The vapor‐liquid equilibrium of the hydrogen—n‐butane system at elevated pressures

Abstract

Abstract The vapor‐liquid equilibrium of the hydrogen– n –butane system was studied at temperatures between 54° and 121°C and at pressures up to 167 atm. The fugacity of hydrogen in the vapor phase was measured directly by using a palladium‐silver semipermeable membrane, whereas p‐T‐x‐y data were obtained in a conventional manner. Henry's constants for hydrogen in n ‐butane were obtained from the experimental fugacity data without making any assumptions about the vapor phase. Constant‐pressure, liquid‐phase activity coefficients for both hydrogen and n ‐butane were calculated and correlated by using a modified van Laar equation.