Coal extraction

Details Coal extraction Coal extraction

1988-08-08

1991-03-05

Pal, Asok

Mineral oils: processes and products

By treatment of solid mineral, e.g., coal liquefaction, etc.

Specified agitation or circulation in gas contact zone

208409, C10G 104

Patent

active

049975480

ABSTRACT:
Recycled oil solvents for coal extraction have their content of saturated cyclic species reduced by thermal cracking at 470.degree. to 540.degree. C. for a few minutes, restoring their effectiveness as solvents for coal.

REFERENCES:
patent: 4219403 (1980-08-01), Nakako et al.

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