Patent ID: 7632977
Filing Date: 2009-12-15
Classification: B01J,C10G

Abstract:
1. A process for making middle distillate and lower olefins, said process comprises: catalytically cracking a gas oil feedstock within an FCC riser reactor zone by contacting under suitable catalytic cracking conditions within said FCC riser reactor zone said gas oil feedstock with a middle distillate selective cracking catalyst that comprises amorphous silica alumina and a zeolite to yield an FCC riser reactor product comprising middle distillate products and a spent cracking catalyst; regenerating said spent cracking catalyst to yield a regenerated cracking catalyst; contacting a gasoline feedstock with said regenerated cracking catalyst within an intermediate cracking reactor operated under suitable high severity cracking conditions so as to yield a cracked gasoline product, comprising at least one lower olefin compound, and a used regenerated cracking catalyst; separating said cracked gasoline product into a lower olefin product, comprising said at least one lower olefin compound; and using said used regenerated cracking catalyst as said middle distillate selective catalyst; wherein said middle distillate selective cracking catalyst comprises said alumina in the range from 40 to 65 weight percent; wherein said middle distillate selective cracking catalyst comprises a porous inorganic refractory oxide matrix component having a matrix surface area of from 20 to 90 square meters per gram of said catalyst; and wherein said middle distillate selective cracking catalyst comprises a zeolitic surface area of from 20 to 140 square meters per gram of said catalyst.