METHOD OF PREPARING LOW-SULFUR DIESEL FUELS Russian patent published in 1999 - IPC

FIELD: petrochemistry. SUBSTANCE: diesel fractions are subjected to hydrorefining in the presence of number of catalysts containing 30-80 wt % of alumo-cobalt- molybdenum catalyst as upper layer and 20-70 wt % of alumo-nickel-molybdenum catalyst as lower layer, provided that activation of catalysts is carried out with disulfides in amount of [0,2•K/(K+H)] kg per 1 kg of catalyst system wherein K is content to alumocobalt-molybdenum catalyst in pack, kg; H is content of alumo-nickel- molybdenum catalyst, in kg, followed by additional desulfurization of catalyst pack with stock at temperature of 330-340 C. EFFECT: higher degree of hydrodesulfurization. 7 ex, 1 tbl