LENZING Technik > Engineering & Contracting > Environmental Technology > Catalytic Treatment

Topsoe WSA

Features

For recovery of sulphuric acid from CS₂/ H₂S containing gases

1. Simultaneous elimination of H₂S and CS₂
2. Recovery of sulphur as concentrated sulphuric acid
3. 97-99% reduction of total sulphur emissions
4. Extensive heat recovery, often with generation of excess heat as steam
5. No consumption of chemicals or adsorbents
6. No generation of liquid or solid waste

In Detail

PROCESS

In short, the WSA Process (Wet gas Sul-phuric Acid process) is a catalytic process which converts H₂S and CS₂ into SO₂ as a first stage. SO₂ is then converted into SO₃, and the SO₃ reacts with the water vapour and is condensed as concentrated sul-phuric acid of commercial quality (94-97 % wt depending on actual design conditions).

The catalytic process takes place around 400°C. This temperature is reached by feed/effluent heat exchange and by utilising the heat of reaction. In most cases no external energy (other than power for blowers) is necessary, and often excess heat is produced as steam. The process can in various versions treat gases with sulphur concentrations ranging from 0,2% to 6% (vol).

CATALYSTS

The oxidation catalyst is the Topsøe series CK catalyst applied in more than 300 oxidation plants world-wide. The SO₂ con-version catalyst is the Topsøe Series VK catalyst currently used in more than one third of the world's sulphuric acid pro-duction.

Support

For further details about this product group please contact:
environmental-tech@lenzing.com