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ASTM International, 11/01/2012
Publisher: ASTM
File Format: PDF
$26.00$52.00
Published:01/11/2012
Pages:3
File Size:1 file , 72 KB
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1.1 This practice covers, by compositional analysis, the approximate determination of the following physical characteristics of commercial propane, special-duty propane, commercial propane/butane mixtures, and commercial butane (covered by Specification D1835): vapor pressure, relative density, and motor octane number (MON).
1.1.1 This practice is not applicable to any product exceeding specifications for nonvolatile residues. (See Test Method D2158.)
1.1.2 For calculating motor octane number, this practice is applicable only to mixtures containing 20 % or less of propene.
1.1.3 For calculated motor octane number, this practice is based on mixtures containing only components shown in Table 1.
Component
Vapor Pressure Blend Factor, kPa-gage (PSIG) at 37.8°C (100°F)
Relative Density at 15.6°C (60°F)
MON Blend Value
Methane
17547 (2545)
0.3
. . .
Ethane
4213 (611)
0.3563
100.7
Ethene (Ethylene)
8720 (1265)
0.37
75.6
Propane
1200 (174)
0.5072
97.1
Propene (Propylene)
1466 (213)
0.5226
84.9
Methylpropane (Isobutane)
400 (58)
0.5629
97.6
n-Butane
255 (37)
0.5842
89.6
t-2-Butene
242 (35)
0.6099
…
1-Butene
328 (48)
0.6004
80.8
2-Methylpropene (Isobutylene)
340 (49)
c-2-Butene
216 (31)
0.6275
83.5
2,2-Dimethylpropane (Neopentane)
152 (22)
0.5961
80.2
Cyclopentane
-33 (-4.7)
0.7503
2-Methylbutane (Isopentane)
40 (5.8)
0.6251
90.3
n-Pentane
6.4 (0.9)
0.6307
62.6
n-Hexane
-67 (-9.7)
0.6641
26.0
1.2 The value
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