Mineral oils: processes and products – Products and compositions – Lubricating oils
Patent
1974-05-10
1977-03-01
Gantz, Delbert E.
Mineral oils: processes and products
Products and compositions
Lubricating oils
48197R, C10G 102
Patent
active
040100928
ABSTRACT:
Spent, coke-containing shale derived from a gas-heated eduction zone is passed through a combustion-gasification zone countercurrently to an upflowing mixture of steam and oxygen-containing gas to effect partial combustion of the coke on the spent shale, the resulting heat of combustion being used to effect concurrent endothermic gasification reactions of steam with unburned coke. The resulting net production of hot, steam- and hydrogen-containing water gas is then mixed with hot recycle gas derived from the shale eduction zone, the resulting mixture forming the heat carrier required for the gas-heated eduction zone. A recycle portion of the steam-rich water gas from the combustion-gasification zone is continuously withdrawn, passed through a steam generator to effect simultaneous cooling and steam enrichment thereof, and then recycled to the bottom of the gasification reactor. In this manner, a substantial portion of the necessary gaseous heat-carrying capacity is provided in the combustion-gasification zone without losing the heat of vaporization of the steam in the recycle portion of water gas. A surprising aspect of the invention is that even though the recycled water gas contains hydrogen, and must pass through the combustion-gasification zone in which hydrogen-burning temperatures prevail, the overall yield of hydrogen is not significantly affected.
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Gantz Delbert E.
Hartman Richard C.
Hellwege James W.
Henderson Lannas S.
Sandford Dean
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