ASTM_D_5303_-_20.pdf

Designation:D530320Standard Test Method forTrace Carbonyl Sulfide in Propylene by GasChromatography1This standard is issued under the fixed designation D5303;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This test method covers the determination of traces ofcarbonyl sulfide(COS)in propylene.It is applicable to COSconcentrations from 0.5 mg kg to 4.0 mg kg(parts per millionby mass).See Note 1.NOTE1The lower limit of this test method is believed to be below0.1 mg kg,depending on sample size and sensitivity of the instrumenta-tion being used.However,the cooperative testing program was conductedin the 0.5 to 4.0 range due to limitations in preparing commercial testmixtures.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.Specific hazards statements are given in Section 9.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1835 Specification for Liquefied Petroleum(LP)GasesD3609 Practice for Calibration Techniques Using Perme-ation TubesD4468 Test Method for Total Sulfur in Gaseous Fuels byHydrogenolysis and Rateometric ColorimetryE355 Practice for Gas Chromatography Terms and Relation-shipsE840 Practice for Using Flame Photometric Detectors in GasChromatography3.Terminology3.1 Definitions:3.1.1 Additional terminology related to the practice of gaschromatography can be found in Practice E355.3.1.2 liquefied petroleum gas(LPG),nhydrocarbon gasesthat can be stored or handled in the liquid phase throughcompression or refrigeration,or both.3.1.2.1 DiscussionLPGs generally consist of C3and C4alkanes and alkenes or mixtures thereof and containing lessthan 10%by volume of higher carbon number material.Vaporpressure does not normally exceed 2000 kPa at 40 C.3.2 Definitions of Terms Specific to This Standard:3.2.1 propane/propene mixtures,nmixtures primarilycomposed of propane and propene where one of these compo-nents is usually in the concentration range of 30%to 85%bymass with the other comprising the majority of the remainder.Commercial Propane in Specification D1835 is typically thissort of product mixture.3.2.1.1 DiscussionOther components may be present,usually at less than 10%by mass.4.Summary of Test Method4.1 A procedure is given for removing a sample from thesample cylinder,separating COS from propylene,detectingCOS,calibrating the detector,quantitating COS content in thesample,and assaying the gas standard.General comments andrecommended techniques are given.4.2 Arelatively large volume of sample is injected into a gaschromatograph having a single packed column,operated iso-thermally at 10 C to 50 C,that separates COS from propyl-ene.COS is detected with a flame photometric detector.4.3 Calibration data,based on peak areas,are obtained usinga known gas standard blend of COS in the range expected forthe sample.The COS peak area in the sample is measured andthe concentration of COS calculated.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.D0.03 on Propylene.Current edition approved July 1,2020.Published July 2020.Originally approvedin 1992.Last previous edition approved in 2019 as D5303 19.DOI:10.1520/D5303-20.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.4.4 The COS gas standard blend is assayed prior to use forcalibration.5.Significance and Use5.1 In processes producing propylene,COS usually remainswith the