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1、302J.Chem.Eng.Data1080,25,302-305VaporPressureMeasurementsofDiphenylmethane,Thianaphthene,andBicyclohexylatElevatedTemperaturesStefanA.WleczorekandRlklKobayashl"DepartmentofChemicalEngineering,WilliamMarshRiceUniversw,Houston,Texas77001Thetemperatureofthe
2、bathwasthenIncreasedtothere-Inthispaperwepresentthevaluesofvaporpressureatquiredvalue,thespacebetweenvalves2and4and4,9,andelevatedtemperaturefordiphenylmethane(424.64-648.2511evacuated,thepressureonbothsidesofthediaphragmK),thlanaphthene(424.40-630.60K),a
3、ndbicyclohexylequalized(valves2,3,and11closedand4and9open),and(424.25-577.25K).Ahlgh-temperaturestatlcapparatusthenullpositionofthedifferentialpressurenullindicatoradjusted.hasbeenusedforthemeasurements.TheexperimentalThisprocedurewasrepeatedforeachvaporp
4、ressuremea-dataofvaporpressureshavebeenflttedtoChebyshevsurement.polynomials.Thevaluesofdp/dToverthetemperatureThetemperatureneartheequilibriumcellwasmeasuredinrangesInvestigatedarereported.IPTS-68withanaccuracyoffO.O1KbymeansofaLeedsandNorthrupplatinumre
5、sistancethermometer.ThemeasurementofpressurewascarrledoutwithahighIntroductiontemperatureRwkadifferentialpressurenulldetectorandagaslubricateddeadweightgaugeModel2465.TherelationshipbetweentemperatureandvaporpressureTheoverallaccuracyofthepressuremeasurem
6、entisesti-hasinterestedscientistsformanyyears.Thepresentinves-matedtobe0.015%ofthemeasuredvalue.tigationswereundertakenforheaviermolecules,forwhichthermodynamicpropertiesarevirtuallyunknown,especiallyatResuttsandDlscusslonhightemperatures.Oneofthemostimpo
7、rtantbasicpropertiesofacompoundisitsvaporpressure.ThisinvestigationwasBecausethevaporpressuresofcompoundsweremeasuredundertakentoobtaindataonthevaporpressuresofdi-athightemperatures,atwhichmostofthesesubstancesarephenylmethane,thianaphthene,andbicyclohexy
8、loverawideunstable,wetookspecialcaretoestablishwhenthermalin-rangeoftemperaturesuptotheirconditionsofinitialthermalstabilitybegan.Theprocedureusedinthesemeasurementsdecomposition.Presentlyonlyafewexperimentaldataofv
