ASTM_D_2712_-_20.pdf

Designation:D271220Standard Test Method forDetermination of Hydrocarbon Impurities in High PurityPropylene by Gas Chromatography1This standard is issued under the fixed designation D2712;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 is used for the determination ofhydrocarbon impurities in propylene(propene)material of97%by mass or greater purity(concentrates).These impuritiesare determined in the concentration range of 0.35 mg kg to8575 mg/kg and includes the following components:methane,ethane,ethylene,propane,acetylene,isobutane,propadiene,normal butane,trans-2-butene,butene-1,isobutylene,cis-2-butene,isopentane,methylacetylene,normal pentane,and1,3-butadiene.NOTE1Optionally,the analysis may include the determination ofpentenes/hexanes and heavier components,see 6.3.1.2 This test method does not determine non-hydrocarbonimpurities,and additional tests may be necessary to fullycharacterize the propylene sample.However,for the purposesof this test,the purity of propylene is determined as thedifference between the total of the determined analytes and100%(by difference).1.3 When this test method is being used for the determina-tion of trace level impurities in high-purity propylene,the useof this test method for the analysis of propylene samples atlower purities is not recommended due to the potential forcross contamination between samples.1.4 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.5 This standard may involve hazardous materials,operations,and equipment.This standard does not purport toaddress all of the safety concerns,if any,associated with itsuse.It is the responsibility of the user of this standard toestablish appropriate safety,health,and environmental prac-tices and determine the applicability of regulatory limitationsprior to use.1.6 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:2D1265 Practice for Sampling Liquefied Petroleum(LP)Gases,Manual MethodD1835 Specification for Liquefied Petroleum(LP)GasesD3700 Practice for Obtaining LPG Samples Using a Float-ing Piston CylinderE355 Practice for Gas Chromatography Terms and Relation-shipsF307 Practice for Sampling Pressurized Gas for Gas Analy-sis3.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.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 on Hydrocarbons for Chemical and Special Uses.Current edition approved July 1,2020.Published July 2020.Originally approvedin 1968.Last previous edition approved in 2018 as D2712 18a.DOI:10.1520/D2712-20.2For 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.Summary of Test Method4.1 An LPG phase sample is analyzed as received via eithergas or liquid sampling valves into a gas chromatograph.Thegas chromatograph is pr