Study on Olefin Decrement Reformulation and Increasing Light Olefins of FCC Gasoline by Catalytic Cracking

Catalytic upgrading of fluid catalytic cracked (FCC) gasoline obtained from Huabei Petrochemical Company, PetroChina (Renqiu, Hebei, China), was investigated using a microreactor and gas chromatograph integrated unit in order to decrease the content of olefins in gasoline and increase the light olefins (ethylene, propylene, and butylene) content. The experimental results showed that the olefin content in upgraded gasoline can be decreased from 42.6% in raw material to nearly 10%, meeting the requirements of the new gasoline standard, whereas iso-alkane and aromatics contents were markedly increased, from 28.4 and 18.2% to 47 and 36.1%, respectively, so the octane number of gasoline should not be reduced. In addition, higher yields of light olefins were obtained after FCC gasoline was reformulated under laboratory conditions. Higher reaction temperature, longer reaction time, higher weight ratio of catalyst to oil, and higher catalyst activity were beneficial to decrease the olefin content of FCC gasoline and increase the yields of light olefins.