The Technology Trogress in Decreasing Olefins of FCC Gasoline

With the improvement of environmental protection concern, the requirement for combustion quality of gasoline becomes much stricter. Based on the trends of developing technologies in decreasing olefin of FCC gasoline, the technology of FCC, etherification, aromatization and hydrorefinement are reviewed in this paper. Improving the process of FCC gasoline is the effective measure to decrease olefins of FCC gasoline. Etherification of FCC light gasoline and aromatization decrease olefins of FCC gasoline whereas increase octane number greatly. However, the content of aromatics and ethers are restricted in gasoline. The content of the olefin in FCC gasoline could be reduced completely by the aid of the hydrorefinement method. Nevertheless the octane number of gasoline would fall sharply, while olefin was being saturated completely. Hence, researchers developed selective hydrogenation catalysts and technology that could clearly increase its stability and decrease the loss of octane number of FCC gasoline.