Solubilities of dicyandiamide in five different solvents including water, methanol, ethanol, glycol andacetone were determined at temperature ranging from 273.15 to 338.95 K at atmospheric pressure using a gravimetric method. Fusion enthalpy, melting temperature, Tm, and the difference in molar heat capacity of the liquid and solid form of dicyandiamide, were determined by differential scanning calorimetry. On this basis, the ideal solubility of dicyandiamide was calculated, and validity of heat capacity assumptions (specifically, delta-Cp= 0) in predicting the ideal solubility has been evaluated. Further, the measured solubility data was used with the calculated ideal solubility to obtain activity coefficients,which were then fitted to a van't Hoff like regular solution equation.
Compounds
#
Formula
Name
1
C2H4N4
N-cyanoguanidine
2
CH4O
methanol
3
C2H6O
ethanol
4
C2H6O2
1,2-ethanediol
5
C3H6O
acetone
6
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
Normal melting temperature, K ; Crystal
Crystal
Liquid
Air at 1 atmosphere
DTA
1
POMD
1
Molar enthalpy of transition or fusion, kJ/mol ; Crystal