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Acetaldehyde
Posted: Thu May 03, 2007 12:16 pm
by pseudotexan
I am trying to separate Acetaldehyde from a balance of Isobutylene. I can't get it far enough after it to do a good separation. Does anyone know how to get it in front of the Isobutylene. I am currently using 10% Carbowax 20 M on Chromosorb W HP. Any suggestions would be greatly appreciated.
Thanks
Paul
Posted: Thu May 03, 2007 3:22 pm
by chromatographer1
A trifluoropropyl methyl silicone column should do the job.
You could also try a 1% Carbowax 20M on Carbopack B or 1% TCEP on Carbopack B. should reverse order the elution.
best wishes,
Rod
Posted: Thu May 03, 2007 3:27 pm
by pseudotexan
How about Haysep D. Any idea of the relative rt of isobutylene on that one? Acetaldehyde should come out very early on that.
Posted: Thu May 03, 2007 3:41 pm
by chromatographer1
It should be fairly close.
If there is no water in your stream I would try the trifluoromethyl silicone first.
Then try Q or D Porous Polymer. It may take more than 6 ft of column.
Then try the Carbopack B.
Are you trying to measure less than 500 ppm?
Good luck.
Rod
Posted: Thu May 03, 2007 3:46 pm
by pseudotexan
Yes I am looking for about half of that in a balance of Isobutylene which is why I am trying to get in front of it. I am having no luck heartcutting it out and it is driving me crazy!!!
Posted: Thu May 03, 2007 3:52 pm
by chromatographer1
If capillary were possible a LOWOX from Varian or a Oxyplot from Agilent would be an obvious choice.
Process applications used to keep me up at night.
Keep having fun (to steal a line from another chromatographer) !
Guess what, you might try a high loading of methyl silicone or Apiezon L.
There is 28°C difference in boiling point.
Good luck.
Rod