PRODUCTION OF HIGH-QUALITY GASOLINE BY CATALYTIC CRACKING OVER RARE-EARTH-METAL EXCHANGED Y-TYPE ZEOLITES OF HEAVY OIL FROM WASTE PLASTICS

The effects of reaction conditions and properties of the catalysts used on the product yields and quality of the gasoline fraction from the catalytic cracking of heavy oil obtained from waste plastics over rare-earth metal exchanged Y-type (REY) zeolites were examined. Gasoline with high contents of isoparaffins and low contents of n-paraffins and aromatics is desired in order to increase the research octane number and to achieve complete burning. A large amount of gasoline with these favorable components was obtained by the catalytic cracking of heavy oil over,a REY zeolite catalyst under the condition of a time factor (ratio of the mass of the catalyst to the mass flow rate of the feed oil) of 0.75-1 kg-cat.kg-oil(-1).h, a reaction temperature of 673 K, and a catalyst of small crystal size that has a moderate amount of sites of strong acid strength.