Gas chromatography: components proportion not supposed to vary with oven temperature ?

Hello,

I would to write a project about gas concentration measuring in wind tunnel, but I need to know some price estimation of flame ionisation detector (FID) and its accesories. I need to know prices of 1) slow response FID and 2) fast response FID. I would like to use only the FID with amplifier and a tracer gas (ethane), I do not need a gas chromatograph. Can you give me some price estimations? Thanks.

How we can selectively do the sulponation of the primary alcohol in presence of secondary alcohols using tosyl chloride?

The induced current is produced because of the induced magnetic field and is passing through the coil (which generates the external magnetic field). Radio frequencies from the sample are emitted to return to its ground state after the external radiofrequency pulse excited its nuclei. So, both of them exist, but I don't understand what happened with the detector? Is induced current passes through the coil to the detector then it sends the signal to the software as FID? OR the radio frequencies that are emitted then the detector collects them and sends them directly to the software? and if any of them happen what do we use the other?

I'm currently working on a batch type gas phase photocatalytic reaction. For product analysis, i draw the gas samples from the reactor using a gas tight syringe and then inject directly into the GC column (GC TCD/FID) through septum. As for now, I'm using 0.5ml of gas samples, but i found that there is poor data reproducibility and the signal for CO peak is too strong for both TCD and FID throughout reaction period. I'm aware that FID should not detect CO but in my case the signal for CO is HUGE! However, I'm getting good results for other gas products such as H2, C2H6 and C2H4. I suspect the volume of gas sample could be one of the reasons, therefore if anyone have experience in analyzing gas samples by manually injecting into GC, please share your thoughts. Thanks in advance.

Recently our GC/FID has been having troubles igniting its flame. So far I have checked the air gas line leading into the machine, trimmed the back column going into the detector, and cleaned the jet via the sonication procedure.

The orange ignition source is still visible so that is not the problem. Also, we are able to ignite it if we gently blow on the igniter and the FID stays lit without a problem until it goes back into standby mode.

Any insight into this problem would be appreciated!

Dear Friends,

I'm looking for a polymer soluble in 1-pentanol in room temperature and after drying also smooth and hard (not sticky) and simultaneously insoluble in lower alcohol like a methanol, ethanol and 1,2-propanadiol.

I arleady tried with synthesis of statistic copolymers build with methyl and butyl methacrylates, and I obtained polymers soluble in 1-pentanol but in 60-70 C degrees not in room temperature.

I will be grateful for any tips.

With regards,

Tom

I'm searching for articles about isomerism of cumulene alcohols under any conditions. I was trying to search it with SciFinder and Reaxys, and I've found only 1 article about cumulene alcohol, but it was not about the isomerism. I would be much appreciated if anyone would find any relevant article.