Low-Temperature Hydrofining of Catalytically Cracked Light Gasoline Fraction

Distribution of sulfur compounds in catalytically cracked (CC) light (IBP-130 °C) and heavy (130°-EP) gasoline fractions is studied, and separate hydrofining of these fractions on GKD-205 and S-12 catalysts is performed. Hydrofining of catalytically cracked light gasoline fractions is conducted at low temperature (70-100 °C) and pressure (0.5-1 MPa) to minimize the drop in octane number (ON). Under these conditions, the degree of hydrogenolysis of the total and mercaptan sulfur comprises 72.7 and 93 %, respectively, and the degree of hydrogenation of olefins is 9.2 %. When equal proportions of light and heavily catalytically cracked gasoline fractions are blended, and the blend obtained is added to commercial gasoline in the amount of 45-50 %, the total sulfur content in the latter falls from 200 (without hydrofining of the CC gasoline) to 30 ppm. The ON loss is no more than 0.5 point.