Sulfur recovery: Flue gas treatment using the sodium-alkali method
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New standards for sulfur recovery exhaust emissions are set to be implemented soon, and it is difficult for SCOT exhaust treatment systems to meet the emission standard of 100 mg/m3 in key areas. In flue gas desulfurization, the sodium-alkali method is used to absorb exhaust gases; let’s discuss its feasibility!
Sodium sulfite is produced, but I don’t know why it doesn’t work. I know that alkaline slag is very difficult to handle. The 48% concentrated alkali purchased costs less than 600 yuan per ton, while the alkaline slag containing sodium sulfide that results from diluting it costs several thousand yuan per ton, and it has to be sent to other manufacturers for disposal.
Does Yu Gong have access to information on this topic? Is it similar to the catalytic gasoline alkaline washing process, which removes hydrogen sulfide and thiol compounds from exhaust gases to ensure that emissions meet the standards?
Our company also uses this kind of process; do you use it as well?
We are also considering exhaust gas treatment; could you provide detailed information on the sodium-alkali process and its performance?
The process is simple: an alkaline solution is used to absorb SO2 from the exhaust gases, producing sodium sulfite, which is then oxidized to sodium sulfate. The control of the system and its operational stability are key factors. The treatment effect is very good, achieving levels of 15 ppm; the output is also high. However, at present, it is sufficient for the exhaust from sulfur treatment units in refineries to have levels below 100 mg.
What should be done regarding the treatment of sodium sulfate? Is it usually entrusted to others for handling, or are there any better methods?
Generally, it is discharged directly after adjusting the pH to neutral, or it can be recovered through evaporation and concentration; however, the amount recovered is so small that it’s not cost-effective
Using ionic liquids for absorption gives good results
The technology is pretty good; it’s just the right time to learn* it