Mineral oils: processes and products – Phenolic or toxic oils
Patent
1977-09-26
1978-10-31
Gantz, Delbert E.
Mineral oils: processes and products
Phenolic or toxic oils
208 10, C10G 104, C10G 108
Patent
active
041233476
ABSTRACT:
A process for liquefying a particulate coal feed to produce useful petroleum-like liquid products which comprises contacting; in a series of two or more coal liquefaction zones, or stages, graded with respect to temperature, an admixture of a polar compound; or compounds, a hydrogen donor solvent and particulate coal, the total effluent being passed in each instance from a low temperature zone, or stage to the next succeeding higher temperature zone, or stage, of the series. The temperature within the initial zone, or stage, of the series is maintained about 70.degree. F and 750.degree. F and the temperature within the final zone, or stage, is maintained between about 750.degree. F and 950.degree. F. The residence time within the first zone, or stage, ranges, generally, from about 20 to about 150 minutes and residence time within each of the remaining zones, or stages, of the series ranges, generally, from about 10 minutes to about 70 minutes. Further steps of the process include: separating the product from the liquefaction zone into fractions inclusive of a liquid solvent fraction; hydrotreating said liquid solvent fraction in a hydrogenation zone; and recycling the hydrogenated liquid solvent mixture to said coal liquefaction zones.
REFERENCES:
patent: 2202901 (1940-06-01), Dreyfus
patent: 3505203 (1970-04-01), Nelson
patent: 3692662 (1972-09-01), Wilson et al.
Exxon Research & Engineering Co.
Gantz Delbert E.
Hoover Wayne
Proctor L. A.
Thierstein Joan
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