ABSTRACT

Vapour pressure of 2-methyl-biphenyl, 3-methyl-biphenyl, 4,4'-di-methyl-biphenyl, 3-isopropyl- biphenyl, 3-tert-butyl-biphenyl and 4,4'-di-tert-butyl-biphenyl were measured by the transpiration method. Vapour pressure of 3-iso-propyl-biphenyl, 3-tert-butyl-biphenyl and 4-tertbutyl-biphenyl measured by ebulliometry. Equations for temperature dependences of the saturated vapour pressures were derived. Molar standard enthalpies of vaporization at the reference temperature were calculated from temperature dependences of vapour pressures. Additionaly, enthalpies of vaporization of 3-iso-propyl-biphenyl were directly measured in the temperature range from 323 to 373 K using an isothermal heat conducting Calvet microcalorimeter. The enthalpy of vaporization at the reference temperature 298 K of 3-iso-propyl-biphenyl was calculated from the experimental temperature dependence of vaporization enthalpy. The Ambrose-Walton equation was applied for correlation and prediction of vapour pressures and vaporization enthalpies of alkyl-substituted biphenyls.

Compounds

#	Formula	Name
1	C13H12	2-methylbiphenyl
2	C13H12	3-methylbiphenyl
3	C14H14	4,4'-dimethylbiphenyl
4	C15H16	3-(1-Methylethyl)-1,1'-biphenyl
5	C16H18	3-(1,1-dimethylethyl)-1,1'-biphenyl
6	C20H26	4,4'-bis(1,1-dimethylethyl)-1,1'-biphenyl
7	C16H18	4-(1,1-dimethylethyl)-1,1'-biphenyl
8	C13H12	4-methylbiphenyl

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Variable	Phase	Method	#Points
POMD	1	Molar enthalpy of vaporization or sublimation, kJ/mol ; Liquid	Temperature, K; Liquid	Liquid Gas	Derived by Second law	1
POMD	1	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	Transpiration method	20
POMD	2	Molar enthalpy of vaporization or sublimation, kJ/mol ; Liquid	Temperature, K; Liquid	Liquid Gas	Derived by Second law	1
POMD	2	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	Transpiration method	20
POMD	3	Molar enthalpy of vaporization or sublimation, kJ/mol ; Crystal	Temperature, K; Crystal	Crystal Gas	Derived by Second law	1
POMD	3	Vapor or sublimation pressure, kPa ; Crystal	Temperature, K; Crystal	Crystal Gas	Transpiration method	11
POMD	4	Normal boiling temperature, K ; Liquid		Liquid Gas	Ebulliometric method (Recirculating still)	1
POMD	4	Molar enthalpy of vaporization or sublimation, kJ/mol ; Liquid	Temperature, K; Liquid	Liquid Gas	Derived by Second law	1
POMD	4	Molar enthalpy of transition or fusion, kJ/mol ; Liquid	Temperature, K; Liquid	Liquid Gas	Calvet Calorimetry	6
POMD	4	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	Transpiration method	50
POMD	4	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	Ebulliometric method (Recirculating still)	14
POMD	5	Normal boiling temperature, K ; Liquid		Liquid Gas	Ebulliometric method (Recirculating still)	1
POMD	5	Molar enthalpy of vaporization or sublimation, kJ/mol ; Liquid	Temperature, K; Liquid	Liquid Gas	Derived by Second law	1
POMD	5	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	Transpiration method	16
POMD	5	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	Ebulliometric method (Recirculating still)	14
POMD	6	Molar enthalpy of vaporization or sublimation, kJ/mol ; Liquid	Temperature, K; Liquid	Liquid Gas	Derived by Second law	1
POMD	6	Vapor or sublimation pressure, kPa ; Crystal	Temperature, K; Crystal	Crystal Gas	Transpiration method	19
POMD	7	Normal boiling temperature, K ; Liquid		Liquid Gas	Ebulliometric method (Recirculating still)	1
POMD	7	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	Ebulliometric method (Recirculating still)	14
POMD	8	Normal boiling temperature, K ; Liquid		Liquid Gas	Ebulliometric method (Recirculating still)	1

Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Vapour pressures and enthalpies of vaporization of a series of the alkylbiphenyls

Nazmutdinov, A. G.[Alyanus G.], Nesterov, I. A.[Igor A.], Nazmutdinov, T. A., Nesterova, T. N.[Tatyana N.], Tarazanov, S. V.[Sergey V.], Vostrikov, S. V.[Sergey V.]

ABSTRACT