Fuel and related compositions – Liquid fuels – Aluminum or heavy metal – other than lead – containing
Patent
1977-07-18
1978-10-24
Dees, Carl F.
Fuel and related compositions
Liquid fuels
Aluminum or heavy metal, other than lead, containing
208 8, C10L 910, C10G 100
Patent
active
041219104
ABSTRACT:
A method of treating a solid carbonaceous material comprising essentially lignite or bituminous or subbituminous coal to provide therefrom finely dispersed solid particles substantially free of ash and sulfur, by mixing the solid material with a liquid aqueous alkaline solution comprising essentially a sodium, potassium, or ammonium hydroxide, hydrosulfide, or carbonate, or a plurality thereof; dissolving the material by heating the resulting mixture to a temperature in the range of about 125.degree. C to the critical temperature, at a pressure of at least about 25 psig, while maintaining a substantial portion of the mixture in the liquid state; separating from the resulting solution any undissolved coal, ash, and other solids; reducing the pH of the solution to less than about 9 to precipitate therefrom a powder comprising the carbonaceous material, with a substantial proportion of the ash and sulfur that had been in the starting material now remaining in solution; and separating the precipitated powder from the solution. Typically either the pH of the solution is gradually reduced to less than about 2 during a time of at least about 5 minutes, or the precipitated powder is washed with an acid solution having a pH of less than about 2.
REFERENCES:
patent: 1569871 (1926-01-01), Morrell
patent: 1868333 (1932-07-01), Morrell et al.
patent: 2400515 (1946-05-01), Kent
patent: 3284343 (1966-11-01), Shirley et al.
patent: 3719587 (1973-03-01), Karchmer et al.
patent: 3796650 (1974-03-01), Urban
patent: 3993455 (1976-11-01), Reggel et al.
Battelle (Memorial Institute)
Dees Carl F.
Dunson Philip M.
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