USE OF UREA FOR REMOVAL OF NO x FROM SPENT ACID AND FROM THE FUMES COMING OUT DURING NITRATION (original) (raw)

The harmful effects of the NOx gases emissions in industrial and urban areas are receiving increasing attention. During the production of PETN lot of fumes containing NOx comes out and also lot of spent acid is generated as a byproduct. This spent acid contains some amount of dissolved PETN in it, before disposing of this spent acid it is heated to decompose the dissolved PETN. Lot of reddish yellow color fumes comes out during the process of heating. These fumes contain NOx which can be removed by using urea and alkali solution sprayed separately in the scrubber. The NOx fumes coming out during the production of PETN can also be removed with the help of Urea and alkali solution. The spent acid after fume off also contains dissolved NOx. This dissolved NOx can also be removed by treating the spent acid with the urea. This paper deals with the removal of NOx from spent nitric acid and also from the fumes coming out during the process of fume off and nitration with the help of urea and alkali.