SNOX process

The SNOX process is a process which removes sulfur dioxide, nitrogen oxides and particulates from flue gases. The sulfur is recovered as concentrated sulfuric acid and the nitrogen oxides are reduced to free nitrogen. The process is based on the well-known wet sulfuric acid process (WSA), a process for recovering sulfur from various process gasses in the form of commercial quality sulfuric acid (H2SO4).[1][2][3]

The SNOX process is based on catalytic reactions and does not consume water or absorbents. Neither does it produce any waste, except for the separated dust.

In addition the process can handle other sulfurous waste streams. This is highly interesting in refineries, where e.g. hydrogen sulfide (H2S) gas, sour water stripper gas and Claus tail gas can be led to the SNOX plant, and thereby investment in other waste gas handling facilities can be saved.

  1. ^ Sulphur recovery; (2007). The Process Principles in sulphur recovery by the WSA process. Denmark: Jens Kristen Laursen, Haldor Topsoe A/S. Reprinted from Hydrocarbonengineering August 2007[verification needed]
  2. ^ Drbal, Larry (1996). Power Plant Engineering. ISBN 0412064014.[page needed]
  3. ^ Laursen, J. Kr.; Karavanov, A. N. (2006). "Processes for sulfur recovery, regeneration of spent acid, and reduction of nox emissions". Chemical and Petroleum Engineering. 42 (5–6): 229–34. doi:10.1007/s10556-006-0084-3. S2CID 108517506.