Production of dilute nitric acid from nitrogen oxide exhaust gases

Using nitrogen oxide emissions to produce dilute nitric acid: The answer depends on the concentration of nitrogen oxides in the emissions. Generally, when the level of nitrogen oxides in the emissions is not high, water absorption is not effective, and the absorption is incomplete as well. The reaction 3NO2 + H2O = HNO3 + NO cannot proceed completely; therefore, it is not recommended to use water for absorbing nitrogen oxides. It is better to use an alkaline solution for this purpose, as that will ensure that the concentration of nitrogen oxides in the emissions remains within acceptable levels. If water must be used to dilute nitric acid, it depends on the pressure that your system can provide, as the reaction involves a decrease in volume; naturally, the higher the pressure, the better, which means it will result in additional consumption. Current environmental standards are very strict; it is necessary to ensure that nitrogen oxides in the exhaust gases are within acceptable levels. The exhaust gases generated in the production of dilute nitric acid also need to be treated, either by absorption with an alkaline solution (NAOH) or through catalytic reduction methods (using NH3 under the action of a catalyst). May I ask: what are the main products of your factory?

You are in the equipment manufacturing business; it shouldn’t be you who come up with the plans. Either the design department or the technical team at the chemical plant should develop the plans based on the production processes. They should provide you with the drawings, and you should then manufacture the equipment according to those drawings

The conditions you provided above are too simple. I don’t have time during the week; let me help you calculate it. Please tell me the specific components of the exhaust gas generated during the production of dilute nitric acid, as well as the pressure and temperature, along with the requirements regarding nitrogen oxides in those exhaust gases

Hello! The waste gas generated during the nitric acid oxidation process is pure nitrogen oxides; what is the best way to handle it now?

First use water absorption, then alkali absorption, and finally a reducing agent (ammonia) for catalytic reduction

Actually, it’s my fault for not explaining clearly. When a dilute nitric acid solution oxidizes other substances under high temperature and pressure, it turns into nitrogen oxides and water vapor. So now nitrogen oxides and water vapor come out together. In other words, if these nitrogen oxides and water vapor recombine, they should form my original dilute nitric acid solution. But at present, it’s not clear how to control the conditions to produce dilute nitric acid Do I need to build an absorption tower now, and another alkaline absorption tower as well? How should a tower be built? Are there any calculations that need to be done?

Also, when I emit nitrogen oxides and water vapor, it is at 200 degrees. Do I need to handle it first?