Recovery of hydrocarbon values by controlled eduction and oxidat

Mineral oils: processes and products – Products and compositions – Lubricating oils

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201 32, C10G 102

Patent

active

040826457

ABSTRACT:
In the process for recovering energy values from oil shale by the cross-flow retort technique, an improvement is disclosed wherein controlled oxidation of non-vaporizable carbonaceous residue not only provides additional heat for the continuation of the oil educing process without application of external heat but also enables the continuation of a temperature profile which is below that at which adverse chemical and physical changes occur in the shale. According to the invention the moving bed is removed from exposure to external heat as soon as oil eduction has been completed in the upper bed regions. It is thereafter immediately exposed to unheated gases containing measured amounts of oxygen. Oxidation is initiated in those regions of the bed which are above about 800.degree. F. The heat generated by such oxidation may be utilized, in place of externally heated gases, to transfer heat to the lower regions of the bed for oil eduction from those lower regions.

REFERENCES:
patent: 2560767 (1951-07-01), Huff
patent: 3325395 (1967-06-01), Ban
patent: 3483115 (1969-12-01), Haddad et al.
patent: 3560369 (1971-02-01), Rowland et al.
patent: 3644193 (1972-02-01), Weggel et al.

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