Study on Catalytic Cracking Process of Fluid Catalytic Cracking(FCC)Gasoline to Produce Light Olefins and Aromatic Chemicals
Fluid catalytic cracking(FCC)gasoline was used as feed,and a comparative study was conducted on the product distribution and properties of light olefins and aromatic chemicals produced by catalytic cracking of FCC gasoline in riser process and fluidized bed process.The differences in chemical yield and hydrogen balance between the two processes were also analyzed.The results showed that the fluidized bed process had a higher depth of FCC gasoline cracking,and exhibited higher yields of dry gas,liquefied petroleum gas,and coke,as well as higher aromatic content of gasoline products.The hydrogen transfer reaction in the riser process was weaker than that of fluidized bed process,and the content of light olefins in the gas products was significantly higher than that in the fluidized bed process.As the reaction temperature increased,the increase in gas product yield in the riser process was higher,and the coke yield in the fluidized bed process promoted significantly.At a reaction temperature of 600℃,the light olefins yield in the riser process reached 30.77%,the aromatics yield reached 39.71%,and the total chemical yield reached 70.48%,which was more than 2 percentage points higher than the total chemical yield in the fluidized bed process.About 50%and 60%of the hydrogen of feed during the riser and fluidized bed process were transferred to the products,respectively.The riser process had a higher chemicals yield and less hydrogen consumption,indicating that the riser process had higher utilization efficiency for hydrogen in feed.
FCC gasolineCatalytic crackingLight olefinsAromaticsRiser reactorFluid bed reactor
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