Calorimetric Measurements on Ionic Semiclathrate Hydrate Formed with Tetrabutylammonium Sulfate (TBASO4)

This paper reports the dissociation heats of ionic semiclathrate hydrate formed with tetrabutylammonium sulfate (TBASO4) holding the bivalent anion. The heat flow rates and the dissociation heats of TBASO4 hydrate were measured by the differential scanning calorimetry (DSC) at the mass fractions 0.30, 0.34 and 0.38. On the DSC curves of the heat flow rate, the two peaks were observed at the mass fractions 0.30 and 0.34, and the single peak was observed at the mass fraction 0.38. The largest dissociation heat of TBASO4 hydrate was 190 kJ·kg-1 at the mass fraction 0.34.