STUDY ON CATALYTIC CRACKING PROCESS OF HYDROGENATED STRAIGHT-RUN DIESEL
The effects of reaction severity and catalyst type on catalytic cracking of hydrogenated straight-run diesel were investigated in a small fixed fluidized bed unit.Two processing schemes were designed to produce more liquefied petroleum gas(LPG)and gasoline from catalytic cracking of hydrogenated straight-run diesel.The experimental results showed that conversion rates exceeded 75％on the different catalysts rich in Y-type zeolite and ZSM-5 zeolite under different reaction conditions,such as reaction temperature of 520-600 ℃ and catalyst/oil mass ratio of 6.0-10.0.With the increase of conversion rate,the yield of LPG increased,the yield of gasoline decreased and the research octane number(RON)increased.To produce more LPG,it's suitable for using ZSM-5 zeolite catalyst at the temperature of 600 ℃ and catalyst/oil mass ratio of 9.96,the yields of LPG and propylene were 36.48％and 16.33％,respectively.Besides,the total yield of ethylene,propylene and butylene was 34.49％.To produce more gasoline,it's suitable for using Y-type zeolite catalyst at the temperature of 520℃ and catalyst/oil mass ratio of 6.05,the yield of gasoline was 60.22％and the RON was 94.1.Under the crude oil price system of 80 $/bbl(1 bbl=159 L),the per ton oil profits of the two processing schemes were 329.5 Yuan and 296.9 Yuan,respectively.
万方数据
维普
