Standard Test Method for Trace Carbonyl Sulfide in Propylene by Gas Chromatography

Importancia y uso:

5.1 In processes producing propylene, COS usually remains with the C₃ hydrocarbons and must be removed, since it affects product quality. COS acts as a poison to commercial polymerization catalysts, resulting in deactivation and costly process downtime.

5.2 Accurate gas chromatographic determination of trace COS in propylene involves unique analytical problems because of the chemical nature of COS and idiosyncracies of trace level analyses. These problems result from the reactive and absorptive nature of COS, the low concentration levels being measured, the type of detector needed, and the interferences from the propylene sample matrix. This test method addresses these analytical problems and ways to properly handle them to assure accurate and precise analyses.

5.3 This test method provides a basis for agreement between two laboratories when the determination of trace COS in propylene is important. The test method permits several calibration techniques. For best agreement between two labs, it is recommended that they use the same calibration technique.

Subcomité:

D02.D0.03

Volúmen:

05.02

Número ICS:

71.080.10 (Aliphatic hydrocarbons)

Palabras clave:

carbonyl sulfide; flame photometric detector; gas chromatography; propylene;