Exxon Research and Engineering Company

Amoco Corporation

Craig A McKnight

Garland B Brignac

Thomas R Halbert

Richard A Demmin

John P Greeley

Barry Bara

Sujit Bhattacharya

George Cymerman

Daniel John Bulbuc

William E Winter, Jr

Bruce R Cook

Janet Renee Clark

William B VanderHeyden

Robert William Skwarok

Narasimhan Devanathan

Peter J Klomans

Larry P Hackman

Joseph J Kociscin

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.

High temperature naphtha desulfurization using a low metal and partially deactivated catalyst

Selective and deep desulfurization of a high sulfur content mogas naphtha, with reduced product mercaptans and olefin loss, is achieved by a two stage, vapor phase hydrodesulfurization process with interstage separation of at least 80 vol. % of the H,S formed in the first stage from the first stage, partially desulfurized naphtha vapor effluent fed into the second stage. At least 70 wt. % of the sulfur is removed in the first stage and at least 80 wt. % of the remaining sulfur is removed in the second stage, to achieve a total at least 95 wt. % feed desulfurization, with no more than a 60 vol. % feed olefin loss. The second stage temperature and space velocity are preferably greater than in the first. The hydrodesulfurization catalyst preferably contains a low metal loading of Co and Mo metal catalytic components on an alumina support.

Two stage deep naphtha desulfurization with reduced mercaptan formation

An improved catalyst activation process for olefinic naphtha hydrodesulfurization. This process maintains the sulfur removal activity of the catalyst while reducing the olefin saturation activity.

Catalyst activation method for selective cat naphtha hydrodesulfurization

Apparatus and methods useful for degassing a reaction mixture in a petrochemical processing reactor are disclosed. The methods and apparatus employ a novel liquid-gas separator that includes non-linear risers and that discharges the mixture into a vapor space in a manner intended to maximize degassing of the mixture. Resid hydrotreating processes employing these methods also are disclosed.

Hydrocarbon processing apparatus

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Sherwood Park, Canada

Craig A McKnight