Fluid cat cracking heavy using stripped catalyst for feed preheat and regenerator temperature control

A fluid catalytic cracking process for producing lighter boiling products from a hydrocarbon feed which comprises the steps of:

• (a) contacting said feed with a particulate, hot, regenerated cracking catalyst in a catalyst cracking reaction zone at conditions effective to catalytically crack said feed and produce lower boiling hydrocarbons and coked catalyst particles which contain strippable hydrocarbons;
• (b) separating said lower boiling hydrocarbons from said coked catalyst particles which contain said strippable hydrocarbons;
• (c) passing said coked catalyst particles which contain said strippable hydrocarbons into a stripping zone and stripping said strippable hydrocarbons from said coked catalyst particles to produced stripped, coked catalyst particles;
• (d) passing said stripped, coked catalyst particles from said stripping zone into a catalyst regenerating zone, with at least a portion of said particles also passing through a heat exchange zone located between said stripping and regenerating zones, in which at least a portion of said feed is heated by said stripped, coked catalyst particles in indirect heat exchange relationship prior to being passed into said catalytic cracking zone;
• (e) passing a gas comprising oxygen into said regenerating zone which operates at conditions effective for oxygen to oxidize said coke and regenerate said catalyst particles, and
• (f) passing said regenerated catalyst particles into said catalytic cracking zone.