Method of preparing low-sulfur, low-ash fuel

Details Method of preparing low-sulfur, low-ash fuel Method of preparing low-sulfur, low-ash fuel

1976-05-20

1977-06-21

Dees, Carl F.

Fuel and related compositions

Liquid fuels

Aluminum or heavy metal, other than lead, containing

44 1R, 208 8, C10L 500, C10L 900, C10G 100

Patent

active

040308936

ABSTRACT:
A method of preparing low-sulfur, low-ash fuel from coal while simultaneously recovering valuable chemical products and taking advantage of a surprising co-action between comminution and dissolution and characterized as the steps of comminuting the coal in the presence of an alcohol containing 1-4 carbons atoms, inclusive; forming an admixture of the comminuted coal and alcohol to have a desired minimum of solids; separating the admixture into a first underflow of high density solids, a first middling stream of coal in alcohol and a first overflow stream of the alcohol and its dissolved and suspended constituents; separating the first underflow into a second underflow having therein the sulfur and solids that would form ash if burned and a second overflow comprising a dilute slurry of the coal in the alcohol and dissolved and suspended constituents; separating the first middling stream into a third underflow of high density solids, a second middling stream of coal with only a minor amount of sulfur and high density solids and a third overflow comprising the alcohol and dissolved and suspended constituents; separating the first overflow into a fourth underflow and a fourth overflow; refining the fourth overflow into respective desired chemical products, or constituents and the alcohol; and forming a low-sulfur, low-ash fuel from the second middling stream. Also disclosed are specific preferred steps including the treatment of the low-sulfur, low-ash coal to turn it into a puffed coal that burns readily to produce a hot flame with very low pollution emissions, while recovering alcohol and valuable chemicals, organic gases and the like.

REFERENCES:
patent: 2133280 (1938-10-01), Burk
patent: 3748254 (1973-07-01), Gorin
patent: 3754876 (1973-08-01), Pennington et al.
patent: 3856658 (1974-12-01), Wolk et al.
patent: 3920418 (1975-11-01), Rice

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