Treatment method for nitric acid reaction waste gas (Huanglong)
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Currently, factories use concentrated nitric acid to react with silver in order to produce silver nitrate, which generates yellow smoke; the gas contains high levels of nitrogen oxides. How can such gas be treated? I searched for literature online, and it is generally divided into washing (with alkali solutions, acid solutions, etc.) and ammonia-catalyzed reduction, etc. Could someone with experience please offer some guidance? My reaction is characterized by intermittent responses, with a large amount of yellow smoke appearing momentarily.
Ozone oxidation, water absorption for reuse.
First, determine the characteristics of your process; it seems that NOX gases are generated as a result of reactions under normal pressure. In any case, it is necessary to increase the gas pressure. As for the subsequent washing steps, whether it be water washing or alkali washing, it is important to consider whether the wastewater can be reused. Ammonia oxidation catalysis requires certain temperatures and pressures, and it seems that these conditions may be difficult to meet in your case
Is it necessary to use concentrated nitric acid for producing silver nitrate? Diluted nitric acid should work just as well. Additionally, for the absorption of exhaust gases, oxidation with hydrogen peroxide could be considered; the resulting solution can then be used as dilute nitric acid, and the exhaust gases can be reduced catalytically using ammonia, thereby ensuring that they meet emission standards