ABSTRACT

In this work, the solubility data of CO2 in three kinds of guaiacol-based deep eutectic solvents (DESs) at 293.15, 303.15, 313.15, and 323.15 K and pressures below 600.0 kPa were determined. The DESs were prepared from guaiacol and quaternary ammonium salts (QASs, including choline chloride, acetylcholine chloride, and diethylamine hydrochloride) with a molar ratio of guaiacol to QAS of 3:1, 4:1, and 5:1. Henry s law was used to correlate the solubility data, and the thermodynamic properties, such as standard Gibbs free energy, standard enthalpy, and standard entropy of these systems were derived. The solubility of CO2 increased with increasing molar ratio of guaiacol to QAS in each kind of DES. The dissolution enthalpies were negative at all conditions. The dissolution capacities of present DESs for CO2 were further compared with those of other DESs and several common ionic liquids.

Compounds

#	Formula	Name
1	C5H14ClNO	choline chloride
2	C4H12ClN	diethylammonium chloride
3	C7H16ClNO2	acetylcholine chloride
4	C7H8O2	2-methoxyphenol
5	CO2	carbon dioxide

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 4	Mass density, kg/m3 ; Liquid	Mole fraction - 4; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Pycnometric method	12
POMD	4 2	Mass density, kg/m3 ; Liquid	Mole fraction - 4; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Pycnometric method	12
POMD	3 4	Mass density, kg/m3 ; Liquid	Mole fraction - 4; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Pycnometric method	12
POMD	1 4 5	Vapor or sublimation pressure, kPa ; Liquid	Molality, mol/kg - 5; Liquid Temperature, K; Liquid Solvent: Amount ratio of component to other component of binary solvent - 4; Liquid		Liquid Gas	CCell	72
POMD	4 5 2	Vapor or sublimation pressure, kPa ; Liquid	Molality, mol/kg - 5; Liquid Temperature, K; Liquid Solvent: Amount ratio of component to other component of binary solvent - 4; Liquid		Liquid Gas	CCell	72
POMD	3 4 5	Vapor or sublimation pressure, kPa ; Liquid	Molality, mol/kg - 5; Liquid Temperature, K; Liquid Solvent: Amount ratio of component to other component of binary solvent - 4; Liquid		Liquid Gas	CCell	72

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

Solubilities and Thermodynamic Properties of Carbon Dioxide in Guaiacol-Based Deep Eutectic Solvents

Liu, X.[Xiaobang], Gao, B.[Bao], Jiang, Y.[Yaotai], Ai, N.[Ning], Deng, D.[Dongshun]

ABSTRACT