Isochoric p-ρ-T Measurements on (x) CO2 + (1-x) C2H6, xapproximately equal to} 0.25, 0.49, 0.74} From 200 to 400 K at Pressures to 35 Mpa

Published

October 1, 2001

Author(s)

H Duarte, Joe W. Magee

Abstract

The p-p-T relationships were measured for binary hydrocarbon mixtures containing carbon dioxide (CO₂) and ethane (C₂H₆). Temperatures ranged from 200 K to 400 K with pressures up to 35 MPa. Measurements of p-p-T were conducted on compressed gaseous and liquid samples with the mole fraction compositions (x) CO₂ + (1-x) C₂H₆} for x = 0.25168, 0.49233, and 0.73979. These mixtures were prepared gravimetrically to match, within 0.000 12 mole fraction, the compositions (0.251 66, 0.492 45, 0.739 78) of three mixtures which had been used by three labororatories for measurements of key thermophysical properties, including the density. For the p-p-T apparatus used in this study, the uncertainty of the temperature is 0.03 K, and for pressure it is 0.01% at p > 3 MPa and 0.05% at p < 3 MPa. The principal source of uncertainty in density is the cell volume (28.5 cm³) whose standard uncertainty is 0.003 cm³. When all components of experimental uncertainty are considered, the expanded relative uncertainty (with a coverage factor k=2 and thus a two-standard-deviation estimate) of the density measurementsis estimated to be 0.05%.

Citation

Journal of Chemical and Engineering Data

Volume

46

Issue

No. 5

Pub Type

Journals

Keywords

carbon dioxide, density, ethane

Citation

Duarte, H. and Magee, J. (2001), Isochoric p-&#961;-T Measurements on {(x) CO₂ + (1-x) C₂H₆, x{approximately equal to} 0.25, 0.49, 0.74} From 200 to 400 K at Pressures to 35 Mpa, Journal of Chemical and Engineering Data (Accessed December 30, 2024)