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Near critical measurements of HmEandVmE for { xCO2 +  (1  −  x)SF6} and measurements made over the pressure range 2.5 to 10.0 MPa at the temperature T =  301.95 K

✍ Scribed by C.J. Wormald; R.W. Hodgetts

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
347 KB
Volume
34
Category
Article
ISSN
0021-9614

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✦ Synopsis

A flow mixing calorimeter, followed by a vibrating tube densimeter, has been used to measure excess molar enthalpies H E m and excess molar volumes V E m of {xCO 2 + (1 -x)SF 6 }. Measurements over a range of mole fraction x have been made at the temperatures T = 302.15 K and T = 305.65 K at the pressures (3.76, 5.20, 6.20, and 7.38) MPa. The lowest pressure 3.76 MPa is close to the critical pressure of SF 6 and the highest pressure 7.38 MPa is close to the critical pressure of CO 2 . Measurements at x = 0.5 have been made over the pressure range (2.5 to 10.0) MPa at the temperature 301.95 K. Some of the measurements are very close to the critical locus of the mixture. The measurements are compared with the Patel-Teja equation of state which reproduces the main features of the excess function curves as well as it does for similar measurements on {xCO 2 + (1 -x)C 2 H 6 } and {xCO 2 + (1 -x)C 2 H 4 }. The equation was used to calculate residual enthalpies and residual volumes for the pure components and for the mixture, and inspection of the way these combine to give excess enthalpies and volumes assisted the interpretation of the pressure scan measurements.

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