Regenerated nitrogen

Sources of regenerated nitrogen associated with sediments... 

Hayden, R.A. (1995). Process for regenerating nitrogen-treated carbonaceous chars used for hydrogen sulfide removal. International Patent WO 95/26230. 

The ozone can in turn be destroyed by reaction with nitric oxide, thereby regenerating nitrogen dioxide ... 

A process development known as NOXSO (DuPont) (165,166) uses sodium to purify power plant combustion flue gas for removal of nitrogen oxide, NO, and sulfur, SO compounds. This technology reHes on sodium metal generated in situ via thermal reduction of sodium compound-coated media contained within a flue-gas purification device, and subsequent flue-gas component reactions with sodium. The process also includes downstream separation and regeneration of spent media for recoating and circulation back to the gas purification device. A full-scale commercial demonstration project was under constmction in 1995. 

Nitrogen Oxide Emissions. Nitrogen oxide (NO ) emissions from an FCCU regenerator are much less, typically 100 ppm, than SO emissions, and consequently much less attention has been given to the development of technology to reduce FCCU NO emissions. As environmental constraints continue to tighten, this situation is expected to change. 

Increasing the nitrogen content in the reactor feed generally increases NO emissions in the regenerator. Increasing feed nitrogen content from 200—300 ppm to >100 ppm has been reported to increase NO emissions from 50 ppm to >450 ppm (46). 

The semiregenerative procedure for catalyst regeneration varies slightly between catalyst vendors however, it typically follows these general steps plant shutdown, carbon bum, oxidation and chlorination, nitrogen purge, reduction, and plant start-up. During the plant shutdown, Hquid hydrocarbons... 

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