C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/343
C01B 17/04 (2006.01) B01D 53/34 (2006.01)
Patent
CA 1098287
"ABSTRACT OF THE DISCLOSURE" A feed gas containing one or more components selected from the class consisting of H2S, SO2, SO3, COS, CS2, light mercaptans, and sulfur vapor is desulfurized by (a) hydrogenat- ing and hydrolyzing essentially all non-H2S sulfur components to H2S, (b) oxidizing most of the H2S in the resulting product gas to sulfur, and removing the latter by condensation, (c) oxidizing the residual H2S to SO2, (d) absorbing essentially all of the SO2 in an aqueous ammonia solution, (e) passing a portion of the SO2-containing ammonia solution to step (a), and (f) discharging from step (d) a purified product gas essentially free of sulfur components. A feed gas, such as a stack gas, which contains only SO2 and SO3 components to be removed therefrom, may be treated in alternative embodiments of the invention involving the passage of all or a major proportion of the feed gas directly to absorption step (d). In all embodiments of the invention a substantial proportion of NOx components, if present in the feed gas, is also removed.
311708
Fetherstonhaugh & Co.
Union Oil Company Of California
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