Cooling of stripped catalyst prior to regeneration in cracking process
A process is described for controlling the fluid catalytic cracking of a feedstock containing hydrocarbons, comprising the steps of: passing a mixture comprising catalyst and the feedstock through a riser conversion zone under fluid catalytic cracking conditions to crack the feedstock; passing the mixture, having a riser exit temperature, from the riser into a fluid catalytic cracking reactor vessel; separating a portion of catalyst from the mixture, with the remainder of the mixture forming a reactor vessel gaseous stream; heating the separated catalyst portion; stripping the combined catalyst, by contact with a stripping gas stream, consisting essentially of steam at a stripping temperature between 100/sup 0/F above the riser exit temperature and 1500/sup 0/F; cooling the stripped catalyst, prior to passing it into the regenerator vessel; wherein the cooling step comprises passing the stripped catalyst stream to a heat-exchanger located outside the reactor vessel; and regenerating the cooled catalyst stream in the fluid catalytic cracking regenerator vessel by contact with an oxygen-containing stream at fluid catalytic racking regeneration conditions.
- Assignee:
- Mobil Oil Corp., New York, NY
- Patent Number(s):
- US 4820404
- OSTI ID:
- 5967923
- Resource Relation:
- Patent File Date: Filed date 17 Feb 1987
- Country of Publication:
- United States
- Language:
- English
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