The vaporization enthalpy of valproic acid (2-propylpentanoic acid) is reported, and the vapor pressures of a series on aliphatic carboxylic acids are used to evaluate its vapor pressure as a function of temperature. The vaporization enthalpy was derived by correlation-gas chromatography. This resulted in a vaporization enthalpy, ?Hvap(298.15 K) of (74.8 +- 2.4) kJ*mol 1. Vapor pressures from T/K = 298.15 to boiling temperature of valproic acid are also reported. A normal boiling temperature of T/K = 492.8 (lit., 494 5 K) and a vapor pressure of (2.2 +- 0.3) Pa has been evaluated for valproic acid at T/K = 298.15. This compares favorably with an Environmental Protection Agency estimate of 6.1 Pa.
Compounds
#
Formula
Name
1
C8H16O2
2-propylpentanoic acid
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 enthalpy of transition or fusion, kJ/mol ; Liquid