WERKWIJZE VOOR HET ISOMERISEREN VAN AROMATISCHE C8-KOOLWATERSTOFFEN MET BEHULP VAN EEN PLATINAALUMINIUMOXYDE-HALOGEEN KATALYSATOR.

摘要

Alkyl aromatics are isomerized under isomerizing conditions in the presence of a noble metal/alumina/halogen catalyst and 20-200 p.p.m. by weight of water, said catalyst being periodically regenerated by isolating from the hydrocarbon, removing carbon deposits and contacting under oxidation conditions with an oxygen-containing gas having a water content of at least 3000 p.p.m. by volume of water. Hydrogen at the rate of 2000-10,000 SCF/Bbl may be added to the feed to suppress coke formation. Isomerization conditions specified are pressures of 100-1000 p.s.i.g. temperatures of 850-975 DEG F. and a W.H.S.V. of 0.5-2. The catalyst may be a platinum/alumina/chlorine catalyst. C8 aromatic mixtures may be isomerized to yield o-, m- or p-xylene and/or ethyl benzene.