Patent ID: 6822129
Filing Date: 2004-11-23
Classification: B01J,C07C

Abstract:
A method for isomerizing aromatic compounds, which comprises contacting at least one aromatic compound with a zeolite-containing catalyst having a pore structure of controlled diameter, said zeolite being characterized in that:(1) when said pore aperture has a circular or a non-circular cross section and accordingly has a minimum diameter and a maximum diameter, the minimum value of the pore aperture diameter of the major channels therein is larger than 0.65 nanometers, and the maximum value thereof is larger than 0.70 nanometers, (2) said major channels do not intersect any others having larger apertures than an oxygen 10-membered ring, and (3) said zeolite has a crystal size of at most 1 &mgr;m; and wherein said aromatic compounds are selected from the group consisting of:(a) aromatic compounds having at least three substituents, (b) aromatic compounds having two substituents of which at least one is a halogen or has at least 2 carbon atoms, and (c) naphthalene or anthracene derivatives having substituent(s).