Vapor-liquid equilibrium data for the ammonia-water system and its description with a modified cubic equation of state

New pressure-temperature-overall composition vapor-liquid equilibrium (VLE) data ar reported fot the ammonia-water system at five temperatures between 20 and 140°C and up to 500 psia. These data have been converted to T-P-x data, and vapor-phase compositions have been calculated by means of a Redlich-Kwong equation of state modified to include Peneloux's volume translation and a density-dependent mixing rule. In order to achieve agreement of calculated vapor-phase compositions with previous literature results, it was necessary to use different k ij values in the vapor and liquid phases