Measurements of Hm E and Vm E for {xC4H10 + (1 - x)SF6} in the supercritical region at the pressure 8.00 MPa

  • Wormald C
  • Du'Gay A
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Abstract

Measurements of the excess molar enthalpy HmEand the excess molar volume VmEof {xC4H10)+(1-x)SF6} made in the supercritical region at the pressure p=8.00MPa and seven temperatures over the range 311.25-425.75K are reported. The measurements extend the range of similar measurements made at the pressure 6.00MPa reported recently. The measurements were made using a flow mixing calorimeter followed by a vibrating tube densimeter. The results are compared with the Patel-Teja (PT) equation-of-state with parameters determined by solving a cubic equation as they recommend, and also with parameters determined by the method suggested by Valderrama-Cisternas (VC) who proposed equations in which the parameters are a function of the critical compressibility factor Zc. The overall fit to the HmEand VmEmeasurements obtained using the Valderrama and Cisternas equation is found to be better than that obtained using the parameters obtained by the method suggested by Patel and Teja. © 2002 Elsevier Science B.V. All rights reserved.

Author-supplied keywords

  • Butane
  • Critical region
  • Excess enthalpy
  • Excess volume
  • Flow mixing calorimeter
  • Sulfur hexafluoride

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Authors

  • C. J. Wormald

  • A. P. Du'Gay

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