The saturated heat capacities of oxygenated gasoline additives methyl tert-butyl ether (MTBE), ethyl tert-butyl ether (ETBE), diisopropyl ether (DIPE), and tert-amyl methyl ether (TAME) in the temperature range of 277.15 K to some degrees below their normal boiling temperatures have been measured. A Micro DSC II from Setaram (France) with batch cells designed in our laboratory and the "scanning method" were used to perform the measurements. The estimated uncertainty of the saturated heat capacities was better than 0.3%. In the literature, there exist csat(T) data for some of the liquids studied. Agreement with our measurements is within the range of the experimental uncertainties. At each temperature, the saturated heat capacity of liquid MTBE is smaller than those of ETBE, DIPE, and TAME, and the corresponding csat values of these three liquids are similar. This behavior can be related with the surface fraction of the ether group in each molecule.
Compounds
#
Formula
Name
1
C5H12O
2-methoxy-2-methylpropane
2
C6H14O
2-ethoxy-2-methylpropane
3
C6H14O
diisopropyl ether
4
C6H14O
2-methoxy-2-methylbutane
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 saturation pressure, J/K/mol ; Liquid
Temperature, K; Liquid
Liquid
Gas
Large sample (1 g) DSC
25
POMD
2
Molar heat capacity at saturation pressure, J/K/mol ; Liquid
Temperature, K; Liquid
Liquid
Gas
Large sample (1 g) DSC
32
POMD
3
Molar heat capacity at saturation pressure, J/K/mol ; Liquid
Temperature, K; Liquid
Liquid
Gas
Large sample (1 g) DSC
31
POMD
4
Molar heat capacity at saturation pressure, J/K/mol ; Liquid