Process for reducing coke on spent catalyst in a fluid catalytic cracking unit
Patent
·
OSTI ID:7263236
This patent describes the process of reducing coke and increasing volatile product yield in a catalytic cracking system wherein there is provided a hydrocarbon conversion zone, a stripping zone and a regeneration zone. It comprises introducing hydrocarbon feed material and cracking catalyst into the hydrocarbon converting zone under conditions causing substantial cracking of the feed material to light product and spent catalyst; separating product from the spent catalyst; conveying the spent catalyst to the stripping zone maintained at a pressure of from about 5 to about 50 psi within less than about minute from completion of cracking contacting the catalyst with a hydrogen donor in the vapor phase at a temperature above the boiling point of the donor, whereby a substantial portion of absorbed coke adhering to the catalyst is removed, prevented from forming or both; separating the donor from the catalyst and conveying the catalyst to the regeneration zone; and burning off any remaining absorbed coke from the catalyst in the regeneration zone and conveying the restored catalyst to the conversion zone.
- Assignee:
- Amoco Corp., Chicago, IL
- Patent Number(s):
- US 4871699
- OSTI ID:
- 7263236
- Country of Publication:
- United States
- Language:
- English
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