ABSTRACT

Values of solid-liquid equilibrium (SLE) for the organic binary mixtures of {n-octadecane (1) + myristic acid (2)} (eutectic temperature TE = 299.65 K, eutectic composition x1E = 0.897, latent heat of melting of eutectic mixture DfusHE = 236 J g 1), {n-octadecane (1) + palmitic acid (2)} (TE = 300.35 K, x1E = 0.950, DfusHE = 238 J g 1) were measured in this study using differential scanning calorimetry (DSC). Simple eutectic behaviour is observed for these systems. The experimental and predicted solid liquid phase diagrams investigated in this work are characterised by positive deviations from ideality (c greater than 1). The experimental data are correlated as functions of the temperature using non-ideal solution models, namely, the Buchowski (kh) equation, UNIQUAC, and UNIFAC models, respectively, and satisfactory results are presented.

Compounds

#	Formula	Name
1	C18H38	octadecane
2	C14H28O2	tetradecanoic acid
3	C16H32O2	hexadecanoic acid

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	Constraint	Phase	Method	#Points
POMD	1	Molar enthalpy of transition or fusion, kJ/mol ; Crystal			Crystal Liquid Air at 1 atmosphere	DSC	1
POMD	1	Normal melting temperature, K ; Crystal			Crystal Liquid Air at 1 atmosphere	DTA	1
POMD	2	Molar enthalpy of transition or fusion, kJ/mol ; Crystal			Crystal Liquid Air at 1 atmosphere	DSC	1
POMD	2	Normal melting temperature, K ; Crystal			Crystal Liquid Air at 1 atmosphere	DTA	1
POMD	3	Molar enthalpy of transition or fusion, kJ/mol ; Crystal			Crystal Liquid Air at 1 atmosphere	DSC	1
POMD	3	Normal melting temperature, K ; Crystal			Crystal Liquid Air at 1 atmosphere	DTA	1
POMD	2 1	Eutectic temperature, K ; Liquid			Liquid Crystal - 2 Crystal - 1 Air at 1 atmosphere	DTA	1
POMD	2 1	Solid-liquid equilibrium temperature, K ; Liquid	Mole fraction - 1; Liquid	Pressure, kPa; Liquid	Liquid Crystal - 2	DTA	13
POMD	2 1	Solid-liquid equilibrium temperature, K ; Liquid	Mole fraction - 1; Liquid	Pressure, kPa; Liquid	Liquid Crystal - 1	DTA	2
POMD	3 1	Eutectic temperature, K ; Liquid			Liquid Crystal - 3 Crystal - 1 Air at 1 atmosphere	DTA	1
POMD	3 1	Solid-liquid equilibrium temperature, K ; Liquid	Mole fraction - 1; Liquid	Pressure, kPa; Liquid	Liquid Crystal - 3	DTA	13
POMD	3 1	Solid-liquid equilibrium temperature, K ; Liquid	Mole fraction - 1; Liquid	Pressure, kPa; Liquid	Liquid Crystal - 1	DTA	2

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Solid-liquid phase equilibria of (n-octadecane with myristic, and palmitic acid) binary mixtures used as phase change materials (PCMs)

Wei, D.[Dongwei], Han, S.[Sainan], Shen, X.[Xiao]

ABSTRACT