Sometimes referred to simply as the WSA process, the wet sulfuric process, is one of the most important desulfurization processes available today. First introduced and patented by a Danish firm in the 1980s, the WSA process is recognized today as one of the most efficient processes for recapturing sulfur from different types of process gases. In particular, the process can be suitable for processing streams that contain sulfur, including:
- Amine gas treating units
- Claus process tail gas
- Off gas stemming from sour water strippers
- Boiler flue gases
As a gas stream treatment method, the WSA process offers a number of advantages, including the ability to treat gas without the need to remove water from the gas. Consequently, it is not necessary to introduce a cooling/condensation step. This results in a low consumption of utilities. The WSA process also offers a simple layout. When handled properly, the WSA process can result in up to a 99% removal of sulfur content. The process can also be easily adapted for the removal of other impurities.