Abstract
Experiments on the absorption of sulfur dioxide and/or nitrogen dioxide diluted with nitrogen into aqueous solutions of sodium hydroxide and sodium sulfite with a plane interface were carried out at 1 atm and 25/sup 0/C in an agitated vessel (15 cm high, 10 cm ID). From a mixture with nitrogen oxides and nitrogen, the rate of nitrogen dioxide absorption into aqueous sodium hydroxide solution was enhanced by the presence of the sulfur dioxide, but into aqueous sodium sulfite solution, the rate was reduced. Such absorption behavior arose from the change of sulfite concentration at the gas-liquid interface. Therefore, the rate of nitrogen dioxide absorption with sulfur dioxide can be predicted according to the previously proposed mechanism of competitive reactions of nitrogen dioxide with sulfite and water. These results suggest that it may be possible to develop an economical process for removing sulfur dioxide and nitrogen oxides simultaneously from stack gases by an alkaline solution, especially at high sulfur dioxide concentrations.
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