Gas Chromatography - GC Columns > Column Packing > Page 25


1. 2,2-Dimethylpentane 14.2,2,3-Trimethylpentane
2..2,4-Dimethylpentane 15.3,3-Dimethylhexane
3. 2,3,3-Trimethylbutane 16.2,3,4-Trimethypentane
4. 3,3-Dimethylpentane 17.2,3-Dimethylhexane
5.2-Methylhexane 18. 2-Methylheptane
6. 2,3-Dimethylpentane 19.2-Methyl-3-ethyl-pentane
7.3-Methylhexane 20.2,3,3-Trimethylpentane
8.3-Ethylpentane 21.4-Methylheptane
9.2,3,4-Trimethylpentane 22.3-Methylheptane
10.n-Heptane 23.3-Ethylheptane
11.2,2-Dimethylhexane 24. 2,4-Dimethylhexane
12.2,5-Dimethylhexane 25.#-Methyl-2-ethylpentane
13.2,4-Dimethylhexane 26.n-Octane

The column temperature was 78.6˚C, and the column packing 2.5w/w Apiezon Oil on C22 firebrick 100-120 mesh. The column diameter was 2 mm, the inlet pressure 200 p.s.i., and the column efficiency 30,000 theoretical plates. The argon detector was used and the sample weight was 20 mg.

Figure 12. Chromatogram from a 50 ft Column Showing the Separation of the Isomeric Heptanes and Octanes