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Crude oil composition analysis up to C35

bijishnair

We currently use Agilent 7890A GC with S/SL injector and FID detector using a capillary column for the analysis of crude oil composition upto C35.  The remaining compounds will be reported as C36+. The temperature program is from 30 Deg to 325 Deg, We run a few blanks before injecting crude oil sample for subtracting the baseline. Because of the heavy ends in the samples, we never get consistent baseline for the blank. Is there a better configuration for this type of analysis. Currently we replace the columns very frequently.

Do we need to replace the S/SL injector with any other type?

Is it possible to have a pre-column and additional EPC to backflush the heavy ends beyond C35?

Please look into the matter and provide an alternative. 

Thanks

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    Yep - what ISH said. You've basically got a Detailed Hydrocarbon Analyser (DHA), but you likely want the front-end analysis too so you might need a DHA / Simdis merge. These are specialist applications built on Agilent hardware and AC by PAC are Agilent channel partners who specialise in this stuff. You'll get bespoke hardware and software to make naming the multitude of peaks in a crude sample more manageable (because there's a LOT). 

    But in principle, you want an inlet which is temperature programmable, like AC's TPI, and a back flush to capture the heavies and send them to vent ant not on to your analytical column.  

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  • 0

    Yep - what ISH said. You've basically got a Detailed Hydrocarbon Analyser (DHA), but you likely want the front-end analysis too so you might need a DHA / Simdis merge. These are specialist applications built on Agilent hardware and AC by PAC are Agilent channel partners who specialise in this stuff. You'll get bespoke hardware and software to make naming the multitude of peaks in a crude sample more manageable (because there's a LOT). 

    But in principle, you want an inlet which is temperature programmable, like AC's TPI, and a back flush to capture the heavies and send them to vent ant not on to your analytical column.  

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