초록 ▼

An improved catalytic process wherein trace amounts of a metal of period 5 and 6 of Group VIII or rhenium is added to the total catalyst inventory for cracking of gas oil is disclosed. With this improved process, the yield of gasoline, fuel oil, total cracked products, or predetermined combinations

An improved catalytic process wherein trace amounts of a metal of period 5 and 6 of Group VIII or rhenium is added to the total catalyst inventory for cracking of gas oil is disclosed. With this improved process, the yield of gasoline, fuel oil, total cracked products, or predetermined combinations thereof, is maximized for the fluid catalytic cracking of any predetermined feed, usually a gas oil. The process employs a kinetic predictive or a correlative model of the cracking process to identify proper operating conditions, including CO2/CO ratio in the effluent from the regenerator, and also requires control of the metal activity to achieve optimal conversion of CO to CO2 in the regenerator. Also disclosed is an improved method for control of a fluid catalytic process wherein the cracking catalyst comprises trace amounts of a metal selected from the group Pt, Pd, Rh, Ru, Ir, Os and Re.

대표청구항 ▼

In a process for the fluid catalytic cracking of a hydrocarbon oil in the absence of added hydrogen to produce products boiling in the gasoline and the fuel oil range, said process comprising contacting said hydrocarbon oil with a regenerated, porous acidic solid catalyst in a cracking vessel under

In a process for the fluid catalytic cracking of a hydrocarbon oil in the absence of added hydrogen to produce products boiling in the gasoline and the fuel oil range, said process comprising contacting said hydrocarbon oil with a regenerated, porous acidic solid catalyst in a cracking vessel under conditions effective to convert said oil to said products and deposit coke on said catalyst; transferring said coked catalyst to a regeneration vessel wherein in a dense fluid bed of catalyst is maintained at an elevated temperature and burning at least a portion of said coke in the presence of an oxygen containing gas with production of carbon dioxide and carbon monoxide in said dense bed, said production being characterized by a CO2/CO ratio; and recycling regenerated catalyst from said regeneration vessel to said cracking vessel to catalyze further cracking and supply at least part of the heat required for said cracking, the improvement in control of said regenerator which comprises: selecting a temperature within the range of about 1200°to about 1350°F. for operation of said dense bed; adding to said circulating catalyst a metal promoter selected from the group consisting of Pt, Pd, Rh, Ir, Os and Re in an amount effective to produce a CO2/CO ratio within the range of 1 to 6; determining the deviation of the temperature of the dense bed with metal promoter from said selected temperature; and adjusting the flow rate of the oxygen containing gas in the direction to reduce said deviation.