The isothermal vapor-liquid equilibrium(VLE)for tetrafluoromethane(CF4)+ propane(C3H8)system was measured and P

T

y data were collected at temperatures of 142.96

163.07

183.10

203.26

223.17

243.12

263.15

283.01 and 293.23 K.A vapor recirculation method was used to achieve quick equilibrium.The temperatures were measured with Pt100 platinum resistance thermometers and the uncertainty was less than ±0.005 K.The pressure was surveyed by two absolute pressure transducers

one by Keller PA33 pressure transducer with a full scale of 2 MPa and uncertainty of ±200 Pa

and the other by Mensor 6100 with a full scale of 10 MPa and uncertainty of ±1 kPa.The mixture composition measurement was performed by using a gas chromatograph(Agilent HP 6890N).After careful calibration

uncertainty was within ±0.002 in mole fraction over the whole range of concentrations.The experimental results were correlated with the Peng-Robinson equation of state and the van der Waals two-parameters mixing rule.The mean deviations between the correlated and measured vapor compositions were found satisfactory as 0.011 and the data showed good accuracy and consistency.