Process for hydrodesulphurizing gasoline employing a catalyst with controlled porosity

摘要

A novel process is described which allows selective hydrodesulphurizing gasoline cuts containing sulphur-containing compounds and olefins. The process employs a catalyst comprising a support selected, for example, from refractory oxides such as aluminas, silicas, silica-aluminas or magnesia, used alone or as a mixture, a group VI metal, preferably Mo or W which may or may not be promoted by a group VIII metal, Co or Ni. The catalyst is characterized by a mean pore diameter of more than 22 nm. The process may comprise one or more steps.

主权项

1. A process for hydrodesulphurizing a gasoline, comprising at least two successive hydrodesulfurizations, each hydrodesulfurization being conducted by subjecting a gasoline feed to a catalyst, wherein at least one hydrodesulfurization employs a catalyst comprising a support and an active phase comprising nickel or cobalt and in which the mean pore diameter of said catalyst is more than 20 nanometers, wherein activity of the catalyst of a hydrodesulfurization n+1 is 30-90% of the activity of hydrodesulfurization n, in which the successive steps are carried out without intermediate degassing, in which the reaction temperature in hydrodesulfurization n+1 is higher than that hydrodesulfurization n, and in which the catalyst of hydrodesulfurization n+1 has a lower metals content than that of the catalyst of hydrodesulfurization n.