ASTM-D5303 › Historical Revision Information
Standard Test Method for Trace Carbonyl Sulfide in Propylene by Gas Chromatography
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Scope
1.1 This test method covers the determination of traces of carbonyl sulfide (COS) in propylene. It is applicable to COS concentrations from 0.5 to 4.0 mg/kg (parts per million by mass). See Note 1.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific hazards statements are given in Section 8.
Significance and Use
4.1 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.
4.2 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.
4.3 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.
Keywords
carbonyl sulfide; flame photometric detector; gas chromatography; propylene; ICS Number Code 71.080.10 (Aliphatic hydrocarbons)
To find similar documents by ASTM Volume:
05.02 (Petroleum Products and Lubricants (II): D3711 - D6122)
To find similar documents by classification:
71.080.10 (Aliphatic hydrocarbons)
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Document Number
ASTM-D5303-92(2012)
Revision Level
1992 R12 EDITION
Status
Superseded
Modification Type
Reapproval
Publication Date
Dec. 1, 2012
Document Type
Test Method
Page Count
6 pages
Committee Number
D02.D0.03