The fugacity of hydrogen in mixtures with ammonia and propane was determined directly from a physical equilibrium method using a palladium-silver semipermeable membrane, at temperatures between 71 and 121°C (160 and 250°F) and pressures up to 102 atm (1500 psi). Measurements at low hydrogen concentrations were emphasized in order to investigate the region of higher nonideality of the gas mixtures. The data obtained were used to evaluate the predictive properties of a number of equations of state. These included both the original and a modified Redlich-Kwong, Black, Martin-Hou, Benedict-Webb-Rubin, and the virial equations.
The fugacity of ammonia in mixtures with hydrogen and propane was measured by a chemical equilibrium method at temperatures between 54 and 81 °C (130 and 178 °F) and pressures up to 96 atm (1410 psi). The chemical equilibrium involved the reaction between ammonia, barium chloride, and barium chloride octaammine. Thermodynamic consistency of the results for the hydrogen-ammonia system was verified by an integration of the Gibbs-Duhem equation using independent hydrogen fugacity data. Experimental results were also compared with values predicted by the Redlich-Kwong, a modified Redlich-Kwong, Black, Martin-Hou, Benedict-Webb-Rubin, and virial equations.
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