ABSTRACT

Heat capacities of glycol/H2O/salt systems have been measured over the temperature range 303.15 353.15K with a differential scanning calorimeter. The salts studied were lithium chloride and lithium bromide; the glycols considered were diethylene glycol, triethylene glycol, tetraethylene glycol, propylene glycol and dipropylene glycol. For each ternary system, four systems of which (4 25 mass%) salt mixed with various glycols (50 80 mass%)were studied. An extended Redlich-Kister-type binary system equation was used to correlate the measured heat capacity data. To this end, the heat capacities of pure glycols and aqueous glycol solutions were also measured. The correlations give satisfactory results as shown by an overall AAD for heat capacity calculations of 0.5% for 234 data points. The present measurements are, in general, of sufficient accuracy for most engineering-design calculations for the design of dehumidifier equipments.

Compounds

#	Formula	Name
1	C4H10O3	diethylene glycol
2	C6H14O4	triethylene glycol
3	C8H18O5	tetraethylene glycol
4	C3H8O2	1,2-propanediol
5	C6H14O3	4-oxa-1,7-heptanediol
6	ClLi	lithium chloride
7	BrLi	lithium bromide
8	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	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vacuum adiabatic calorimetry	6
POMD	2	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vacuum adiabatic calorimetry	6
POMD	3	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vacuum adiabatic calorimetry	6
POMD	4	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vacuum adiabatic calorimetry	6
POMD	5	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vacuum adiabatic calorimetry	6
POMD	1 8	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Mole fraction - 1; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vacuum adiabatic calorimetry	30
POMD	2 8	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Mole fraction - 2; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vacuum adiabatic calorimetry	30
POMD	3 8	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Mole fraction - 3; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vacuum adiabatic calorimetry	30
POMD	4 8	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Mole fraction - 4; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vacuum adiabatic calorimetry	30
POMD	8 5	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Mole fraction - 5; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vacuum adiabatic calorimetry	30
POMD	1 6 8	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Mass fraction - 1; Liquid Mass fraction - 8; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vacuum adiabatic calorimetry	24
POMD	2 6 8	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Mass fraction - 2; Liquid Mass fraction - 8; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vacuum adiabatic calorimetry	24
POMD	3 6 8	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Mass fraction - 3; Liquid Mass fraction - 8; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vacuum adiabatic calorimetry	18
POMD	4 6 8	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Mass fraction - 4; Liquid Mass fraction - 8; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vacuum adiabatic calorimetry	24
POMD	6 8 5	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Mass fraction - 5; Liquid Mass fraction - 8; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vacuum adiabatic calorimetry	24
POMD	1 7 8	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Mass fraction - 1; Liquid Mass fraction - 8; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vacuum adiabatic calorimetry	24
POMD	2 7 8	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Mass fraction - 2; Liquid Mass fraction - 8; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vacuum adiabatic calorimetry	24
POMD	3 7 8	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Mass fraction - 3; Liquid Mass fraction - 8; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vacuum adiabatic calorimetry	24
POMD	4 7 8	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Mass fraction - 4; Liquid Mass fraction - 8; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vacuum adiabatic calorimetry	24
POMD	7 8 5	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Mass fraction - 5; Liquid Mass fraction - 8; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vacuum adiabatic calorimetry	24

Thermodynamics Research Center / ThermoML | Thermochimica Acta

Heat capacities of the mixed-solvents desiccants (glycols +water + salts)

Li, C.-K.[Chi-Kwang], Soriano, A. N.[Allan N.], Li, M. -H.[Meng-Hui]

ABSTRACT