| abstract |
Disclosed is a process for converting a hydrocarbon charge to a product containing improved yields of C 4 /C 5 olefins with a reduction in the loss of gasoline yield which comprises: n passing said hydrocarbon charge into contact with a catalyst comprising a phosphorus-containing medium pore zeolite mixed as an additive with Y-zeolite in a weight ratio of 0.005 to 0.10, said zeolites in separate or composite spray dried particles, n wherein the catalyst to oil ratio is 0.1 to 10, reacting said hydrocarbon charge at a temperature of 800° F. to 1200° F., a pressure of 0 to 150 psig, and in the absence of added hydrogen, thereby producing a product containing improved yields of C 4 / 5 olefins and reduced loss in gasoline yield. |