revised_Application technology spent acid regeneration in the Chemical sector

Oxygen boosts spent acid regeneration

Capacity increases, energy savings & more


When oxygen is used as the oxidising medium, the nitrogen burden of the air is reduced and replaced by process gas containing sulphur dioxide, which can lead to a considerable increase in sulphuric acid production.


  • Increase in performance (Debottlenecking) of existing plants  
  • Reduced heat losses   
  • Flue gas conditioning
  • Increase in turnover and yield
  • Lower energy costs
  • Improved product quality


Table: Comparison of waste sulphuric acid process with and without oxygen input:

  without O2 with O2
quantity of spent sulphuric acid [%] 100 152
spec. energy consumption [kcal/KG SA] 2421 1724
air flow rate total [m3/h] 3500 3500
O2 flow rate total [m3/h] 0 327
spec. O2 consumption [m3/t SA] 0 252
O2 concentration equivalent [% Vol] 21 27,8


The use of oxygen allows a significant increase in production and reduces the specific energy consumption per kg of sulphuric acid.

revised_Customer process spent acid regeneration in the Chemical sector

Spent acid regeneration

Thermal cracking of spent acid or sulphates

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