Process for desulfurization and denitration of a gas-oil-type hydrocarbon fraction that contains nitrogen compounds

A process for deep desulfurization of a hydrocarbon fraction with a distillation interval of between 150° C. and 450° C. and that contains nitrogen compounds with a content of more than 50 ppmN by weight, wherein said process comprises at least one adsorption unit for said nitrogen compounds followed by a hydrodesulfurization unit (HDS), wherein the adsorption unit for the nitrogen compounds comprises at last one capture mass selected among faujasite-type zeolites having an Si/Al ratio more than 1, which are regenerated by desorption with at least one part of desulfurized gas oil effluent obtained from the hydrodesulfurization unit, wherein the gas oil employed for the regeneration of the captive mass is sampled at a point of downstream from the hydrodesulfurization unit such that the temperature of the gas oil is between 140° C. and 180° C., and such that the water content of the gas oil corresponds to the saturation value at the temperature of the sampling point.