COS removal in Gas Sweetening Plant
We are working on a typical old gas sweetening system using MDEA, the challenge is how to remove trace levels of COS (3kg/h in a 20000kg/h stream) at medium to high pressure (20 – 35 bar) and 20 – 30 °C.
The gas contains close to 2%mol H2S and 30ppm of mercaptans. The existing process relies in MDEA + PZ alone, however the COS slip is too high which drives the system too hard to meet specifications increasing energy requirements.
So far we are thinking on injecting vapor into the dry gas stream (upstream of the column) to enhance the conversion of COS inside, or using a new process with selective adsorbents upstream, however, we are trying to avoid complex or expensive solutions.
Any successful stories or insights on dosing, Vapor injection, or any other real-world experience would be helpful.
Thanks in advance!
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