for the dismutation of alkylaromatic hydrocarbons, and preferably for the dismutation of toluene to produce benzene and xylenes, and/or for the transalkylation of alkylaromatic hydrocarbons, preferably for the transalkylation of toluene and trimethylbenzenes to produce xylenes. The catalyst comprises a zeolite with structure type mazzite, comprising silicon and at least one element T selected from the group formed by gallium and aluminium, preferably aluminium, in which the number of extra-network T atoms is less than 15% of the global number of T atoms present in the zeolite, in which the global Si/T aromatic ratio is in the range 5 to 100, and its preparation by extraction of element T from the zeolitic framework, preferably by dealuminization of the framework by means of at least one hydrothermal treatment followed by at least one acid attack.

REFERENCES:
patent: 4780436 (1988-10-01), Raatz et al.
patent: 5371311 (1994-12-01), Nair et al.
patent: 5391528 (1995-02-01), Benazzi et al.
patent: 5451391 (1995-09-01), Di Renzo et al.
patent: 5773678 (1998-06-01), Benazzi et al.
patent: 5789641 (1998-08-01), Alario et al.

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