Gas hydrates of nitrogen and oxygen. II

Abstract

p-t relations of different three phase equilibria in the systems nitrogen-water and oxygen-water are given from -6 to 18" for pressures up to 10o0 atm. From the data, the heats of formation of nitrogen-and oxygen-hydrate and the composition of these hydrates were calculated.

Considering multiple occupancy of cavities in clathrate hydrate phase equilibrium calculations

“…A similar comparison for oxygen hydrate from 273 K to 295 K is illustrated in figure 2, where the experimental data are taken from Mohammadi et al [21] and van Cleeff and Diepen [22]. The agreement between the calculated results and the experimental data is quite well for nitrogen hydrates and the results are acceptable for oxygen hydrates, especially at lower pressures.…”

“…Estimated dissociation pressures of oxygen hydrate (solid line) in comparison with some reported experimental data (circles)[21,22].…”

A Simple Method for Calculation of the Composition of Type I Clathrate Hydrates

“…Since the kinetic factors have great importance,3–6 any of two samples prepared by the same way but from different charges do not provide the same composition before attaining the complete equilibrium state. In case of nitrogen hydrate, the composition, the density, and the lattice constant were determined from one sample, thus we could compare the results 23. The experimentally found result for the nitrogen Type 1 hydrate from tension measurements is n 4 = 6.01 ± 0.23.…”

Simulation Study on the Influence of Gas Mole Fraction and Aqueous Activity under Phase Equilibrium

“…Experimental and predicted phase equilibrium conditions for N2/O2 + water systems. van Cleeff and Diepen [43], squares □, ■; Mohammadi et al [44], triangles ▲,▽; Duc et al [45], stars ★; van Cleeff and Diepen [46], circles ○. Exp.pure N 2 [43] Exp.pure N 2 [44] Exp.pure N 2 [45] Calc.N 2…”