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Application of a Two-Sinker Densimeter for Phase-Equlibrium Meaurements: A New Technique for the Detection of Dew Points with Application to the (Methane + Propane) System

Published

Author(s)

Mark O. McLinden, Markus Richter

Abstract

We explore a novel method for determining the dew-point density and dew-point pressure of fluid mixtures and compare it to traditional methods. The (p, ρ, T, x) behavior of three (methane + propane) mixtures was investigated with a two-sinker magnetic suspension densimeter over the temperature range of (248.15 to 293.15) K; the measurements extended from low pressures into the two-phase region. The compositions of the gravimetrically prepared mixtures were (0.74977, 0.50688, and 0.26579) mole fraction methane. We analyzed isothermal data by: (1) a “traditional” analysis of the intersection of a virial fit of the (p vs. ρ) data in the single-phase region with a linear fit of the data in the two-phase region; and (2) an analysis of the adsorbed mass on the sinkers. We compared these to a traditional isochoric experiment. We conclude that the “adsorbed mass” analysis of an isothermal experiment provides an accurate determination of the dew-point temperature, pressure, and density. However, a two-sinker densimeter is required.
Citation
Journal of Chemical Thermodynamics
Volume
99

Keywords

adsorption, dew point, experimental uncertainty, gas density, measurements, methane, propane

Citation

McLinden, M. and Richter, M. (2016), Application of a Two-Sinker Densimeter for Phase-Equlibrium Meaurements: A New Technique for the Detection of Dew Points with Application to the (Methane + Propane) System, Journal of Chemical Thermodynamics, [online], https://doi.org/10.1016/j.jct.2016.03.035 (Accessed April 17, 2024)
Created March 22, 2016, Updated November 10, 2018