Patent ID: 7160439

Claim:
A process of hydrodesulfurizing a hydrocarbon mixture, which comprises: reacting said hydrocarbon mixture containing olefins and boiling within the range of C 4 to 250° C., and having a sulfur content of at least 150 ppm with hydrogen at a temperature ranging from 250° C. to 330° C., at a pressure ranging from 5 to 10 kg/cm 2 , at a WHSV ranging from 2 to 6 hours −1 and with a quantity of hydrogen ranging from 200 to 400 times the quantity of hydrocarbons present (Nl/l) in the presence of a catalytic composition comprising: a) an acidic carrier consisting of a silica and alumina gel, amorphous to X-rays, with a molar ratio SiO 2 /Al 2 O 3 of 30/1 to 500/1, having a surface area ranging from 500 to 1000 m 2 /g, a porosity of 0.3 to 0.6 ml/g and a pore diameter within the range of 10–40 Å; and b) a mixture of molybdenum and cobalt deposited on the carrier in an overall quantity ranging from 2 to 67% by weight with respect to the total amount of components (a)+(b), thereby effecting said hydrodesulfurization with concomitant skeletal isomerization of the olefins of said mixture under the hydrogenation conditions of the process which results in a ratio HYD/ISO ranging from 0.7 to 2.5, wherein HYD is the ratio of non-isomerized olefins, that have been hydrogenated, to olefins in the hydrocarbon mixture and ISO is the ratio of isomerized, hydrogenated and non-hydrogenated olefins to the sum of isomerized, hydrogenated and non-hydrogenated, olefins and non-isomerized, hydrogenated and non-hydrogenated, olefins.