Designation:D1159−07(Reapproved2012)Designation:130/98StandardTestMethodforBromineNumbersofPetroleumDistillatesandCommercialAliphaticOlefinsbyElectrometricTitration1ThisstandardisissuedunderthefixeddesignationD1159;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thistestmethod2coversthedeterminationofthebrominenumberofthefollowingmaterials:1.1.1Petroleumdistillatesthataresubstantiallyfreeofmateriallighterthanisobutaneandthathave90%distillationpoints(byTestMethodD86)under327°C(626°F).Thistestmethodisgenerallyapplicabletogasoline(includingleaded,unleaded,andoxygenatedfuels),kerosine,anddistillatesinthegasoilrangethatfallinthefollowinglimits:90%DistillationPoint,°C(°F)BromineNumber,max2Under205(400)175205to327(400to626)101.1.2Commercialolefinsthatareessentiallymixturesofaliphaticmono-olefinsandthatfallwithintherangeof95to165brominenumber(seeNote1).Thistestmethodhasbeenfoundsuitableforsuchmaterialsascommercialpropylenetrimerandtetramer,butenedimer,andmixednonenes,octenes,andheptenes.Thistestmethodisnotsatisfactoryfornormalalpha-olefins.NOTE1—Theselimitsareimposedsincetheprecisionofthistestmethodhasbeendeterminedonlyuptoorwithintherangeofthesebrominenumbers.1.2Themagnitudeofthebrominenumberisanindicationofthequantityofbromine-reactiveconstituents,notaniden-tificationofconstituents;therefore,itsapplicationasameasureofolefinicunsaturationshouldnotbeundertakenwithoutthestudygiveninAnnexA1.1.3Forpetroleumhydrocarbonmixturesofbrominenum-berlessthan1.0,amoreprecisemeasureforbromine-reactiveconstituentscanbeobtainedbyusingTestMethodD2710.Ifthebrominenumberislessthan0.5,thenTestMethodD2710orthecomparablebromineindexmethodsforindustrialaromatichydrocarbons,TestMethodsD1492orD5776mustb...
