Combination hydrocarbon cracking, hydrogen production and hydrocracking

Claim 1

A process for producing a hydrocracked oil which comprises in a cracking zone cracking a hydrocarbon oil in the presence of a catalyst, fractionating cracked vapors thus produced to obtain a cycle oil and hydrocracking said cycle oil in the presence of hydrogen obtained as follows: regenerating in a regenerator in said cracking zone spent catalyst as obtained from said cracking and having coke laydown thereon, under conditions to combust said coke to produce a flue gas containing carbon monoxide, recovering said flue gas from said regenerator, adding at least one of water and steam to quench said recovered flue gas and as needed to adjust the temperature of said flue gas and to provide steam reactant; in an ensuing water shift reaction, subjecting said recovered flue gas containing carbon monoxide and now containing steam to a water shift reaction to produce carbon dioxide and hydrogen recovering hydrogen from said water shift reaction product and using said hydrogen, thus obtained and recovered, for said hydrocracking of said cycle oil.