System and method for lowered hydrogen sulfide emissions from oi

Details System and method for lowered hydrogen sulfide emissions from oi System and method for lowered hydrogen sulfide emissions from oi

1982-09-15

1983-08-30

Gantz, Delbert E.

Mineral oils: processes and products

Products and compositions

Lubricating oils

208 8R, 204158R, 2041571R, 201 17, 202105, 202270, C10G 100, C10B 5700, C10B 2900

Patent

active

044015534

ABSTRACT:
Improved process and system for reducing the amounts of hydrogen sulfide emitted during pyrolysis of oil shale. At the elevated temperatures of oil shale pyrolysis, iron pyrite is converted to hydrogen sulfide which is emitted with the product gases and oils. Reduction in hydrogen sulfide emissions is accomplished by treating the oil shale with ultraviolet radiation of a particular wave length prior to pyrolysis in the presence of oxygen to selectively oxidize the pyritic sulfur to sulfate sulfur. The treated oil shale is then retorted at conventional temperatures. The sulfate sulfur does not decompose or otherwise convert to hydrogen sulfide at these temperatures. The sulfate sulfur remains in the spent shale residue and is discarded as waste to thereby effectively reduce the amount of sulfur emitted as hydrogen sulfide in the pyrolysis product gases.

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Lowry, Chemistry of Coal Utilization, 1945, p. 430.

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