Mineral oils: processes and products – Products and compositions – Lubricating oils
Patent
1974-03-27
1976-05-04
Levine, Herbert
Mineral oils: processes and products
Products and compositions
Lubricating oils
208 50, 208 75, 208131, C10G 100
Patent
active
039545970
ABSTRACT:
The invention relates to a unitary and continuous process to produce the desired products, divided for clarity of description, into two sections: (A) Retorting section and (B) cracking section-the first comprising a retorting section which in one principal aspect may be an essentially tubular vertical retort, one type of which is shown in FIG. 1; or in another aspect a horizontal rotating retort sloping downwardly, in which in any event the oil shale is heated indirectly by the hot gases of combustion, and are kept separate from the oil vapors and gases from the oil shale. The hot combustion products of the fuel in general move upwardly and out of direct contact with the shale and products therefrom. The fuel in general is producer gas made from the spent oil shale and/or coke from the cracking section, and alternatively hydrocarbon gases both from the retort and cracking section of the process all of which fuels in general furnish the heat to support the entire operation including refining, steam generation and power production generally, including electricity. The oil vapors (and gases) from the oil shale pass into a fractionator and/or partial condenser which is directly connected to the oil shale retort (and a part of section A) and wherein the light oil distillate and water (from the oil shale) are condensed, separated and collected as an overhead product; and the major portion of the shale oil, i.e., the hot liquid condensate from the bottom of a fractionator and/or partial condenser which is the charging stock for cracking section B, may be pumped by a high pressure hot oil pump together with the hot reflux condensate from the dephlegmator of cracking section B through the highly heated cracking tubes of section B, and into one of the reaction and coking chambers of section B wherein the coke from the reaction is deposited and accumulated until ready for switching to another chamber for periodic cleaning and removal of the coke. The vapors leaving the reaction chamber pass into the dephlegmator of cracking section B where the overhead cracked or pressure distillate containing the unrefined product of the process is condensed and collected and separated, and the hot heavier reflux condensate from the dephlegmator of the cracking section B is continuously recycled, together with the major portion of the hot shale oil from the fractionator of the oil shale retort section A, to produce on a continuous basis the desired products of the process. The retort section A including the fractionator, etc. both at relatively high temperatures of the process, is under substantially atmospheric pressure or may be made slightly less (by use of a suction fan) to avoid leakage; whereas the cracking section of the process is entirely under a relatively high superatmospheric pressure throughout the system; and all the heating elements and those directly attached thereto e.g. the heater or cracking tubes, reaction or cracking chambers, and dephlegmator are at relatively high temperatures. The by-products of the process other than those used as fuel e.g. those produced from spent oil shale and their uses are obviously secondary to those of the principal invention.
REFERENCES:
patent: 2075599 (1937-03-01), Alther
patent: 2474345 (1949-06-01), Clark et al.
patent: 3093571 (1963-06-01), Fish et al.
patent: 3135618 (1964-06-01), Friese
patent: 3228869 (1966-01-01), Irish
patent: 3384569 (1968-05-01), Peet
patent: 3617480 (1971-11-01), Keel
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