REMOVAL OF UREA AND AMMONIA FROM EXHAUST GASES

摘要

The invention relates to a method for recovery of urea dust and ammonia from a gas stream by contacting said gas stream with an aqueous sulphuric acid solution, thus forming an acid solution of ammonium sulphate and urea, characterized in that the acid solution is concentrated to a melt comprising less than 5 wt% of water, which melt is subsequently transferred into solid particles comprising urea and ammonium sulphate.