PVT Properties of Dinitrogen Monoxide

Abstract

The PVT properties of dinitrogen monoxide (N2O) have been measured. In particular, experiments were performed by means of two different apparatus, both in the two-phase region and in the superheated vapor-phase region: the isochoric method was applied in the saturation region, and the Burnett method was applied in the vapor region. Isochoric measurements were carried out at temperatures from (219 to 273) K and at pressures from (550 to 3100) kPa. The 18 measurements along the saturated liquid−vapor region were fit, together with selected literature data, with the Wagner equation. For Burnett measurements, 14 runs along 7 isotherms in a pressure range from (170 to 5200) kPa were made. The second and third virial coefficients were derived, and good consistency was found after comparison with data in the literature.

Burnett Measurements and Virial Coefficients for the R32 + N2O System

“…The second and third virial coefficients for nitrous oxide, together with the coefficients available in the literature [5][6][7][8][9][10], are reported elsewhere [1]. For second virial coefficients the comparisons at the same reduced temperatures showed fair agreement, considering also the mutual uncertainties, with the sources.…”

“…The pressure distortion of the Burnett cells was taken into account, as explained elsewhere [3]. A summary of the second and third virial coefficients obtained for the pure compounds [1,2] are reported in Table I. These results were adopted in the present work because the same samples were used for the mixture measurements.…”

“…In our recent papers, the virial coefficients for the two pure compounds were derived from experimental measurements [1,2]. Fourteen Burnett runs along 7 isotherms from 283 to 363 K and in a pressure range from 4500 to 150 kPa were reported for nitrous oxide in Ref.…”

“…Fourteen Burnett runs along 7 isotherms from 283 to 363 K and in a pressure range from 4500 to 150 kPa were reported for nitrous oxide in Ref. 1, while nine series along 5 isotherms were collected in the temperature range from 303 to 343 K and for pressures from 125 to 4370 kPa for difluoromethane in Ref. 2.…”

Virial Coefficients from Burnett Measurements for the R23 + N2O System

“…In recent papers [1,2], virial coefficients for the two pure compounds were obtained from experimental measurements. We described 14 Burnett runs along 7 isotherms from 283 to 363 K in a range of pressures from 4500 to 150 kPa for nitrous oxide in [1], while [2] concerns 9 series collected for trifluoromethane along 5 isotherms at temperatures ranging between 303 and 343 K and pressures from 130 to 6000 kPa.…”