| 摘要 |
A hydrogenation region in a fixed bed reactor is defined with a first, a second and a third hydrogenation zones sequentially from the entrance of the reactor, and a sulfur-containing diesel gas oil feedstock is passed through the first, second and third hydrogenation zones sequentially under conditions of a temperature of 320 to 420° C., a pressure of 5 to 15 MPa, an LHSV of 0.5 to 3 h-1 and a hydrogen/oil ratio of 1000 to 5000 scfb, wherein (a) a catalyst consisting essentially of cobalt and molybdenum on a porous carrier containing alumina as a main ingredient is loaded in the first hydrogenation zone in an amount of 20 to 60 vol %, (b) a catalyst consisting essentially of nickel and tungsten on a porous carrier containing 85 to 99 wt % of alumina or amorphous silica-alumina and 1 to 15 wt % of zeolite is loaded in the second hydrogenation zone in an amount of 20 to 60 vol % and (c) a catalyst consisting essentially of cobalt and/or nickel and molybdenum on a porous carrier containing alumina as a main ingredient is loaded in the third hydrogenation zone in an amount of 10 to 30 vol %.
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