Patent ID: 7785461

Claim:
A process for selective hydrodesulfurization of a naphtha charge containing olefins and organosulfur compounds, comprising the following steps: a) under hydrodesulfurization conditions, contacting the naphtha charge, in a first reactor charged with a hydrorefining catalyst, with a flow of hydrogencontaining a controlled admixture of at least one non-reactive compound, wherein the H 2 molar fraction in said flow ranges up to 1.0 and the H 2 S concentration at the reactor intake is limited to a maximum of 0.1% by volume to produce an effluent; b) removing H 2 S from the effluent of step a) to obtain a partially hydrodesulfurized naphtha; c) channeling the partially hydrodesulfurized naphtha obtained in step b) to a second reaction stage, using a reactor charged with a second hydrorefining catalyst, under similar hydrodesulfurization conditions as those in the first reactor, and contacting the partially desulfurized naphtha in the second reaction stage with a flow of hydrogen containing a controlled admixture of at least one non-reactive compound, wherein the molar fraction of H 2 in said flow ranges between 0.2 and 0.5 and the H 2 S concentration at the reactor intake is limited to a maximum of 0.05% by volume, and d) recovering a hydrodesulfurized naphtha while inhibiting olefin hydrogenation in such a way that the H 2 molar fraction in the first reactor is higher than the H 2 molar fraction in the second reactor.