ABSTRACT

The deep eutectic solvent ethaline, containing choline chloride as H-bond acceptor and ethylene glycol as H-bond donor and one of its mixture with water are studied in this work. Ethaline is anhydrous, with a 1:2 mol ratio. Hydrated ethaline, choline chloride:ethylene glycol:water, was studied in a 1:1.98:0.95 mol ratio. Several volumetric, acoustic, optical, thermal, surface, and transport properties were measured and calculated. The working temperature ranges from 278.15 to 338.15 K at pressure = 0.1 MPa. The effects of temperature, water inclusion, and the nature of the donor compound are evaluated. With regard to temperature, the system's behaviour is as expected: a linear relation for the thermodynamic properties and agreement with the Vogel-Fulcher-Tammann equation for the transport properties. The water molecules hardly modify the ethaline structure. The choline chloride - ethylene glycol interactions are weaker than those for choline chloride - glycerol.

Compounds

#	Formula	Name
1	C5H14ClNO	choline chloride
2	C2H6O2	1,2-ethanediol
3	H2O	water

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 2 3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Mole fraction - 3; Liquid Mole fraction - 1; Liquid Pressure, kPa; Liquid	Liquid	Vibrating tube method	25
POMD	1 2 3	Speed of sound, m/s ; Liquid	Temperature, K; Liquid	Mole fraction - 3; Liquid Mole fraction - 1; Liquid Pressure, kPa; Liquid Frequency, MHz; Liquid	Liquid	Single path-length method	25
POMD	1 2 3	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid	Mole fraction - 3; Liquid Mole fraction - 1; Liquid Pressure, kPa; Liquid	Liquid	Standard Abbe refractometry	23
POMD	1 2 3	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Mole fraction - 3; Liquid Mole fraction - 1; Liquid Pressure, kPa; Liquid	Liquid	DSC	25
POMD	1 2 3	Surface tension liquid-gas, N/m ; Liquid	Temperature, K; Liquid	Mole fraction - 3; Liquid Mole fraction - 1; Liquid	Liquid Air at 1 atmosphere	Drop volume	25
POMD	1 2 3	Kinematic viscosity, m2/s ; Liquid	Mole fraction - 3; Liquid Mole fraction - 1; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Capillary tube (Ostwald; Ubbelohde) method	26
POMD	1 2 3	Electrical conductivity, S/m ; Liquid	Temperature, K; Liquid	Mole fraction - 3; Liquid Mole fraction - 1; Liquid Pressure, kPa; Liquid Frequency, MHz; Liquid	Liquid	Alternating current cell with electrodes	25
POMD	1 2	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Mole fraction - 1; Liquid Pressure, kPa; Liquid	Liquid	Vibrating tube method	25
POMD	1 2	Speed of sound, m/s ; Liquid	Temperature, K; Liquid	Mole fraction - 1; Liquid Pressure, kPa; Liquid Frequency, MHz; Liquid	Liquid	Single path-length method	25
POMD	1 2	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid	Mole fraction - 1; Liquid Pressure, kPa; Liquid	Liquid	Standard Abbe refractometry	23
POMD	1 2	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Mole fraction - 1; Liquid Pressure, kPa; Liquid	Liquid	DSC	25
POMD	1 2	Surface tension liquid-gas, N/m ; Liquid	Temperature, K; Liquid	Mole fraction - 1; Liquid	Liquid Air at 1 atmosphere	Drop volume	25
POMD	1 2	Kinematic viscosity, m2/s ; Liquid	Temperature, K; Liquid	Mole fraction - 1; Liquid Pressure, kPa; Liquid	Liquid	Capillary tube (Ostwald; Ubbelohde) method	25
POMD	1 2	Electrical conductivity, S/m ; Liquid	Temperature, K; Liquid	Mole fraction - 1; Liquid Pressure, kPa; Liquid Frequency, MHz; Liquid	Liquid	Alternating current cell with electrodes	25

Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Thermophysical characterization of the deep eutectic solvent choline chloride:ethylene glycol and one of its mixtures with water

Lapena, David, Lomba, Laura, Artal, Manuela, Lafuente, Carlos, Giner, Beatriz

ABSTRACT