Mobil Oil Corporation

Frederick Banta

Robert C Wilson, Jr

Thomas R Stein

Donald Milstein

Henry R Ireland

Alan W Peters

A process is described for hydrotreating residual oil fractions in an improved dual bed catalyst system comprising a first large-pore catalyst and a second small-pore catalyst in which at least the second catalyst and preferably both catalysts have a quadrulobal shape. Using cobalt and molybdenum composited on alumina as these catalysts, residua are demetalized, desulfurized, and reduced in carbon residue, whereby hitherto unusable residue can be hydroprocessed.

Demetalation, desulfurization, and decarbonization of petroleum oils by

Cyclic hydrotreating of resids with low pressure, short term on-stream periods yields desirable products.

Low pressure hydrotreating of residual fractions

A method is disclosed for the improvement of catalyst performance in catalytic hydrodewaxing of both petroleum and synthetic hydrocarbon feedstocks utilizing a special group of acidic crystalline aluminosilicate zeolites such as those of the ZSM-5 type which involves treatment of said zeolites in order to adjust their initially high alpha activity to within a range of 55-150 alpha prior to use as catalysts in a hydrodewaxing operation.

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Elmer, NJ, United States of America

Frederick Banta