The effect of blending the straight-run diesel from atmospheric and vacuum e-quipment of the third atmospheric distillation(hereinafter referred to as the third atmospheric distillation diesel)on operation parameters,regenerated catalyst characteristics,product quality and product yield of the catalytic cracking unit in a petrochemical enterprise was analyzed through industrial trials.The experimental results showed that blending of the third atmospheric distillation diesel didn't significantly change the operation parameters of the unit and the basic properties of the regenerated catalyst,and influence on operation flexibility and processing ca-pacity of the unit was kept at a low level.The third atmospheric distillation diesel possessed bet-ter catalytic cracking performance,which could increase the yield of catalytic cracking gasoline by 0.97 percentage points.It was helpful to reduce the ratio of fuel to gasoline in refinery.How-ever,the yield of liquefied gas from the catalytic cracking and the yield of propylene in liquefied gas was decreased by 0.71 and 0.19 percentage points respectively,which wasn't conducive to increase the production amount of liquefied gas and propylene products.
catalytic crackingthe third atmospheric distillation dieselthe ratio of diesel to gasolinediesel oil from vacuum tower
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