Thermodynamic Properties of Hydrogen + Tetra-𝑛-Butyl Ammonium Bromide Semi-Clathrate Hydrate

Table 1

Three-phase equilibrium conditions of ${\text{H}}_2$ + TBAB semi-clathrate hydrate at the TBAB mole fraction of 0.020 and 0.037 in high-pressure region. The conditions in low-pressure region are shown in our previous papers [6, 8]. x represents the mole fraction of TBAB aqueous solution.

	T (K)	p (MPa)		T (K)	p (MPa)
$x=0.020$	286.45	19.5	$x=0.037$	288.35	23.1
	288.23	35.6	tetragonal	291.56	58.7
	290.07	58.0		293.95	99.2
↑	290.97	78.8		295.86	143.9
tetragonal	291.53	91.6		297.85	185.0
new structure	292.87	101.3
↓	294.75	140.6