C - Chemistry – Metallurgy – 10 – G
Patent
C - Chemistry, Metallurgy
10
G
196/72, 196/5.8
C10G 1/06 (2006.01) C10G 1/00 (2006.01) C10G 1/08 (2006.01) C10J 3/00 (2006.01) C10L 9/02 (2006.01) F02B 3/06 (2006.01)
Patent
CA 1120879
ABSTRACT OF THE DISCLOSURE 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 cata- lytic conditions, at temperatures between about 380 and 500°C, preferably 400 to 470°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 solvents system comprises a light fraction in the boiling range up to 200°C and a heavy residue fraction, boiling mainly above 450°C, there being a more or less well-defined lack of solvent in a boiling range intermediate between 200 and 450°C. Pre- ferably less than 20%, e.g. 5% or less of the solvent sys- tem boils between 200 and 450°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 par- ticularly predominantly in the crude diesel fuel range (200 to 450°C). Optionally fractionating residue may be recovered as a further valuable product for making excep- tionally high grade electrodes by delayed coking at 500°C followed by graphitisation at 1400°C.
318322
Beukes Quintin J.
Dry Leonard J.
Kleynjan Cornelis
Kirby Eades Gale Baker
Sasol One (proprietary) Limited
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