Benzene, toluene and xylene are prepared from mixtures of single ring alkyl aromatic compounds of eight or more carbon atoms concurrently with isomerization of xylenes by mixing xylenes from which at least one isomer has been separated with a mixture of alkyl benzenes of eight and more carbon atoms,...http://www.google.es/patents/US4188282?utm_source=gb-gplus-sharePatente US4188282 - Manufacture of benzene, toluene and xylene
