Isothermal vapor-liquid equilibrium (VLE) data for the binary mixture of 2,3,3,3-tetrafluoroprop-1-ene (HFO-1234yf) + 1,1-difluoroethane (HFC-152a)were measured at temperatures from 283.15 K to 323.15K using a recirculation apparatus. The experimental data were correlated by using PR EoS with vdW mixing rule, the comparison between the correlation results and experimental data showed a good agreement. HFO-1234yf (1) + HFC-152a (2) system shows not only azeotropic behavior but also near azeotropic behavior with a very small temperature glide of less than 0.4K within the complete range of composition and of temperature. (C) 2014 Elsevier B.V. All rights reserved.