How can propylene in non-condensable gases be extracted?
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Our plant is currently equipped with a gas separation unit. In the non-condensable gas, the ratio of methane to air, as well as the ratios of ethane to ethylene, propylene to propane, are approximately 1:4:3:2. Propylene is lost in this way; please advise, senior colleagues, on how to separate propylene/
Generally, the pressure swing adsorption process is used
The absorption-desorption process can be employed
This post was last edited by RainWolf on 2010-10-21 at 15:37. It seems that ordinary refineries are equipped with gas fractionation units to obtain propylene of polymer-grade through distillation; the main challenge lies in separating propylene from propane. But the adsorption method also has to work. If there is a pyrolysis unit, the gas can be sent directly to the pyrolysis gas separation unit. (I just saw that what the original poster mentioned was the vapor pressure; it seems that the first thing to consider is improving the distillation efficiency of the vapor pressure control device, so as to achieve a more precise separation of the products.) Or consider adding a non-condensable gas cryocooler)