ABSTRACT

The temperature dependence of gas chromatographic retention times for n-heptadecane to n-triacontane is reported. These data are used to evaluate the vaporization enthalpies of these compounds at T = 298.15 K, and a protocol is described that provides vapor pressures of these n-alkanes from T = 298.15 to 575 K. The vapor pressure and vaporization enthalpy results obtained are compared with existing literature data where possible and found to be internally consistent. Sublimation enthalpies for n-C17 to n-C30 are calculated by combining vaporization enthalpies with fusion enthalpies and are compared when possible to direct measurements.

Compounds

#	Formula	Name
1	C22H46	docosane
2	C23H48	tricosane
3	C24H50	tetracosane
4	C25H52	pentacosane
5	C26H54	hexacosane
6	C27H56	heptacosane
7	C28H58	octacosane
8	C29H60	nonacosane
9	C30H62	triacontane
10	C21H44	heneicosane

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	OTHER	1
POMD	1	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	OTHER	11
POMD	2	Molar enthalpy of vaporization or sublimation, kJ/mol ; Liquid	Temperature, K; Liquid	Liquid Gas	OTHER	1
POMD	2	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	OTHER	11
POMD	3	Molar enthalpy of vaporization or sublimation, kJ/mol ; Liquid	Temperature, K; Liquid	Liquid Gas	OTHER	1
POMD	3	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	OTHER	11
POMD	4	Molar enthalpy of vaporization or sublimation, kJ/mol ; Liquid	Temperature, K; Liquid	Liquid Gas	OTHER	1
POMD	4	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	OTHER	11
POMD	5	Molar enthalpy of vaporization or sublimation, kJ/mol ; Liquid	Temperature, K; Liquid	Liquid Gas	OTHER	1
POMD	5	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	OTHER	11
POMD	6	Molar enthalpy of vaporization or sublimation, kJ/mol ; Liquid	Temperature, K; Liquid	Liquid Gas	OTHER	1
POMD	6	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	OTHER	11
POMD	7	Molar enthalpy of vaporization or sublimation, kJ/mol ; Liquid	Temperature, K; Liquid	Liquid Gas	OTHER	1
POMD	7	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	OTHER	11
POMD	8	Molar enthalpy of vaporization or sublimation, kJ/mol ; Liquid	Temperature, K; Liquid	Liquid Gas	OTHER	1
POMD	8	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	OTHER	11
POMD	9	Molar enthalpy of vaporization or sublimation, kJ/mol ; Liquid	Temperature, K; Liquid	Liquid Gas	OTHER	1
POMD	9	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	OTHER	11
POMD	10	Molar enthalpy of vaporization or sublimation, kJ/mol ; Liquid	Temperature, K; Liquid	Liquid Gas	OTHER	1
POMD	10	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid	Liquid Gas	OTHER	11

Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

Vapor Pressures and Vaporization Enthalpies of the n-Alkanes from C21 to C30 at T = 298.15 K by Correlation Gas Chromatography

Chickos, J. S.[James S.], Hanshaw, W.[William]

ABSTRACT