NAPHTHA DESULFURIZATION WITH NO OCTANE LOSS AND INCREASED OLEFIN RETENTION

摘要

Naphtha is desulfurized with no octane loss by forming an iso-olefinic naphtha feed and then selectively hydrodesulfurizing it to produce a mogas naphtha. The iso-olefinic naphtha feed may be formed from cracked naphtha, by contacting it with a solid acid catalyst to convert C6- ­olefins to C8-C12 iso-olefins and convert thiophenes to higher boiling sulftir compounds. Preferably only a heavy fraction containing the iso­olefins and higher boiling sulfur is selectively hydrodesulfurized.