Vapor-liquid equilibria of the binary n-butane (HC-600) plus difluoromethane (HFC-32), plus pentafluoroethane (HFC-125), plus 1,1,1,2-tetrafluoroethane (HFC-134a) systems

Abstract

Binary vapor-liquid equilibrium data were measured for the n-butane (HC-600) + difluoromethane (HFC-32), + pentafluoroethane (HFC-125), 1,1,1,2-tetrafluoroethane (HFC-134a) systems at temperatures from 313.15 K to 333.15 K. These experiments were carried out with a circulating-type apparatus with on-line gas chromatography. The experimental data were correlated well with the Peng-Robinson equation of state using the Wong-Sandler mixing rules.