How to adjust the excessive carbon dioxide level in the propylene produced by the gas separation unit?
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How can I adjust the high carbon dioxide level in the propylene produced by the gas separation unit? I really appreciate any advice you can offer
Should carbon dioxide not be vented from the top of the deethanizer?
Is there too much carbon dioxide in the raw materials?
The carbon dioxide content in liquefied gas is not high yet
I only have a basic understanding of the gas separation process; please correct me if I’m wrong. Under normal circumstances, it’s understandable for there to be a high level of carbon dioxide in dry gas, but do you analyze carbon dioxide in liquefied gas as well? Liquefied gas needs to go through a desulfurization process, which utilizes the adsorption properties of solvents for removing hydrogen sulfide; however, these solvents also absorb carbon dioxide, to some extent. Therefore, my personal suggestion is to increase the concentration of the solvent and raise the load on the regeneration tower, in order to improve the absorption efficiency of hydrogen sulfide and carbon dioxide; let’s see what the effects are in actual operation
How is carbon dioxide controlled there, and what are the targets?
It’s probably a problem with the operation of Tower 2; the non-condensable gases at the top of the deethanizer haven’t been properly removed
What is your desulfurization solvent? We use nitrogen-methyldiethanolamine, which is very effective at absorbing carbon dioxide; 40% of our acidic gases consists of carbon dioxide
This issue can be traced back to the catalytic cracking unit; during the fluidization process, the regenerator carries carbon dioxide into the settler, which eventually ends up in the dry gas and liquefied gas. If these two units are arranged coaxially, it is possible for flue gas to penetrate into the settler. The carbon dioxide carried by the catalyst can be removed using a desulfurization agent. However, if flue gas does manage to get inside, the amount of carbon dioxide will be high, and the desulfurization tower may not be able to remove it completely, resulting in elevated levels of carbon dioxide. I’m not sure whether the catalytic cracking and regeneration systems in your facility are arranged coaxially