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Part of analysis for gas chromatography

Submitted by daniellam on Tue, 11/14/2017 - 11:20

Based on the gas chromatography/mass spectroscopy data, it is seen that the experiment with the simple distillation of the first sample (2nd fraction) shows a higher percent area for toluene (36.74%) compared to the fractional distillation of toluene (25.62%), suggesting that the fractional distillation went much better. This means that during the distillation, not only cyclohexane was distilled, but also some toluene.  For fractional distillation, the packing allowed a higher ratio of cyclohexane to vaporize while both of them condensed onto the copper column.  This creates better separation between the two compounds.  Similarly, for the second sample (2nd to last fraction) that was taken for simple distillation, the GC/MS shows that there is very little cyclohexane (6.14%) while the majority is toluene (93.86%).  However, fractional distillation had a much better separation since the remainder of cyclohexane (1.49%) is miniscule to toluene (98.51%).  Though most of the cyclohexane was separated from the toluene, the two compounds could not be completely separated from both simple and fractional distillation.  Fractional distillation is better for separation than simple distillation because of this packing.

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