StationaryPhases
47
Component
Normal boilingpoint,
C
Raw refineryC5 cut
(approx. average)
%mass
C4hydrocarbons
- - -
1.88
isopentan
27.85
45.76
1-pentene (
-amylene)
29.97
5.37
n
-pentane
36.07
8.36
isoprene
34.07
0.25
2-pentene (
-amylene)
36.07 (trans) ; 36.94 (cis)
12.58
piperylenes
42.0 (trans) ; 44.0 (cis)
0.65
isoamylenes
31.16 (2-methyl-1-butene) ;
38.57 (2-methyl-2-butene) ;
20.1 (3-methyl -1-butene)
7.26
12.06
1.34
cyclopentene
44.24
2.33
C5+hydrocarbons
- - -
2.16
Specificweight (
d
15 15
)
- - -
6.652
Table 9. CompositionofC5 fractions andboilingpoints ofmainC5hydrocarbons
14. Analysisof natural products
Gas chromatography coupled with MS represents a fast and cheap method for the
separation and identification of compounds from natural product mixtures. Alkylation of
animal fats and vegetable oils for biofuel fabrication is one of the industrial processes that
needs analysis of natural products, both for rawmaterials and for products (Christie, 1989).
Fig. 3. Separationof the fattyacids (methyl esters) of pig testis ona fused silica column (25
mx 0.22mm) coatedwithCarbowax 20M™ (ChrompakUK).
