Low CO for increased naphtha desulfurization

US7422679B2 · kind B2 · utility

Assignee

• EXXONMOBIL RESEARCH AND ENGINEERING COMPANY · US

Inventors

• Edward S. Ellis · Berkeley Heights, US
• Thomas R. Halbert · Baton Rouge, US
• Garland B. Brignac · Clinton, US
• John P. Greeley · Fairfax, US
• Richard A. Demmin · Highland Park, US
• Theresa A. Lalain · Bel Air, US

Key dates

• Filing date: May 1, 2003
• Grant date: Sep 9, 2008
• Expiry date: Jun 16, 2024

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10G2400/02
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Naphtha hydrodesulfurization selectivity is increased by reducing the amount of COX (CO plus ½ CO2) in the hydrodesulfurization reaction zone to less than 100 vppm. While this is useful for non-selective hydrodesulfurization, it is particularly useful for selectively desulfurizing an olefin-containing naphtha without octane loss due to olefin saturation by hydrogenation. The COX reduction is achieved by removing COX from the treat gas before it is passed into the reaction zone.