Desulfurization process for removal of refractory organosulfur heterocycles from petroleum streams

US5897768A · kind A · utility

Assignee

• Exxon Research and Engineering Company · US

Inventors

• Gary B. McVicker · Califon, US
• Teh C. Ho · Bound Brook, US
• Stuart L. Soled · Pittstown, US
• Michel Daage · Baton Rouge, US
• Roman Krycak · Annandale, US
• Sabato Miseo · Pittstown, US
• Viktor Buchholz · Readington, US
• William E. Lewis · Baton Rouge, US

Key dates

• Filing date: Feb 28, 1997
• Grant date: Apr 27, 1999
• Expiry date: Feb 28, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10G45/04
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

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.