Patent ID: 7678262

Claim:
An improved hydrocracking process with a recycle, comprising eliminating polyaromatic compounds from at least a portion of the recycle by adsorbing said polyaromatic compounds on an adsorbant comprising alumina and silica with a mass content of silica (SiO 2 ) of more than 5% by weight to 95%, said adsorbant having: a sodium content of less than 0.03% by weight; a total pore volume, measured by mercury porosimetry, in the range 0.45 to 1.2 ml/g; a porosity such that: i) the volume of mesopores with a diameter in the range 40 Å to 150 Å and a mean pore diameter in the range 80 Å to 140 Å represents 30-80% of the total pore volume measured by mercury porosimetry; ii) the volume of macropores with a diameter of more than 500 Å represents 20-80% of the total pore volume measured by mercury porosimetry; a BET specific surface area in the range 200 to 550 m 2 /g; and an X ray diffraction diagram which contains at least the principal characteristic peaks of at least one of the transition aluminas included in the group composed of alpha, rho, khi, eta, gamma, kappa, theta and delta aluminas.