Where does the acetylene produced as a by-product in the MTO reaction come from? What is the reaction mechanism?
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This post was last edited by Joes_1234 on 2016-11-23 at 15:23. Recently, the acetylene content in MTO reactions has increased slightly; so, which reaction is responsible for the small amount of acetylene produced as a byproduct of MTO? I would appreciate it if experts could give me some advice. Thank you.
In the side reactions of MTO, the bimolecular hydrogen transfer reaction of olefins to form alkynes, dienes, and aromatics should occur very rarely. Are there any specific data to support the claim of an increase mentioned by the original poster?
A change of 0-3PPm should not have a significant impact. Sometimes, differences in the analysis equipment used at the central laboratory or variations in the operators may be responsible for this, so it might be necessary to monitor the situation for a longer period. I hope the original poster will share updates in due course
It won’t have a significant impact in the long term, but the cause of the acetylene formation is not yet clear, so I’m posting this to ask for help.
I have a similar issue: recently, the acetylene content in the product gas has increased suddenly, which led to an accident involving one of the tanks. However, the operating conditions are not very different from normal; the reaction temperature is slightly higher, around 483 degrees. But this isn’t considered high, as no such problems occurred when the temperature was 485 degrees in the past. I hope experts can help provide a solution
Which company are you from? What process?
China Coal’s DMTO. It’s possible that the products formed underwent a secondary reaction in the dilute phase; the impact of 3PPM is not significant. In normal production, there is already 3.4PPM of acetylene present. When the level reaches 7PPM, management orders that the flow be directed to the emergency tank, as there is a concern that it could have a significant impact on the polyethylene production facility.
I don’t think so; based on the actual operation conditions on site, it’s likely around 3 ppm, and it’s unlikely to exceed 5 ppm.
The actual level is above 5PPm, and this has happened several times; in the worst case, it even exceeded the limit. The actual cause remains unknown; it’s just a guess. I hope someone from Shenhua Baotou or Xinxing Company on this forum can provide an answer