Designation:D4650−14StandardSpecificationforNormalButaneThermophysicalPropertyTables1ThisstandardisissuedunderthefixeddesignationD4650;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thethermophysicalpropertytablesfornormalbutaneareforuseinthecalculationofthepressure-volume-temperature(PVT),thermodynamic,andtransportpropertiesofnormalbutaneforprocessdesignandoperations.Twotablesprovidepropertiesattheconditionsofliquid-vaporequilibrium(saturationproperties),oneforliquidandoneforvapor,attemperaturesbetween135Kandthecriticalpoint,425.13K.AthirdtableprovidespropertiesatselectedT,ppointsfortheequilibriumphaseattemperaturesbetween140Kand560Katpressuresto20MPa.ThetablesweredevelopedusingtheNationalInstituteofStandardsandTechnologyStandardRef-erenceDatabaseproductREFPROP,version9.1.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.2.Applicability2.1Thesetablesapplydirectlyonlytopurenormalbutane.Theymayalsobeusedinmathematicalmodelsandtablesforthethermophysicalpropertiesofmixturescontainingnormalbutane.3.Tables3.1Thesetableswereproducedbyequationsfromacom-puterpackage,“NISTStandardReferenceDatabase23;Ref-erenceFluidThermodynamicandTransportPropertiesData-base(REFPROP):Version9.1.”2Awideselectionofunits(SIunits,engineeringunits,chemicalunits)andadditionalprop-ertiesareavailablewiththisprogram.3.2Thesethermophysicalpropertytablesare:3.2.1ThermophysicalPropertiesofNormalButaneLiquidatVapor-LiquidEquilibrium,inSIunits.SeeTable1.3.2.2ThermophysicalPropertiesofNormalButaneVaporatVapor-LiquidEquilibrium,inSIunits.SeeTable2.3.2.3ThermophysicalPropertiesofNormalButaneAlongIsobars,inSIunits.SeeTable3.3.3Thesymbolsare:T,temperature(K)ρ,molardensity(mol·L-1)H,molarenthalpy(J·mol-1)S,molarentropy(J·K-1·mol-1)...
