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ASTM D2650

ASTM D2650 – Standard Test Method for Chemical Composition of Gases by Mass Spectrometry

Description:

Significance and Use

5.1 A knowledge of the composition of refinery gases is useful in diagnosing the source of plant upsets, in determining the suitability of certain gas streams for use as fuel, or as feedstocks for polymerization and alkylation, and for monitoring the quality of commercial gases.

Scope

1.1 This test method covers the quantitative analysis of gases containing specific combinations of the following components: hydrogen; hydrocarbons with up to six carbon atoms per molecule; carbon monoxide; carbon dioxide; mercaptans with one or two carbon atoms per molecule; hydrogen sulfide; and air (nitrogen, oxygen, and argon). This test method cannot be used for the determination of constituents present in amounts less than 0.1 mole %. Dimethylbutanes are assumed absent unless specifically sought.

Note 1: Although experimental procedures described herein are uniform, calculation procedures vary with application. The following influences guide the selection of a particular calculation: qualitative mixture composition; minimum error due to components presumed absent; minimum cross interference between known components; maximum sensitivity to known components; low frequency and complexity of calibration; and type of computing machinery.

Because of these influences, a tabulation of calculation procedures recommended for stated applications is presented in Section 12 (Table 1).

Serial No. . . . . . . . . . .78910111213
Name or ApplicationCommercial
Propane
Commercial
Butane
BB Stream
(Cracked
Butanes)
Dry Gas
Cracked
Fuel Gas
Mixed Iso
and Normal
Butanes
Reformer
Make-Up
Gas
Unstabi-
lized Fuel
Gas
ComponentOPMOPMOCPCMOPMOPMOPMOCPCM
Hydrogen………………………15 2M………10 2M16 2M
Methane………………………1416M……… 916M1516M
EthyleneE726M………………1226M………………1326M
Ethane630M………………1130M……… 730M1230M
Propene542M742M642M1042M……………… 842M
Propane344M444M444M 744M344M 544M 644M
Butadiene………………154M 354M……………… 254M
Butene-1156M156M741M 1…………………… 941M
Butene-2156M156M856M 156M………………1056M
Isobutene1FFM1FF939M 1F…443M………1139M
Isobutane443M543M543M 843M158M 643M 743M
n-Butane258M258M258M 458M……… 258M 358M
Pentenes………670MG70U 970M……… 357M…70U
Isopentane………357M357M 557M257M 472M 457M
n-Pentane……………………… 672M……………… 572M
Benzene………………………………………………HHD
Hexanes………………………………………………HHD
C6 cyclic paraffins………………………………………………HHD
Hexanes………………………………………………HHD
Toluene………………………………………………HHD
Hydrogen sulfide………………………I…C………IICIIC
Carbon dioxide………………………I…C………IICIIC
Carbon monoxide………………………1328M……… 828M1428M
Nitrogen………………………………………………………
Air……………………… 232M……… 132M 132M
Acid Gases………………………I…C………IICIIC
ResidualE827M827M1027M1614M527M1114M1714M
ResidualE929M929M1129M1715M629M1215M1815M
ResidualE………………………1827M………1327M1927M
ResidualE………………………1929M………1429M2029M
Serial No. . . . . . . . . . .141516
Name or ApplicationH2-C6 Cracked GasH2-C6 Straight Run GasLight Refinery Gas
ComponentOPMOPMOPM
Hydrogen 1 2M 1 2M20 2U
Methane 216M 216M1716M
Ethylene 426M………1426M
Ethane 730M 530M1330M
Propene1142M………1242M
Propane 629M 429M1029M
Butadiene1554M………………
Butane-1………………1156M
Butene-21656M………………
Isobutene………………………
Isobutane1243M 943M 943M
n-Butane1858M1458M 858M
Pentenes2170M………1570M
Isopentane1757M1357M 757M
n-Pentane2272M1872M 672M
Benzene………1978M 578U
Hexanes2384M……… 484U
C6 cyclic paraffins………2084M………
Hexanes………1771M 386U
Toluene………2192M………
Hydrogen sulfide 934M 734M 134U
Carbon dioxide1344M1044M1644U
Carbon monoxide………………1812U
Nitrogen 528M………1928U
Air 832M 632M 232U
Water 318M 318M………
Cyclobutane………1256M………
Cyclopentene2067M………………
Pentadienes2067M………………
Cyclopentane………1670M………
Methylmercaptan1448M1148M………
Ethylmercaptan1962M1562M………
Residual 411041M 841M………
Residual 142414M2214M………

Note 2: This test method was developed on Consolidated Electrodynamics Corporation Type 103 Mass Spectrometers. Users of other instruments may have to modify operating parameters and the calibration procedure.

1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

Related Test Methods

ASTM D4865

ASTM D4860

ASTM D4857

ASTM D4850

ASTM D4839

ASTM D4833

ASTM D483

ASTM D4829

ASTM D4828

ASTM D4824

ASTM D482

ASTM D4815

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