Why does ammonia enrichment in the system cause an excessive sulfur content in the carbon dioxide product gas?
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Please discuss why the accumulation of ammonia in the system leads to an excessive sulfur content in the carbon dioxide product gas
This is the first time I’ve heard of it【:lol I’m not very well-informed!】 Is the hydrogen sulfide level in your process gas above the limit? If the hydrogen sulfide level in the syngas is too high, it is due to (NH4)2S in the methanol-poor mixture; if the hydrogen sulfide level in the syngas is within normal limits, then everything is as it should be during normal production. That’s the issue with the top stream reflux from your T102, that is, the carbon dioxide product tower!
Is it because of the presence of ammonia, which, together with hydrogen sulfide, forms ammonium sulfide; this substance cannot be vaporized in the flash tank. As the pressure continues to drop, it decomposes in the CO2 stripping tower into H2S and ammonia, resulting in an excess of sulfur? Please ask experts to share their insights
Is it because the presence of ammonia reduces the absorption of hydrogen sulfide, thereby causing the sulfur content in the carbon dioxide product gas to exceed the specified limits?
Personally, I believe it is because the accumulated ammonia and hydrogen sulfide combine to form thiamine salts, which are then broken down and separated in T101, resulting in an increase in sulfur content. However, the mechanism behind the formation of this thiamine salt cannot be found at the moment; you can start by looking for information in this area. :handshake active participation
The amount of methanol circulated for absorbing the CO2 gas discharged is smaller
To produce ammonium sulfide, ammonia water + hydrogen sulfide are required