METHOD OF PRODUCING ENVIRONMENTALLY SAFE HIGH-OCTANE GASOLINE Russian patent published in 1999 - IPC

FIELD: gasoline production. SUBSTANCE: straight-run gasoline is preliminarily subjected to hydrofining process, hydrogenate is rectified to yield low- boiling and high-boiling fractions, the first one is isomerized and the second is subjected to catalytic reforming. A part (40-80%) of catalytic reforming gasoline is fractionated to give desired fraction boiling up to 85 C, part of which is combined with low-boiling fraction of hydrogenate in amount ensuring allowable total benzene content in product no higher than 5 wt %. Remaining part of catalytic reforming fraction boiling up to 85 C is subjected to hydroisomerization in a separate reactor in presence of catalyst containing VIII group metals on alumina carrier at temperature 300-400 C and pressure 2.5-3.5 Mpa, and fraction with boiling range from 130 C to dry point is isolated. This fraction is combined with catalytic reforming gasoline, alkylate, isomerizate, and hydroisomerizate at weight ratio (15-45): (1-40): (5- 40):(3-30), respectively. EFFECT: improved quality of product. 3 cl, 2 tbl, 4 ex