Mineral oils: processes and products – Products and compositions – Lubricating oils
Patent
1979-11-27
1982-01-26
Metz, Andrew
Mineral oils: processes and products
Products and compositions
Lubricating oils
208127, 201 12, 202 99, 202108, C10G 100, C10G 928, C10B 4700, C10B 2120
Patent
active
043127401
ABSTRACT:
An improved method for retorting oil shale with heat-carrying bodies comprising relatively coarse attrition resistant, non-oil sorbing, shale ash particles wherein oil recovery is maximized. After retorting, the spent oil shale and heat-carrying bodies are transferred to a reheating vessel or combustor. The reheating vessel contains a dense phase fluidized bed wherein the fixed carbon contained in the spent shale is combusted at temperatures between 1100.degree. F. and 1600.degree. F. to reheat the heat-carrying bodies. The invention is based on the finding that the decomposition of kerogen, which is present as a binder in raw oil shale, leaves pores within kerogen-rich shale which results in relatively large surface areas. Attrition of the kerogen-rich shale in the dense phase fluidized bed at a superificial gas velocity of 7-14 ft/sec reduces the size of this porous, friable material and allows it to be removed in the exit gas stream as fines. The larger particles remaining in the fluidized bed originated as kerogen-lean shale and thus lack the surface area and resulting sorption capacity to adversely affect retorting. These relatively coarse, attrition resistant, non-oil sorbing particles thus may be used effectively as heat-carrying bodies.
In another feature of the invention, recovery of sensible heat from the coarse and fine combusted spent shale particles is accomplished in two separate coarse and fine fluidized bed coolers operated at specific conditions to maximize heat transfer and energy utilization.
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Metz Andrew
Tosco Corporation
Wright William G.
LandOfFree
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