Process for coal liquefaction

Details Process for coal liquefaction Process for coal liquefaction

1978-12-14

1981-02-17

Gantz, Delbert E.

Mineral oils: processes and products

Products and compositions

Lubricating oils

208131, 208 8LE, 423445, 423448, 252502, C10G 106, C10G 100, C10G 914, C01B 3100

Patent

active

042513464

ABSTRACT:
The invention provides a process for the liquefaction of coal. The comminuted coal is slurried in a solvent or pasting oil and digested, normally under hydrogen pressure, e.g. of 50 to 250 atmospheres partial pressure, under catalytic conditions, at temperatures between about 380.degree. and 500.degree. C., preferably 400.degree. to 470.degree. C. and residence times between about 10 and 100 minutes. The solvent or pasting oil is obtained wholly or mostly by recycling from the distilled fractionation of the reaction products. The solvent system comprises a light fraction in the boiling range up to 200.degree. C. and a heavy residue fraction, boiling mainly above 450.degree. C., there being a more or less well-defined lack of solvent in a boiling range intermediate between 200.degree. and 450.degree. C. Preferably less than 20%, e.g. 5% or less of the solvent system boils between 200.degree. and 450.degree. C. The ratio of low boiling to high boiling solvent is preferably from about 3:1 to 1:3.
The process can be controlled so that the coal is converted virtually completely into distillable products, more particularly predominantly in the crude diesel fuel range (200.degree. to 450.degree. C.). Optionally fractionating residue may be recovered as a further valuable product for making exceptionally high grade electrodes by delayed coking at 500.degree. C. followed by graphitization at 1400.degree. C.

REFERENCES:
patent: 3518182 (1970-06-01), Paterson
patent: 3558468 (1971-01-01), Wise
patent: 3563884 (1971-02-01), Bloomer et al.
patent: 3799865 (1974-03-01), Suetsiger et al.
patent: 3966584 (1976-06-01), Gray et al.
patent: 4019975 (1977-08-01), Urquhart
patent: 4045329 (1977-08-01), Johanson et al.

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