Patent ID: 6544407
Filing Date: 2003-04-08
Classification: C10G,Y10S

Abstract:
A process for the preparation of a mixture of hydrocarbons which can be used as middle distillate fuel starting from a mixture of substantially linear hydrocarbons comprising at least 20% of a high-boiling fraction having a distillation temperature of over 370Â° C., said process comprising a hydrocracking step wherein said mixture of substantially linear hydrocarbons is heated in the presence of hydrogen to a temperature ranging from 250 to 450Â° C. and a total pressure of 0.5 to 15 MPa, for a time sufficient to convert at least 40% of said high boiling fraction into a fraction of hydrocarbons which can be distilled at a temperature lower than 370Â° C., wherein said hydrocracking step is carried out in the presence of a supported catalyst comprising:(A) a carrier of an acid nature comprising a calcined gel of silica-alumina amorphous to X-rays, having a molar ratio SiO2/Al2O3 between silica and alumina within the range of 30 and 500, a surface area ranging from 500 to 1000 m2/g, with a porosity ranging from 0.2 to 0.8 ml/g, with an average pore diameter within the range of 10 and 40 Ã¥; (B) one or more noble metals of groups 8, 9 or 10 of the periodic table, deposited on said carrier (A) in a quantity ranging from 0.05 to 5% by weight.