Geology Reference
In-Depth Information
Terpenoids and
partially condensed aromatics
A
Lignite
North Dakota
DECS-11
UCM
Unresolved Complex Mixture
UCM
Terpenoid sand
plant waxes
Plant waxes
n
-C
25
to
n
-C
(odd > even)
B
Subbituminous A
Wyoming
DECS-27
Alkylated PAHs
Alkylated PAHs and
plant waxes
N1
C
N2
N3
High-volatile bituminous
Colorado
DECS-33
N4
Homologous series of polymerized
normal alkanes
D
Normal Alkanes
n
-C
8
to
n
-C
40
+
Medium-volatile bituminous
Colorado
DECS-3
Devolatilized semivolatile hydrocarbons
with some cracked alkylated benzene residues
Alkylated
benzenes
E
Anthracite
Pennsylvania
DECS-21
Retention time
Figure 11.3.1. GC/FID chromatograms of extractable hydrocarbons in selected coals by increasing rank: (A)
Lignite (DECS-11) contained terpenoids, partially condensed aromatics and many other compounds,
(B)
subbituminous coal
(DECS-27) contained terpenoids plus plant waxes (normal alkanes eluting between
approximately
-C
36
with a preference for odd over even number of carbons), (C) high-volatile
bituminous coal (DECS-33) contains more aromatic and saturated hydrocarbons from geochemical
polymerization, (D) medium-volatile bituminous coal (DESC-3) contains a homologous series of normal
alkanes, and (E) anthracite contains relatively simplistic mixture of lighter aromatics. From Stout and Emsbo-
Mattingly 2008.
n
-C
25
and
n
