PREPRATION OF NITRIC ACID
METHOD OF PRODUCTION Ammonia Oxidation process Accounts for 90% production process is devided into four fundamental steps oxidation of NH3 to NO oxidation of NO to NO2 absorption of NO2 in water concentration of HNO3 CHEMICAL REACTION Oxidation of ammonia NH3 + 5/4 O2 = NO + 3/4 H2O H= - 54.0 Kcal NO2 + O2 = 2NO2 H= - 27.2 Kcal Nitrous oxide oxidation and absorption 2NO + O2 = 2NO2 H= - 27.2 Kcal 3NO2 + H2O = 2HNO3 +NO H= - 32.2 Kcal RAW MATERIALS NH3 from synthetic ammonia process Filtered air Platinum-rhodium make-up catalyst PROCESS DESCRIPTION Compressed air is mixed with anhydrous ammonia;fed to a shell and tube convertor designed so that the preheater and a steam heat recovery boiler superheater are within the same reactor shell. The convertor section consist of 10-30 sheets of Pt-Rh alloy in the