Gas Chromatography: Hydrocarbon Gas Analysis By Ryan Waters November 20, 2006
Presentation Path Equipment Objective of Lab Calibration Chromatographs Unknown Chromatograph Results Conclusions Q&A
Equipment
Objective Find the composition of an unknown hydrocarbon gas. Knowing some combination of: Methane Ethane Propane Butane
Calibration: Methane 0. 42
Calibration (cont.): Ethane 2. 73
Calibration (cont.): Propane 3. 31
Calibration (cont.): Butane 13.05
Average Retention Times Methane 0.34 ± 0.22 min. (confidence level 95%) Ethane 2.5 ± 0.62 min. (confidence level 95%) Propane 3.7 ± 1.1 min. (confidence level 95%) Butane 12.3 ± 1.3 min. (confidence level 95%)
Unknown Chromatograph Co-elution
Results Methane Co-elutes with Air Accurate measurement not possible. Propane 32 ± 21% (confidence level 95%) Butane 56 ± 46% (confidence level 95%)
Conclusion/Recommendations Run lower temperatures to eliminate co- eluting. Check baseline. Run unknown more.
References Mark Barnes, Gas Chromatography: The Modern Analytical Tool, 207/GasChroma-Fig2.jpg Agilent Technologies, What is Gas Chromatography?, tm
Questions