Cogas Development Company

Fmc Corporation

Louis D Friedman

Ralph Tracy Eddinger

In a fluidized coal gasification process in which heat for the gasifier is provided by recycle combustor residue from a slagging combustor, SO.sub.2 in the combustor's flue gas is removed by contacting the flue gas with the incoming coal feed whereby the SO.sub.2 is adsorbed on the coal and converted to H.sub.2 S in the gasifier. Sulfur is recovered from the H.sub.2 S in a Claus Plant.

Process for controlling sulfur oxides in coal gasification

In the multi-stage fluidized carbonization of coal to produce, oil, gas and char, oil containing vapors from the first stage are used as the fluidizing gas to dry the incoming coal feed. The oil vapor pressure of the fluidizing gas is maintained at a value under 10 mm. to prevent oil condensation in the fluidized drying vessel. The technique makes possible the recovery of sensible heat from the first stage overheads.

Fluidized coal carbonization

Densified fly ash pellets are produced by the steps comprising:

Densification of coal fly ash

Waste water formed in the gasification of coal and containing ammonia, H.sub.2 S, and phenolic compounds is treated to remove H.sub.2 S and a substantial proportion of its ammonia, while leaving sufficient ammonia in the water to maintain a pH of at least 8 (such as up to about 10.5, preferably about 8.5 to 9), the ammoniacal water is then flashed into a stream of superheated steam being fed to gasification zone. At the high temperatures in the gasification zone the organic impurities are decomposed.

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New Brunswick, NJ, United States of America

Louis D Friedman