The Bureau of Mines performed chemical research to elaborate details of sulfur chemistry pertaining to the citrate flue gas desulfurization process in which sulfur dioxide (SO2), absorbed (as bisulfite ion) in a buffered sodium citrate solution, is reduced by hydrogen sulfide (H2S) according to the overall reaction 2H2S+HSO3- +H+->3S+3H2O. The rate-limiting step in the process was shown to be the reduction by H2S of thiosulfate (S2O32-) that is formed as an intermediate. Pseudo first-order kinetic measurements were made at room temperature to retard the reaction sufficiently that adequate analysis was possible.
Sulfur; Air pollution; Chemical reactions; Reaction kinetics; Absorbers; Materials; Flue gas desulfurization; Citrate process
IH; Report of Investigations
NTIS Accession No.
Salt Lake City, UT: U.S. Department of the Interior, Bureau of Mines, RI 8540
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