METHOD OF OBTAINING HIGH-OCTANE ENGINE FUELS

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FIELD : chemistry.SUBSTANCE : proposal is given of a method of obtaining high-octane engine fuels through cracking heavy oil stock in the presence of zeolite containing catalysts. The cracking process is carried out under the condition that, the oil stock undergoes hydroprocessing, with obtaining three fractions : initial boiling-180°C, 180-360°C, over 360°C, where over 360°C fractions are taken for cracking, obtaining three fractions after cracking : initial boiling-180°C, 180-360°C, over 360°C. The initial boiling-180°C and 180-360°C fractions, obtained after hydroprocessing and cracking are combined, obtaining components of end products. Not less than 10% of the heaviest cracking fraction is added to the hydroprocessing raw materials. A zeolite containing catalyst is used in the cracking process, chosen from a group comprising Y type zeolite, zeolite Y modified with rare-earth elements, either zeolite Y and ZSM-5 in ratio ranging from 2 : 1 to 10 : 1, or a system of catalysts containing Y type zeolite and ZSM-5 type zeolite in cation-decationated form, in ratio ranging from 2 : 1 to 10 : 1 in terms of zeolite, under the condition of differentiation of catalysts by strength and packed density of not more than 10%.EFFECT : increased gasoline octane number with minimum reduction of output of petrol and light gas oil from catalytic cracking, as well as reduced sulphur content in products.2 cl, 5 ex, 5 tbl