ABSTRACT

The saturation heat capacities of eleven polyoxyethylene glycol monoalkyl ethers (CnEm) were measured by the calorimetric (DSC) method. The measurements were performed within the temperature range of (275.15 to 339.15) K by means of Micro DSCIII (Setaram) calorimeter. Assuming that the molar heat capacity (Cp,m) shows an additive character, the contributions to the Cp,m values of particular functional groups forming the compounds of CnEm series were calculated. Two models differing in the manner of molecule division into functional groups, i.e., first- and second-order additivity group contribution approach, were used. In the latter, not only the type of functional group but also its position and the closest neighborhood was taken into account. The average deviations between the experimental values of Cp and those estimated on the basis of the group contributions do not exceed 0.4 % for the compound of the series under investigation. The group contributions determined in this study make it possible to predict the molar heat capacity of monoethers CnEm within the temperature range of (270 to 350) K with an average error below 1 %.

Compounds

#	Formula	Name
1	C4H10O2	2-ethoxyethan-1-ol
2	C5H12O2	2-propoxyethanol
3	C6H14O2	2-butoxyethan-1-ol
4	C5H12O3	2-(2-methoxyethoxy)ethanol
5	C6H14O3	3,6-dioxa-1-octanol
6	C7H16O3	2-(2-propoxyethoxy)ethanol
7	C8H18O3	3,6-dioxa-1-decanol
8	C10H22O3	2-(2-hexyloxyethoxy)ethanol
9	C7H16O4	2-[2-(2-methoxyethoxy)ethoxy]ethanol
10	C14H30O4	2-[2-[2-(octyloxy)ethoxy]ethoxy]ethanol
11	C9H20O5	3,6,9,12-tetraoxatridecanol

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	Large sample (1 g) DSC	34
POMD	2	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Large sample (1 g) DSC	34
POMD	3	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Large sample (1 g) DSC	34
POMD	4	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Large sample (1 g) DSC	34
POMD	5	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Large sample (1 g) DSC	34
POMD	6	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Large sample (1 g) DSC	34
POMD	7	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Large sample (1 g) DSC	34
POMD	8	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Large sample (1 g) DSC	34
POMD	9	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Large sample (1 g) DSC	34
POMD	10	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Large sample (1 g) DSC	34
POMD	11	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Large sample (1 g) DSC	34

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

Measurement and Prediction of Molar Heat Capacities of Liquid Polyoxyethylene Glycol Monoalkyl Ethers (CnEm)

Goralski, P.[Pawel], Tkaczyk, M.[Mariola]

ABSTRACT