the gas stream is maybe 200ml/min and comprised of dry oxygen, and maybe 10% iodine gas. and is heated to about 400C.
I was thinking of cooling the gas to in a long tube and then passing it into a cryocooled SS pipe at -50C and trying to condense out all the iodine. or bubbling the gas through a column of some non-polar solvent. hexane? ethanol? something I can easily and safely dispose of. recapture and reuse of iodine/solvents would be ideal.
not angering any EPA/workplace safety regulatory bodies is the top goal.
any ideas? know of any apparatus designed for this?
I would suggest to insert a 'cold finger' at the exhaust gas stream ― possibly cooled with dry ice; which can be mixed with methanol or acetone to reach ~ -77 ºC ― so that iodine crystals thus deposited could be recovered, what could be followed by a glass trap containing sodium thiosulfate (Na2S2O3) aq. solution, which would react with remaining sublimed iodine accordingly: 2Na2S2O3 + I2 → Na2S4O6 + 2NaI.
I suggest you to use a cold trap system. its containing 2 stainless steel cylindrical chambers. In small chamber, place the liquid N2 and exhaust gasses go through the distance between this cylinders. due to very low temperature of liquid N2 the exhaust gasses condense to solid phase then you can pick up these solid particles.
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