Gases the easy way – Messer provides solutions - Strategic application technology
Teaser Recycling of Waste Sulphuric Acid
Recycling of Waste Sulphuric Acid
When oxygen is used as the oxidising medium, the nitrogen burden of the air is replaced by process gas containing sulphur dioxide, which can lead to a considerable increase in sulphuric acid production.
revised_Customer process spent acid regeneration in the Chemical sector
Spent acid regeneration
Thermal cracking of spent acid or sulphates
Acids burdened with organic impurities are reusable if the impurities evaporate with water or are destroyed by oxidation. Waste acids with high levels of non-volatile organic impurities can only be processed by thermal cracking. The processing costs of a thermal cracking system are determined by the process gas volume flow as well as its sulphur dioxide concentration.
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:
quantity of spent sulphuric acid [%]
spec. energy consumption [kcal/KG SA]
air flow rate total [m3/h]
O2 flow rate total [m3/h]
spec. O2 consumption [m3/t SA]
O2 concentration equivalent [% Vol]
The use of oxygen allows a significant increase in production and reduces the specific energy consumption per kg of sulphuric acid.