Process for the production of deashed coal liquifaction products

Details Process for the production of deashed coal liquifaction products Process for the production of deashed coal liquifaction products

1975-10-23

1977-06-07

Levine, Herbert

Mineral oils: processes and products

Phenolic or toxic oils

208 96, 208251R, C10G 104

Patent

active

040282198

ABSTRACT:
This invention relates to an improved process for the production of deashed coal which includes contacting coal with coal dissolving solvent at elevated temperature and pressure in a hydrogen atmosphere and thereafter passing the resulting mixture to a vacuum tower to remove coal dissolving solvent for recirculation and leave vacuum tower still bottoms, which are substantially free of coal dissolving solvent. Said still bottoms then are contacted with a solubilizing solvent to dissolve a substantial quantity of said still bottoms after which said dissolved still bottoms are separated from undissolved still bottoms. The separation procedure may be effected by settling, countercurrent decantation, or filtration using pressure precoated rotary and plate filters and the like.

REFERENCES:
patent: 2871181 (1959-01-01), Kulik
patent: 2989458 (1961-06-01), Kulik
patent: 3010893 (1961-11-01), Kulik
patent: 3075912 (1963-01-01), Eastman et al.
patent: 3598718 (1971-08-01), Gleim et al.
patent: 3852183 (1974-12-01), Snell

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