ABSTRACT

In this work, the molar heat capacity of type III Deep Eutectic Solvents (DESs) for three quaternary salts was investigated in the temperature range of 298.15-353.15 K. Several hydrogen bond donors were used with the three salts to prepare the DESs. Melting and/or glass transition points of the DESs were also measured and presented. The results showed that the molar heat capacity for all systems increased almost linearly with temperature. In addition, the results showed that molar heat capacity is directly proportional to the molar mass of the DES. The molar heat capacity for all DES systems studied in this work ranged from (219.3-605.9) J. mol-1.K-1. Tetrabutylammonium Chloride (TBAC) - Urea DES system showed the highest molar heat capacity range (590.1-605.9) J. mol-1.K-1 while the Choline Chloride (ChCl)-Phenol system had the lowest range (219.3-236.8) J. mol-1.K-1. TBAC-Urea DES system had the highest melting point (300.29 K) compared to all other DES systems in this work. Melting and/or glass transition points for the all studied systems ranged from 224.8-300.29 K. This indicated that these solvents could be used in the liquid phase at room temperature for future applications.

Compounds

#	Formula	Name
1	C5H14ClNO	choline chloride
2	C16H36ClN	tetrabutylammonium chloride
3	C19H18BrP	methyltriphenylphosphonium bromide
4	C6H14O4	triethylene glycol
5	C6H12O6	D-fructose
6	C6H12O6	D-glucose
7	C3H4O4	propanedioic acid
8	C6H8O7	citric acid
9	C2H2O4	ethanedioic acid
10	C6H6O	phenol
11	C3H8O3	glycerol
12	CH4N2O	urea
13	C2H6O2	1,2-ethanediol

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	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Mole fraction - 1; Liquid	Liquid	Small sample (50 mg) DSC	23
POMD	5 1	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Mole fraction - 1; Liquid	Liquid	Small sample (50 mg) DSC	23
POMD	6 1	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Mole fraction - 1; Liquid	Liquid	Small sample (50 mg) DSC	23
POMD	1 7	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Mole fraction - 1; Liquid	Liquid	Small sample (50 mg) DSC	23
POMD	1 8	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Mole fraction - 1; Liquid	Liquid	Small sample (50 mg) DSC	23
POMD	1 9	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Mole fraction - 1; Liquid	Liquid	Small sample (50 mg) DSC	23
POMD	1 10	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Mole fraction - 1; Liquid	Liquid	Small sample (50 mg) DSC	23
POMD	11 2	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Mole fraction - 2; Liquid	Liquid	Small sample (50 mg) DSC	23
POMD	12 2	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Mole fraction - 2; Liquid	Liquid	Small sample (50 mg) DSC	19
POMD	13 2	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Mole fraction - 2; Liquid	Liquid	Small sample (50 mg) DSC	23
POMD	7 2	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Mole fraction - 2; Liquid	Liquid	Small sample (50 mg) DSC	23
POMD	4 2	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Mole fraction - 2; Liquid	Liquid	Small sample (50 mg) DSC	23
POMD	7 3	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Mole fraction - 3; Liquid	Liquid	Small sample (50 mg) DSC	23
POMD	11 3	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Mole fraction - 3; Liquid	Liquid	Small sample (50 mg) DSC	23
POMD	13 3	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Mole fraction - 3; Liquid	Liquid	Small sample (50 mg) DSC	23

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

Molar Heat Capacity of Selected Type III Deep Eutectic Solvents

Naser, J.[Jamil], Mjalli, F. S.[Farouq Sabri], Sani Gano, Z.[Zaharaddeenn]

ABSTRACT