Hydrocarbon conversion with hot and cooled regenerated catalyst in series

Claim 1

In a heat balanced hydrocarbon conversion process wherein a hydrocarbon feed is converted to lower boiling products in a reactor by contacting the same at elevated temperatures with hot fluid cracking catalyst comprising a zeolite containing acid sites to form said lower boiling products and the resulting spent cracking catalyst containing coke from said reactor is separated from reaction products and stripped of volatile hydrocarbons in a stripping zone to provide stripped solid fluid cracking catalyst and said stripped catalyst is regenerated with an oxygen-containing gas in a regeneration zone to provide hot freshly regenerated fluid cracking catalyst which is returned to the reactor, the improvement which comprises cooling a portion of said hot freshly regenerated fluid cracking catalyst to provide a cooled portion of regenerated fluid cracking catalyst and a hot portion of regenerated fluid cracking catalyst, and contacting said cooled portion of regenerated fluid cracking catalyst with said hydrocarbon feed in said reactor downstream of contacting said hydrocarbon feed in said reactor with said hot portion of regenerated fluid cracking catalyst, thereby increasing the ratio of fluid cracking catalyst to said hydrocarbon feed.