FIELD: petrochemical processes. SUBSTANCE: hydrocarbon stock is brought into contact with catalyst, containing high-silica zeolite including phosphorus and alkali-earth metal and having Pentasil catalyst structure, in reactor with mobile catalyst and subjected to catalytic conversion at temperature from 480 to 680 C and pressure 1,2•105 to 4,0•105 Pa with contact time 0.1 to 6 s, catalyst- and steam-to-hydrocarbon stock weight ratios ranging from 4: 1 to 20:1 and from 0.01:1 to 0.5:1, respectively. EFFECT: achieved production of liquid hydrocarbons, preferably ethylene, propylene, isobutylene, and isoamylenes plus high-octane gasoline as by-product. 20 cl, 9 tbl, 7 ex
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