Hi, I’ve got a work related question. I have to check our produced technical alcohol using GC. Two of the components of my calibration are ethyl butyrate and 1-Propanol. Ethyl butyrate has a boiling point of about 120°C and 1-Propanol 97°C. But ethyl butyrate peaks first? I’ve run them separately too…but shouldn’t it be the other way around? Thanks In advance :)

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[deleted] t1_iswe0bv wrote on October 19, 2022 at 4:38 AM

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[deleted] t1_isweji8 wrote on October 19, 2022 at 4:43 AM

#139,812

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[deleted] t1_iswfzra wrote on October 19, 2022 at 4:58 AM

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[deleted] t1_iswg9dc wrote on October 19, 2022 at 5:01 AM

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ChemistDude t1_iswgksv wrote on October 19, 2022 at 5:05 AM

#139,910

If you’re using a fairly polar column it’s possible. n-Propanol has a fairly exposed hydroxy group. On a DB-WAX column, it elutes after ethyl propionate (closest compound to ethyl butyrate I could find data for). Here’s a list of typical retention times for various phases.

https://www.chem-agilent.com/cimg/Solvent-Retention-Data_b-0292.pdf