초록 ▼

A process for catalytically hydrotreating a heavy oil containing soluble metals in two steps at a temperature of 320°to 470°C. and a hydrogen pressure of 30 to 350 kg/cm2, wherein the oil is substantially desulfurized in the first step in the presence of a first-step catalyst and then demetallized i

A process for catalytically hydrotreating a heavy oil containing soluble metals in two steps at a temperature of 320°to 470°C. and a hydrogen pressure of 30 to 350 kg/cm2, wherein the oil is substantially desulfurized in the first step in the presence of a first-step catalyst and then demetallized in the second step in the presence of a second-step catalyst, the desulfurization selectivity (as defined in the specification) of the first-step catalyst being higher than that of the second-step catalyst. According to this process, the metal content and the sulfur content of the treated oil can be prescribed at the desired levels, and a low-sulfur, low-metal oil can be obtained with a relatively small amount of hydrogen chemically consumed.

대표청구항 ▼

In a process for hydrotreating a heavy oil containing soluble metals in two steps at a temperature of 320°to 470°C. under a hydrogen pressure of 30 to 350 kg/cm2, the improvement which comprises using a first-step catalyst having a desulfurization selectivity g1 in the first step and a second-step c

In a process for hydrotreating a heavy oil containing soluble metals in two steps at a temperature of 320°to 470°C. under a hydrogen pressure of 30 to 350 kg/cm2, the improvement which comprises using a first-step catalyst having a desulfurization selectivity g1 in the first step and a second-step catalyst having a desulfurization selectivity g2, which is lower than g1, in the second step, each of the desulfurization selectivities g1 and g2 being defined by the following equation: gg1 or g2)=(lnSo/S)/(lnMo/M) wherein So and S represent the sulfur contents of the starting heavy oil and the treated oil respectively, and Mo and M represent the metal contents of the starting oil and the treated oil respectively, and maintaining the partial pressure of hydrogen in the first step 10 to 50 kg/cm2 lower than that in the second step.