Gas extraction of coal

Details Gas extraction of coal Gas extraction of coal

1974-11-26

1976-07-20

Wolk, Morris O.

Mineral oils: processes and products

Phenolic or toxic oils

48210, 210 36, 201 44, C10B 5700, C10G 104

Patent

active

039705412

ABSTRACT:
Process for the gas extraction of soluble constituents of coal which comprises heating the coal in the presence of an extractor to a terminal temperature of 400.degree.C. to 550.degree.C. where the extractant at the terminal temperature is in the gas phase to extract the soluble constituents from the coal and separating the extractant from the residue and recovering the extract from the extractant. The heating of the coal in the presence of an extractant is at an initial rate of 20.degree.C. per minute and preferably as fast as possible to an initial temperature of 370.degree.C. to 390.degree.C. preferably 380.degree.C. and thereafter heating the coal to a terminal temperature at a rate not more than 20.degree.C. per minute and preferably below 5.degree.C. per minute thereby minimizing secondary repolymerization reactions.

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patent: 3232861 (1966-02-01), Gorin et al.
patent: 3327402 (1967-06-01), Lamb et al.
patent: 3558468 (1971-01-01), Wise
patent: 3562783 (1971-02-01), Gorin

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