New plants


  • license and the know-how
  • basic and complete technological documentation
  • supervision over the plant’s erection and start-up
      pressure [bar] capacity [t HNO3/d]
    • medium pressure
    4-6 100-750
    • high pressure
    7-9 80-600
    • dual pressure
    3,5-5,5 / 9-15 300-1200

Charakterystyka procesu

  • HNO3 concentration: up to 68% wt.
  • NOx concentration in tail gases: < 70 ppm
  • N2O concentration in tail gases: < 100 ppm
  • ammonia consumption: 281-283 kg/t HNO3
  • platinum losses: 32-42 mg/t HNO3

The nitric acid production consists of the following stages:

  • Ammonia combustion (with air on Pt-Rh and Pd-Ni catalyst gauzes):
    4NH3 + 5O2 → 4NO + 6H2O + 905 kJ*
    * - the reaction heat is used for the production of overheated steam used to drive the turboset
  • Nitric oxide oxidation:
    2NO + O2 → 2NO2 + 113 kJ
  • Absorption of nitrogen dioxide in water:
    4NO2 + O2 + 2H2O → 4HNO3 + 343 kJ

The particular stages of nitric acid production can be realized as:

  • mono pressure process(medium-pressure: 4-6 bars; high-pressure: 7-10 bars)
  • dual pressure (oxidation: 3,5-5,5 bars; absorption: 9-15 bars)

An optimal plant solution is selected for each customer taking into account the cost of materials, feedstock, energy, investment cost and local conditions.


Grupa Azoty S.A., Tarnów AZOT Gorażde / Yugoslavia
Grupa Azoty Zakłady Azotowe (Nitrogen Plant) „Kędzierzyn” S.A. (600 t HNO3/d) NAN YA PLASTIC Corp. / Taiwan
Grupa Azoty Zakłady Azotowe (Nitrogen Plant) „Kędzierzyn” S.A. (900 t HNO3/d – process project)  

N2O emission reduction


  • technological analysis and the know–how
  • technical documentation of modernized catalyst baskets
  • delivery of catalyst for N2O emission reduction
  • supervision over installation of catalytic baskets and charging the catalyst for N2O decomposition

Process description:

  • temperature: 750-940 ˚C
  • pressure: ≤ 13 abs. bars
  • load: ≤ 75000 kg N/(m2·day)

A process of selective reduction of N2Oemission is conducted in a catalyst basket of ammonia oxidation reactor, according to the reaction:

  • 2N2O → 2N2 + O2
A catalyst layer is placed directly under catalyst gauzes used for ammonia oxidation. An optimal solution is selected for each client taking into account the catalyst basket construction and the operating parameters of the ammonia oxidation unit.


Grupa Azoty S.A., Tarnów Enaex S.A., Chile
Grupa Azoty Zakłady Azotowe „Kędzierzyn” S.A. Agropolychim Devnia, Bulgaria
Grupa Azoty Zakłady Azotowe „Puławy” S.A. Petrokemija Kutina, Croatia

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