I would like to ask for ways to reduce the generation of sulfur trioxide in the waste gases from sulfur recovery
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Dear experts: I am a production manager involved in the production of sodium sulfite through alkaline absorption of exhaust gases from sulfur recovery (Claus) processes. After years of adjustment, the sodium hydrosulfite production unit in our company operates very stably, with waste emissions meeting regulatory standards. The sodium hydrosulfite products produced have an excellent crystal form and high brightness. The issue is that the sodium hydrosulfite content is between 90% and 93%; analysis shows that the remaining component is mainly sodium sulfate. Sulfate formation is mainly due to the continued oxidation of sulfur dioxide in the sulfur recovery unit to produce sulfur trioxide, which then reacts with soda ash to yield sodium sulfate. Could you please advise on how to reduce the generation of sulfur trioxide? Thank you.
Process analysis of furnace gas and purification system
Regarding the sulfur recovery units from the 1990s, I have recently contacted some design firms; the main idea is that sulfur dioxide reacts with oxygen in the presence of catalysts such as oxygen nitrogen, alumina, and iron oxide to form sulfur trioxide.