ABSTRACT

A new low transition temperature mixture (LTTM) formed by lactic acid and choline chloride is evaluated in this work as solvent for separation of CO2. The new liquid solvent is prepared by mixing two natural and readily available solid starting materials showing strong hydrogen bond interactions. The physical and phase behaviour of these mixtures can be tailored as a function of the nature and ratio of the constituents, temperature and water content. A complete characterization of physical properties (density, viscosity, surface tension, glass transition temperature) is carried out. The phase behaviour and Henry s constant for the pseudo-binary system composed of LTTM (lactic acid:choline chloride = 2:1) and CO2 are also studied. This work opens room for further optimization of a possible CO2 capturing process using LTTMs.

Compounds

#	Formula	Name
1	H2O	water
2	CO2	carbon dioxide
3	C3H6O3	2-hydroxypropanoic acid
4	C5H14ClNO	choline chloride

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	3 4	Mass density, kg/m3 ; Liquid	Amount ratio of solute to solvent - 3; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	140
POMD	3 4	Viscosity, Pa*s ; Liquid	Amount ratio of solute to solvent - 3; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Capillary tube (Ostwald; Ubbelohde) method	140
POMD	3 4	Surface tension liquid-gas, N/m ; Liquid	Temperature, K; Liquid	Amount ratio of solute to solvent - 3; Liquid	Liquid Air at 1 atmosphere	Capillary rise	9
POMD	3 4 1	Mass density, kg/m3 ; Liquid	Mass fraction - 1; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid Amount ratio of solute to solvent - 3; Liquid	Liquid	Vibrating tube method	118
POMD	3 4 1	Viscosity, Pa*s ; Liquid	Mass fraction - 1; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid Amount ratio of solute to solvent - 3; Liquid	Liquid	Capillary tube (Ostwald; Ubbelohde) method	118
POMD	3 4 2	Vapor or sublimation pressure, kPa ; Liquid	Mole fraction - 2; Liquid Temperature, K; Liquid	Amount ratio of solute to solvent - 3; Liquid	Liquid Gas	Closed cell (Static) method	40

Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

A new low transition temperature mixture (LTTM) formed by choline chloride + lactic acid: Characterization as solvent for CO2 capture

Francisco, M.[Maria], Bruinhorst, A. v. d.[Adriaan van den], Zubeir, L. F.[Lawien F.], Peters, C. J.[Cor J.], Kroon, M. C. C.[Maaike C.]

ABSTRACT