The structure of the yield of products of catalytic cracking of vacuum gasoil and repeated cracking of light naphtha in the high-temperature region was investigated. The results of the studies served as the basis for developing catalytic cracking technology with a high yield of light olefins.With the increase in the demand for production of propylene as feedstock for petrochemistry and stiffening of environmental requirements for motor fuels that increase the proportion of alkylate and MTBE in automotive gasolines, the world oil refining industry is examining the role of catalytic cracking on a finely disperse catalyst alone as a source of high-octane gasolines. A trend toward expanding the range of application of this process with orientation both in the traditional direction and toward maximum output of light olefins -ethylene, propylene, and butylenes " has recently been noted.The leading Western companies -licensers of catalytic cracking technology -offer DCC (Shaw ECG, Axens), MAXOFIN (KBR), PETROFCC (UOP), MILOS (Shell GS), INDMAX (Lummus Tech), etc., processes that increase the yield of propylene to 12-22 wt. % and the yield of butylenes to 10-15 wt. %. The yield of light olefins is a function of the feedstock quality and increases with an increase in the paraffins and naphthenes in the composition.Russian oil companies are also considering the prospects for increasing the demand for feedstock for production of polypropylene and other petrochemical products both abroad and within the country. The technical regulation that sets more rigorous standards for the quality of automotive gasolines in 2012 reflects the necessity of increasing the yield of butylenes for subsequent manufacture of alkylate and MTBE as components of automotive gasolines. To satisfy these demands, many Russian OR are planning to equip new cat crackers oriented toward maximum production of propylene and butylenes in the future.In consideration of the growing interest in catalytic cracking with a high yield of light olefins, research and planning-design studies to create domestic technology and equipment for this process were conducted.

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