Patent ID: 7767075

Claim:
A method of producing in a fluid catalytic cracking unit containing a regenerator, a reactor, and a stripper section with first and second stages, the method comprising: separating spent catalyst from a hydrocarbon product in the reactor, the spent catalyst having trapped hydrocarbon thereon; separating with a first stripping gas the trapped hydrocarbon in the first stage of the stripper section of the reactor; reacting an additional feed with the spent catalyst in the second stage of the stripper section, defining a gas product and depositing additional coke on the spent catalyst, wherein the second stage of the stripper section is located below the first stage of the stripper section and the additional feed is injected into the second stage of the stripper section of the reactor through a feed injection line; separating with a second stripping gas the gas product from the spent catalyst in the second stage of the stripper section, wherein the second stripping gas is injected below the feed injection line; and removing coke from the spent catalyst in the regenerator, producing heat for operating the reactor at reactor temperatures.