What is the purpose of the high-pressure ethylene line connected to the carbon dioxide hydrogenation system?
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This post was last edited by liaifeng on 2018-9-10 19:05 RT
To prevent excessive temperature rise during carbon dioxide hydrogenation, liquid ethylene is injected to cool the system. Given that the catalyst favors the formation of alkynes over alkenes, liquid ethylene is used to avoid excessive reaction temperatures; however, this is generally not necessary!
It seems to be used for pressurization, for use while driving
This post was last edited by TNCUL on 2017-3-16 at 12:59. After the carbon dioxide/ethylene interlock, a flare is used, followed by nitrogen purging and cooling of the propylene. Then, high-pressure ethylene is used to push the pressure up to the operating level. This approach allows for adjustment of the catalyst’s selectivity by reducing the partial pressure of the materials when feeding them into the reactor. I don’t know much about this; it’s probably a common practice in the propane removal process before hydrogenation in S&W processes!
I’m sorry; it’s wrong to use a blank object – it should be a torch
That’s what it says on the PI diagram, but I’m not sure what exactly its function is