Abstract: Exploration on catalytic conversion of straight-run middle distillate was conducted in a fixed fluidized bed reactor. The results show that catalytic cracking process is a practical technology for the conversion of straight-run middle distillate into high value added products. The gasoline yield of 48% and the propylene yield of 8% are obtained in this process. While using direct catalytic pyrolysis at 620 ℃ the total yield of light olefins and BTX is above 39% and a yield of byproduct gasoline with RON 99 is approximately 22%. The higher blending ratio of straight-run with heavy oil feed for FCC improves the gasoline selectivity, but increases the aromatics content in gasoline.

Key words: catalytic cracking, catalytic cracking, straight-run middle distillate, gasoline, light olefins