Process for retorting oil shale
Patent
·
OSTI ID:6733385
This invention relates to a process for retorting raw shale comprising the following steps: (1) passing raw shale downwardly through the upper zone of a two-zoned vertical retort; (2) introducing a gas comprising molecular oxygen and flue gas at a temperature of about 590* to about 760* C., and ambient pressure into said upper zone and passing the same upwardly through said upper zone in contact with said raw shale; (3) recovering from an upper part of said upper zone a product comprising shale oil and retort gas; (4) passing the treated shale from a lower part of said upper zone downwardly through the lower zone of said two-zoned retort; (5) introducing molecular oxygen at a temperature of about 25* to about 100* C. And flue gas at a temperature of about 25* to about 200* C., and ambient pressure into said lower zone and passing the same upwardly through said lower zone in contact with said treated shale; (6) recovering from an upper part of said lower zone a preheated gas comprising molecular oxygen and preheated flue gas; and (7) recovering from a lower part of said lower zone spent
- Assignee:
- Gulf Research and Development Co
- Patent Number(s):
- US 4222850
- OSTI ID:
- 6733385
- Country of Publication:
- United States
- Language:
- English
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