Rollie B Williams

US Patent:

43659756, Dec 28, 1982

Filed:

Jul 6, 1981

Appl. No.:

6/280750

Inventors:

Rollie B. Williams - Baytown TX
Ramachandra A. Nadkarni - Baytown TX

Assignee:

Exxon Research & Engineering Co. - Florham Park NJ

International Classification:

C10J 354

US Classification:

48197R

Abstract:

In a coal gasification operation or similar conversion process carried out in the presence of an alkali metal-containing catalyst wherein particles containing alkali metal residues are produced, alkali metal constituents are recovered from the particles by treating them with electromagnetic radiation having a frequency between about 0. 10 MHz and about 10. sup. 5 MHz in the presence of water or other aqueous medium. During the treatment step, the electromagnetic radiation facilitates the extraction of alkali metal constituents from the water-insoluble alkali metal compounds comprising the alkali metal residues. The resultant aqueous solution enriched in water-soluble alkali metal constituents is then separated from the particles depleted in alkali metal constituents and recycled to the gasification process where the alkali metal constituents serve as at least a portion of the alkali metal constituents which comprise the alkali metal-containing catalyst.

US Patent:

44089996, Oct 11, 1983

Filed:

May 11, 1981

Appl. No.:

6/262146

Inventors:

Ramachandra A. Nadkarni - Baytown TX
Rollie B. Williams - Baytown TX

Assignee:

Exxon Research and Engineering Co. - Florham Park NJ

International Classification:

C10L 902
C10G 104

US Classification:

44 1SR

Abstract:

Coal, oil shale and similar carbonaceous solids are beneficiated by subjecting the solids to electromagnetic radiation having a frequency between about 0. 1 MHz and about 10. sup. 5 MHz in the presence of an aqueous acid solution. The electromagnetic energy enables the acid to solubilize a substantial portion of the mineral matter contained in the solids at low temperatures and pressures, thereby producing beneficiated carbonaceous solids containing relatively small amounts of inorganic constituents.