Process for producing low-ash, low-sulfur coal

Details Process for producing low-ash, low-sulfur coal Process for producing low-ash, low-sulfur coal

1983-06-20

1985-05-14

Dees, Carl F.

Fuel and related compositions

Liquid fuels

Aluminum or heavy metal, other than lead, containing

201 17, C10L 902

Patent

active

045169802

ABSTRACT:
Pyritic sulfur, organic sulfur, and ash-forming minerals are removed from coal by a 2-stage alkaline treatment, using sodium carbonate or bicarbonate as the reagent. The first stage is an alkaline oxidation at moderate temperatures (130.degree.-150.degree. C.), and the second stage is a non-oxidizing alkaline treatment at a much higher temperature (250.degree.-330.degree. C.). The alkaline treated coal is extracted with an aqueous mineral acid, preferably hot aqueous sulfuric acid (H.sub.2 SO.sub.4) followed by washing with hot water. The resulting low-ash, low-sulfur coal can be used as a fuel in oil-firing boilers, and for similar applications where minimal-ash content is a basic requirement.

REFERENCES:
patent: 3660054 (1972-05-01), Rieve
patent: 3993455 (1976-11-01), Reggel et al.
patent: 4095955 (1978-06-01), Stambaugh et al.
patent: 4254464 (1981-03-01), Ray
Crawford, BIOS Final Report No. 522, Item No. 30, Feb. 19, 1946, British Intelligence Objectives Sub-Committee, London (A.T.I.-118668, Central Documents Office, Wright-Patterson Airforce Base, Dayton, Ohio).
Am. Chem. Soc. Div. of Duel Chem. Preprints, 17 (1): 44-48.
Stambaugh et al., Hydrocarbon Processing, 54 (7): 115-116 (1975).
Chem. Eng. Commu., 12: 137-159.

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