Wet Scrubber System

NOxcompact

Nitrogen oxides also called nitrous gases or NOx-gases are generated by many processes as e.g. during the reaction and concentration of nitric acid or the combustion of fossile energy sources. NOx-gases are harmfull to health but also a valuable source for the production of nitric acid. Gases with a low content of NOx as they are e.g. generated during a combustion process are mostly converted with ammonia via catalyzed processes into nitrogen and water. In case of higher NOx concentrations the gases are mostly guided through aqueous absorption columns where the aim can be to remove or scrubb the NOx from the waste gases and/or to produce nitric acid. Scrubbers are designed and built by De Dietrich Process Systems in many dimensions and different versions as per your needs. If oxygen is not present and the scrubber is operated with an aqueous non-oxidzing media as water the NO of the NOx will pas the scrubber while other NOx are dissolved as nitrous and nitric acid or nitrites and nitrate under caustic conditions. When adding oxygen the NO will be oxidized in the gasphase to NO2 to become nitric acid and is dissolved in water which is the common way to produce nitric acid. When adding oxidizing agents to the liquid phase as hydrogenperoxid or potasium permanganate nitrites are oxidized to nitrates improving the scrubbing process. Such semi-batch wise operated absorption systems are commonly provided by us when periodically operated processes as the dissolving process of metals with nitric acid generate the NOx-waste stream.