Selective disproportionation catalyst and process

Details Selective disproportionation catalyst and process Selective disproportionation catalyst and process

2005-03-29

2005-03-29

Griffin, Walter D. (Department: 1764)

Chemistry of hydrocarbon compounds

Aromatic compound synthesis

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

C585S470000, C502S060000, C502S064000, C502S069000, C502S070000, C502S073000, C208S046000

Reexamination Certificate

active

06872865

ABSTRACT:
An improved catalytic composite and process are disclosed for the selective disproportionation of toluene. The process uses a layered composite comprising a catalytically active core which comprises a zeolitic aluminosilicate having a SiO2:Al2O3ratio of 8 to 50 and a relatively inactive protective mantle which preferably comprises boralite. Optionally, the composite is selectively precoked prior to toluene disproportionation. The composite and process provide improved selectivity for the production of paraxylene.

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patent: 5998686 (1999-12-01), Clem et al.
patent: 6150293 (2000-11-01), Verduijn et al.

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