Patent ID: 6264827
Filing Date: 2001-07-24
Classification: C10G

Abstract:
A manufacturing process of diesel gas oil with a high cetane number and a low sulfur content, said process comprising a first stage of contacting hydrogen with a petroleum distillate oil with a cetane number of at least 20 and less than 45, a sulfur content of at least 350 ppm, and a boiling point in the range of 200 to 430.degree. C. in the presence of a hydrogenation catalyst of a porous solid acid carrier carrying one or more hydrogenation-active metals selected from the group consisting of chromium, molybdenum, tungsten, cobalt and nickel, and a temperature from 320 to 500.degree. C. and a pressure from 30 to 110 kg/cm.sup.2 to obtain a hydrogenated oil with a cetane number of at least 45 and sulfur content of less than 350 ppm; and a second stage of contacting hydrogen with the hydrogenated oil from the first stage in the presence of a hydrogenation catalyst of a porous carrier carrying one or more hydrogenated-active metals selected from the group consisting of chromium, molybdenum, tungsten, cobalt and nickel, under a temperature from 200 to 400.degree. C. and a pressure from 30 to 110 kg/cm.sup.2 to obtain a hydrogenated oil with a superior storage stability without changing the cetane number and the sulfur content, wherein the temperature in the second stage is lower than the temperature in the first stage.