Janet E Clark

US Patent:

62317547, May 15, 2001

Filed:

Dec 6, 1999

Appl. No.:

9/455885

Inventors:

Garland B. Brignac - Clinton NJ
John P. Greeley - Clinton NJ
Thomas R. Halbert - Baton Rouge LA
Craig A. McKnight - Sherwood Park, CA
Richard A. Demmin - Highland Park NJ
Janet R. Clark - Baton Rouge LA

Assignee:

Exxon Research and Engineering Company - Annandale NJ

International Classification:

C10G 4504

US Classification:

208217

Abstract:

A high temperature naphtha desulfurization process with reduced olefin saturation employs a partially spent and low metals content hydrodesulfurization catalyst having from 2-40% the activity of a new catalyst. The catalytic metals preferably include Co and Mo in an atomic ratio of from 0. 1 to 1. The catalyst is preferably at least partially regenerable, has less than 500 wppm of a total of one or more of nickel, iron and vanadium and preferably has no more than 12 wt. % catalytic metal calculated as the oxide. This permits selective deep desulfurization, with reduced olefin saturation, low product mercaptan levels and little or need for downstream mercaptan removal.