Separation of C2H2-C2H4-C2H6-CH4 in pure O2

[tigerk2001]

What is the best way to separate C2H2-C2H4-C2H6-CH4 in pure O2 using a FID as detector.
I want to heartcut or backflush most part of the O2 to avoid to run the FID in O2.

thank you

[chromatographer1]

Use a backflush to vent three column heartcut configuration using a Chromosorb 106 or Porapak Q backflush column, a Porapak N as the second column and a shorter column of 106, Q, or N as the elution adjustment and buffer column.

Heartcut the O2 to vent and backflush the C3+.

Good luck,

Rod

[GasMan]

I would be interested to know why you do not want the oxygen in your sample to go through the FID.

Gasman

[chromatographer1]

My guess would be that Tigerk is operating an optimized FID to measure ppb amounts of hydrocarbon and does not want to have a big plug of oxygen disturb the flame at a critical measurement time for methane. For the same reason hydrogen is not used as a carrier but nitrogen or argon instead.

Of course he could use air as a carrier and the effect would be highly reduced but he would need to have extremely clean air to do his analysis.

best wishes,

Rod

[tigerk2001]

Exactly,
I want to use Argon as carrier and I need to measure low ppb hydrocarbons. So, I want to make sure the flame will be stable. I will use UHP H2 and air for flame.

So, by using Rod configuration I think I will be able to do the application.

what do you think?

[chromatographer1]

I would use nitrogen carrier unless that is a problem. A lot cheaper I think, no?

best wishes,

Rod