关键词: 催化裂化, 汽油, 苯, 芳烃

Abstract: The aromatics content of FCC naphtha was analyzed by gas chromatography method, and the results were correlated with the industry standard method (SH/T0693) quite well. Catalyst evaluation was carried out on a small scale fixed fluidized bed unit, the variations of aromatics contents in the gasoline fraction with the changes of reaction conditions and various catalysts were summarized. Although increase catalyst to oil ratio and increase reaction temperature were the two usual approaches for raising conversion, the results showed that their effects on the benzene content of gasoline fraction were different, the latter had significant influence, but the former had only a little influence. When additive for enhancing propylene yield was added in the catalyst system, the benzene content of FCC naphtha and propylene yield increased simultaneously.

Key words: catalytic cracking, gasoline, benzene, aromatics