The determination of hydrocarbon impurities contained in toluene and mixed xylenes used as chemical intermediates and solvents is typically required. This test is suitable for setting specifications and for use as an internal quality control tool where aromatic monocyclic hydrocarbons are produced or are used. This test method is applicable for determining the impurities from the aromatic hydrocarbon production process. Typical impurities are alkanes containing 1 to 10 carbon atoms, benzene, toluene, ethylbenzene (EB), xylenes, and aromatic hydrocarbons containing nine carbon atoms.
Refer to Test Methods D3797, D4492, and D7504 for determining the purity of o-Xylene, p-Xylene, and benzene.
Refer to Test Method D6563 or D7504 for determining the C8 aromatic hydrocarbon distribution in mixed xylenes.
Purity is commonly reported by subtracting the determined expected impurities from 100.00. However, a gas chromatographic analysis cannot determine absolute purity if unknown or undetected components are contained within the material being examined.
Detector | Flame ionization |
Column: | |
Tubing | fused silica |
Stationary phase | crosslinked polyethylene glycolA |
Film thickness, x03BC; | 0.25 |
Length, m | 60 |
Diameter, mm | 0.32 ID |
Temperatures: | |
Injector, x00B0;C | 270 |
Detector, x00B0;C | 300 |
Oven: | |
Initial, x00B0;C | 60 |
Time 1, min | 10 |
Final, x00B0;C | 150 |
Rate, x00B0;C/min | 5 |
Time 2, min | 10 |
Carrier gas | helium |
Flow rate, mL/min | 1.0 |
Split ratio | 100:1 |
Sample size,
ASTM D2360-2011 中可能用到的仪器设备
Copyright ©2007-2022 ANTPEDIA, All Rights Reserved |