the available works by SAE talk of upto 1:20 ratio that suggest that about 70% of gasoline present in air in 1:20 ratio would condense at upto 0 degree centigrade
Is condensation via cooling the only method you can use to remove the gasoline vapors from the air? If so then ' going cryogenic' seems inevitable and I'd begin with a simple acetone/CO2 solid mixture to begin with. To determine if it is sufficiently cold ( before trying liquid nitrogen ) I would first create a series of gas/air ratio mixtures to test for complete removal via gravimetric analysis provided you can slowly enough pass the vapor mixture through the collection system ( try sintered glass, the larger the cold surface area the better ) . If your goal is to simply remove the gas vapor, I'd suggested flowing it through activated charcoal bed and you still may be able to estimate the amount of gas via gravimetric method. Of course, no matter what you need a method to accurately determine the amount of the vapor mixture being passed through the system. Hope this helps.
Thank you Sir. Actually I am working in the petroleum industry that has HC vapours in the air.
I believe charcoal would also absorb moisture & some amount of oxygen. If, yes then it would adversely affect the balanced environment of the work area where I am trying to set the equipment. Also it would make gravimetric analysis corresponding to gasoline in the atmospheric air difficult.
So, I believe I would have to go for cryogenic cooling.
Yes the activated charcoal may pull in some water vapor, but cryogenic cooling will guarantee you condense ALL the vapor in the air and if you go too cold, you could even condense out components of the air such as CO2 If relative humidity is that big a problem, might dryerite or a molecular sieve take out the moisture without disturbing the organic vapor? Otherwise you may have to go to a much more complex method such as zonal freezing. If your goal is to not only remove but also analyze the vapor mixture, cryogenic cooling followed by gc ms or matrix assisted TOF ms may work?
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