Standard Test Method for Trace Impurities in Monocyclic Aromatic Hydrocarbons by Gas Chromatography and External Calibration

Importancia y uso:

5.1 Determining the type and amount of hydrocarbon impurities remaining from the manufacture of toluene, mixed xylenes, and p-xylenes used as chemical intermediates and solvents is often required. This test method is suitable for setting specifications and for use as an internal quality control tool where these products are produced or are used. Typical impurities are: alkanes containing 1 to 10 carbons atoms, benzene, toluene, ethylbenzene (EB), xylenes, and aromatic hydrocarbons containing nine carbon atoms.

5.2 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.

Subcomité:

D16.01

Referida por:

D5136-19, D5211-19, D7504-23

Volúmen:

06.04

Número ICS:

71.040.50 (Physicochemical methods of analysis), 71.080.15 (Aromatic hydrocarbons)

Palabras clave:

aromatics; external standard; gas chromatography; impurities; purity; p-xylene; toluene; xylenes;