| 摘要 |
A process for removing oxides of nitrogen from a gas in which the molar ratio of NO to NO2 is greater than 1. Sufficient NO is oxidized by the reaction NO+2HNO3=H2O+3NO2 by a solution whose HNO3 concentration is maintained above about 20% to form a gas whose molar ratio of NO to NO2 is close to 1. Substantially equivalent amounts of NO and NO2 are absorbed by a solution whose pH is maintained below about 2 containing HNO3 and dissolved NH3. The absorbed oxides of nitrogen react with the dissolved NH3 at a temperature above about 50 DEG C. to form elemental nitrogen and water. The process can be carried out in several steps or in substantially one step.
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