Uphethiloli ovela ku-fluid catalytic cracker: ingxenye ye-pentane nengxenye ebila kuze kube cishe ku-400 °F, okwenziwa ngokuqhekeka kukawoyela wegesi phezu kwesivusamsebenzi se-silica-alumina esiyimpuphu esintantayo. Ucebile ngama-olefin nama-aromatic, une-octane ephezulu impela; uvame ukwenziwa mnandi futhi uhlukaniswe ube ingxenye elula nesindayo yokuxuba. Usha kalula.