|Chlorine Absorption in S (IV) Solutions (EPA/600/R-01/054) August 2001
The rate of chlorine absorption into aqueous sulfite/bisulfite (sulfur [IV]) solutions was measured at ambient temperatures using a highly characterized stirred cell reactor. The reactor media were 0 to 10 macromolecules (mM) sulfur (IV) with pH ranging from 3.5 to 8.5.
Experiments were performed using 20 to 300 parts per million (ppm) chlorine in nitrogen. Chlorine absorption was modeled using the theory of mass transfer with chemical reaction. Chlorine reacts quickly with sulfur (IV) to form chloride and sulfate. Chlorine absorption is enhanced by increasing pH and sulfur (IV) concentration. Due to mass transfer limitations, the rate constant for the reaction of chlorine with sulfur (IV) was too rapid to be precisely measured using the existing stirred cell reactor. However, the most probable value of the rate constant was determined to be 2 x 109 L/mol-s.
These results are relevant in the simultaneous removal of chlorine, sulfur dioxide, and elemental mercury from flue gas. The developed model shows that good removal of both chlorine and mercury should be possible with the injection of 1 to 10 ppm chlorine to an existing limestone slurry scrubber. These results may also be applicable to scrubber design for removal of chlorine in the pulp and paper and other industries.
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