ABSTRACT

Liquid liquid equilibrium (LLE) temperatures versus composition for N,N-dimethylacetamide (DMA) + decane, + dodecane, + tetradecane, + 2,2,4-trimethylpentane, + methylcyclohexane, or + cyclooctane mixtures have been measured by means of the critical opalescence method using a laser scattering technique. All the systems show an upper critical solution temperature (UCST). In the case of n-alkane mixtures, UCST increases almost linearly with the chain length of the n-alkane. Moreover, these solutions show higher UCST values than those with isomeric cyclic alkanes. Branching leads to a strong decrease of UCST. The symmetry of the LLE curves depends on the size and shape of the alkane. DISQUAC correctly represents the coordinates of the critical points using interaction parameters available in the literature.

Compounds

#	Formula	Name
1	C4H9NO	N,N-dimethylethanamide
2	C10H22	decane
3	C12H26	dodecane
4	C14H30	tetradecane
5	C7H14	methylcyclohexane
6	C8H16	cyclooctane
7	C8H18	2,2,4-trimethylpentane

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	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Vibrating tube method	1
POMD	2	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Vibrating tube method	1
POMD	3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Vibrating tube method	1
POMD	4	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Vibrating tube method	1
POMD	5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Vibrating tube method	1
POMD	6	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Vibrating tube method	1
POMD	7	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Vibrating tube method	1
POMD	2 1	Liquid-liquid equilibrium temperature, K ; Liquid mixture 1	Mole fraction - 1; Liquid mixture 1	Pressure, kPa; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2	VISOBS	30
POMD	3 1	Liquid-liquid equilibrium temperature, K ; Liquid mixture 1	Mole fraction - 1; Liquid mixture 1	Pressure, kPa; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2	VISOBS	25
POMD	1 4	Liquid-liquid equilibrium temperature, K ; Liquid mixture 1	Mole fraction - 1; Liquid mixture 1	Pressure, kPa; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2	VISOBS	15
POMD	5 1	Liquid-liquid equilibrium temperature, K ; Liquid mixture 1	Mole fraction - 1; Liquid mixture 1	Pressure, kPa; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2	VISOBS	34
POMD	1 6	Liquid-liquid equilibrium temperature, K ; Liquid mixture 1	Mole fraction - 1; Liquid mixture 1	Pressure, kPa; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2	VISOBS	33
POMD	1 7	Liquid-liquid equilibrium temperature, K ; Liquid mixture 1	Mole fraction - 1; Liquid mixture 1	Pressure, kPa; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2	VISOBS	32

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

Thermodynamics of Mixtures Containing a Very Strongly Polar Compound. 10. Liquid Liquid Equilibria for N,N-Dimethylacetamide + Selected Alkanes

Tristan, C. A.[Cristina Alonso], Gonzalez, J. A.[Juan Antonio], Garcia de la Fuente, I.[Isaias], Cobos, J. C.[Jose Carlos]

ABSTRACT