초록 ▼

Hydrocarbon feeds are upgraded by contact of the stream under hydrodesulfurization (HDS) conditions with a catalyst system comprising a sulfided, transition metal promoted tungsten/molybdenum HDS catalyst, e.g., Ni/Co--Mo/Al.sub.2 O.sub.3 and a solid acid catalyst which is effective for the isomeriz

Hydrocarbon feeds are upgraded by contact of the stream under hydrodesulfurization (HDS) conditions with a catalyst system comprising a sulfided, transition metal promoted tungsten/molybdenum HDS catalyst, e.g., Ni/Co--Mo/Al.sub.2 O.sub.3 and a solid acid catalyst which is effective for the isomerization/disproportionation/transalkylation of alkyl substituted, condensed ring heterocyclic sulfur compounds present in the feedstream, e.g. zeolite or a heteropolyacid compound. Isomerization, disproportionation and transalkylation reactions convert refractory sulfur compounds such as 4- or 4,6-alkyl dibenzothiophenes into corresponding isomers or disproportionated isomers which can be more readily desulfurized by conventional HDS catalysts to H.sub.2 S and other products.

대표청구항 ▼

[ What is claimed is:] [1.] A process for hydrorefining a hydrotreated hydrocarbon stream containing refractory, stearically hindered, alkyl substituted, condensed ring heterocyclic sulfur compounds comprising contacting said hydrotreated hydrocarbon stream under hydrodesulfurization and isomerizati

[ What is claimed is:] [1.] A process for hydrorefining a hydrotreated hydrocarbon stream containing refractory, stearically hindered, alkyl substituted, condensed ring heterocyclic sulfur compounds comprising contacting said hydrotreated hydrocarbon stream under hydrodesulfurization and isomerization conditions and in the presence of hydrogen with a mixed catalyst system comprising:(a) a hydrodesulfurization catalyst comprising a sulfided molybdenum, tungsten or molybdenum and tungsten catalyst promoted with a transition metal; and(b) a solid acid catalyst effective for the isomerization, transalkylation and a combination of isomerization and transalkylation, of alkyl substituent groups present on said heterocyclic compounds under said hydrodesulfurization conditions.