1. Gas Chromatography: Hydrocarbon Gas Analysis By Ryan Waters November 20, 2006

2. Presentation Path Equipment Objective of Lab Calibration Chromatographs Unknown Chromatograph Results Conclusions Q&A

3. Equipment

4. Objective Find the composition of an unknown hydrocarbon gas. Knowing some combination of: Methane Ethane Propane Butane

5. Calibration: Methane 0. 42

6. Calibration (cont.): Ethane 2. 73

7. Calibration (cont.): Propane 3. 31

8. Calibration (cont.): Butane 13.05

9. 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%)

10. Unknown Chromatograph 0.28 3.32 8.1614.12 Co-elution

11. Results Methane Co-elutes with Air Accurate measurement not possible. Propane 32 ± 21% (confidence level 95%) Butane 56 ± 46% (confidence level 95%)

12. Conclusion/Recommendations Run lower temperatures to eliminate co- eluting. Check baseline. Run unknown more.

13. References Mark Barnes, Gas Chromatography: The Modern Analytical Tool, http://www.practicingoilanalysis.com/backup/200 207/GasChroma-Fig2.jpg Agilent Technologies, What is Gas Chromatography?, http://www.chem.agilent.com/cag/cabu/whatisgc.h tm

14. Questions