Designation:D2597−10StandardTestMethodforAnalysisofDemethanizedHydrocarbonLiquidMixturesContainingNitrogenandCarbonDioxidebyGasChromatography1ThisstandardisissuedunderthefixeddesignationD2597;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoverstheanalysisofdemethanizedliquidhydrocarbonstreamscontainingnitrogen/airandcarbondioxide,andpurityproducts,suchasanethane/propanemixthatfallwithinthecompositionalrangeslistedinTable1.Thistestmethodislimitedtomixturescontaininglessthan5mol%ofheptanesandheavierfractions.1.2Theheptanesandheavierfractions,whenpresentinthesample,areanalyzedbyeither(1)reverseflowofcarriergasaftern-hexaneandpeakgroupingor(2)precutcolumntoeluteheptanesandheavierfirstasasinglepeak.Forpuritymixeswithoutheptanesandheavier,noreverseofcarrierflowisrequired.(Caution—InthecaseofsampleswitharelativelylargeC6+orC7+fractionandwherepreciseresultsareimportant,itisdesirabletodeterminethemolecularweight(orotherpertinentphysicalproperties)ofthesefractions.Sincethistestmethodmakesnoprovisionfordeterminingphysicalproperties,thephysicalpropertiesneededcanbedeterminedbyanextendedanalysisoragreedtobythecontractingparties.)1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.NOTE1—AnnexA2statesvaluesinmanometricunits,whicharetoberegardedasthestandardinthatsection.ApproximateSIunits(fromconversion)aregiveninparentheses.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.ForspecifichazardstatementsseeAnnexA3.2.ReferencedDocuments2.1ASTMStandards:2D1265PracticeforSamplingLiquefiedPetroleum(LP)Gases,Man...
