Mineral oils: processes and products – Products and compositions – Lubricating oils
Patent
1978-05-12
1979-06-26
Bashore, S. Leon
Mineral oils: processes and products
Products and compositions
Lubricating oils
48197R, 48210, 208 8LE, 260449M, 2604495, C10G 106, C10J 306
Patent
active
041592387
ABSTRACT:
Conversion of raw coal to distillate liquid and gaseous hydrocarbon products by solvent liquefaction in the presence of molecular hydrogen employing recycle of mineral residue is commonly performed at a higher thermal efficiency than conversion of coal to pipeline gas in a gasification process employing partial oxidation and methanation reactions. The prior art has disclosed a combination coal liquefaction-gasification process employing recycle of mineral residue to the liquefaction zone wherein all the normally solid dissolved coal not converted to liquid or gaseous products in the liquefaction zone is passed to a gasification zone for conversion to hydrogen, where the amount of normally solid dissolved coal passed to the gasification zone is just sufficient to enable the gasification zone to produce the process hydrogen requirement. The process of the present invention provides an unexpected improvement in the thermal efficiency of the combination process by increasing the amount of normally solid dissolved coal prepared in the liquefaction zone and passed to the gasification zone to enable the gasification zone to generate not only all of the hydrogen required by the liquefaction zone but also to produce synthesis gas in an amount adequate to supply all or a significant amount of the fuel requirements of the process. It would have been expected that shifting some of the processing load from the ordinarily more efficient liquefaction zone to the ordinarily less efficient gasification zone would decrease process efficiency, but the present combination process unexpectedly achieves an overall efficiency increase by said shift.
REFERENCES:
patent: 4039424 (1977-08-01), Hyde et al.
patent: 4075079 (1978-02-01), Lang
The SRC-II Process, Third Annual Int. Conf. on Coal Gasif. and Liq., Univ. of Pittsburgh Aug. 3-5, 1976, Schmid et al.
Clean Fuels from Coal Symposium Papers, I6T, Sep. 10-14, 1973, "An Overview of Coal Conversion Technology", Waterman pp. 673-684.
Bashore S. Leon
Gulf Oil Corporation
Kratz Peter F.
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