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A flow calorimeter for the measurement of the isothermal Joule-Thomson coefficient of gases at elevated temperatures and pressures. Results for nitrogen at temperatures up to 473 K and pressures up to 10 MPa and for carbon dioxide at temperatures up to 500 K and pressures up to 5 MPa

✍ Scribed by L. Cuscó; S.E. McBain; G. Saville

Publisher: Elsevier Science
Year: 1995
Tongue: English
Weight: 544 KB
Volume: 27
Category: Article
ISSN: 0021-9614
DOI: 10.1006/jcht.1995.0073

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✦ Synopsis

A new isothermal flow calorimeter for gases at high temperatures and pressures is described. The calorimeter employs a throttling-capillary tube to provide both the pressure drop and the heating element. Considerable care was taken to operate the calorimeter in an isothermal environment by use of a fluidized-bed thermostat. The instrument has been used to make measurements of the molar isothermal Joule-Thomson coefficient of N2 at temperatures in the range 295 K to 473 K and at pressures in the range of 1.0 MPa to 10.0 MPa and also of CO2 at temperatures in the range 300 K to 500 K and at pressures in the range 3.0 MPa to 5.0 MPa. The molar isothermal Joule-Thomson coefficient for N2 has been measured to 21 J•MPa -1 •mol -1 and that for CO2 to 24 J•MPa -1 •mol -1 . Agreement is found with other available experimental results and with the predictions made by the IUPAC-approved equations of state.

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