Multi-stage hydrodesulfurization of cracked naphtha streams with interstage fractionation

US6913688B2 · kind B2 · utility

Assignee

• EXXONMOBIL RESEARCH AND ENGINEERING COMPANY · US

Inventors

• John C. Coker · Baytown, US
• Garland B. Brignac · Clinton, US
• Thomas R. Halbert · Baton Rouge, US
• John G. Matragrano · Baton Rouge, US
• Brij Gupta · Thornhill, CA
• Robert C. Welch · Baton Rouge, US
• William E. Winter · Baton Rouge, US

Key dates

• Filing date: Oct 18, 2002
• Grant date: Jul 5, 2005
• Expiry date: Apr 10, 2023

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10L1/06
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A process for the selective hydrodesulfurization of olefinic naphtha streams containing a substantial amount of organically bound sulfur and olefins. The olefinic naphtha stream is selectively hydrodesulfurized in a first sulfur removal stage and resulting product stream, which contains hydrogen sulfide and organosulfur is fractionated at a temperature to produce a light fraction containing less than about 100 wppm organically bound sulfur and a heavy fraction containing greater than about 100 wppm organically bound sulfur. The light fraction is stripped of at least a portion ofits hydrogen sulfide and can be collected or passed to gasoline blending. The heavy fraction is passed to a second sulfur removal stage wherein at least a portion of any remaining organically bound sulfur is removed.