420
Appendix: Fuel Properties
APPeNDix 1
Fuel Properties
Property
Gasoline
No. 2
Diesel Fuel Methanol Ethanol
MTBE
Propane
CNG
Hydrogen
Biodiesel
Chemical formula
C
4 –C
12
C
3 –C
25
CH
3 OH
C
2 H
5 OH (CH
3 )
3 COCH
3
C
3 H
8
CH
4 (83–99%)
C
2 H
6 (1–13%)
H
2
C
12 –C
22 FAME
Molecular weight
100–105
200
32.04
46.07
88.15
44.1
16.04
2.02
~292
Composition, weight %
Carbon
85–88
87
37.5
52.2
68.1
82
75
0
77
Hydrogen
12–15
30
12.6
13.1
13.7
18
25
100
12
Oxygen
0
0
49.9
34.7
18.2
—
0
11
Specific gravity,
15.5°C/15.5°C
0.72–0.78
0.85
0.796
0.794
0.744
0.508
0.424
0.07
0.88
Density, kg/m 3
@
15.5°C
719–779
848
795
735
742
506
128
—
878
Boiling
temperature, °C
27–225
180–340
65
78
55
–42
–164 to –88
–253
315–350
Reid vapor
pressure, bar
0.55–1.03
<0.01
0.32
0.16
0.54
14.34
166
—
<0.01
Research octane
number.
88–98
—
107
108
116
112
—
130+
—
Motor octane number.
80–88
—
92
92
101
97
—
—
—
(R + M)/2
86–94
—
100
100
108
104
120+
Cetane number.
—
40–55
0–54
48–65