Critical loci of binary mixtures of propane with methane, carbon dioxide, and nitrogen

Abstract

The minimum pressure of miscibility was determined by observations in a windowed cell for systems of propane with methane, carbon dioxide, and nitrogen, as functions of composition and temperature.

A re-entrant resonator for the measurement of phase boundaries: dew points for {0.4026CH4+0.5974C3H8}

“…The p d predicted by NIST14 differ from PR SPECS by between 0.67 and 0.96 % while both SRK estimates lie 0.4 % above at T = 315 K and these differences diverge from PR SPECS and our results to be À2.5 % at T = 337 K that is about a factor of 5 greater than the estimated expanded uncertainty of our measurements. To our knowledge, there are only eight publications [8][9][10][11][12][13][14][15] that report the dew pressure of {(1 À x)CH 4 + xC 3 H 8 } as a function of (1 À x) at temperatures in the range (273 to 363) K and all are shown in figure 7 with those listed in table 1. The results reported by May et al [14], from measurements with a dual-sinker densimeter, and those of May et al [15], with a version of the re-entrant cavity optimised to determine ratio of the gas-to-liquid volume within the two-phase region, are both for (1 À x) > 0.75 and cannot be compared directly with our results.…”

“…The operation of the re-entrant cavity is demonstrated with measurements of the dew pressure for {0.4026CH 4 + 0.5974C 3 H 8 } at temperatures in the range (315 to 340) K. There are eight publications [8][9][10][11][12][13][14][15] that report the phase behaviour of {(1 À x)CH 4 + xC 3 H 8 } at temperatures in the range (273 to 363) K. References [8][9][10][11][12][13] report results obtained from (p, V, T, x) measurements, while [14] reports dew pressures obtained with a dual-sinker densimeter. May et al [15] used a re-entrant cavity modified to optimise the determination of liquid drop-out-volume with a resonance at frequencies of GHz.…”

A novel EOS that combines van der Waals and Dieterici potentials

“…These parameters need to be evaluated using experimental data to Solid lines: data predicted by Eq. 11; dotted lines: data predicted by the RK-Twu EOS; F: N 2 (1)-C 2 H 6 (2): experimental data of Eakin et al (1955); E: N 2 (1)-C 3 H 8 (2): experimental data of Roof and Baron (1967) and Schindler et al (1966); : N 2 (1)-n-C 4 H 10 (2): experimental data of Roberts and McKetta (1961) and Lehigh and McKetta (1961); ƒ: N 2 (1)-n-C 5 H 12 (2): experimental data of Wisotzki and Schneider (1985); OE: N 2 (1)-n-C 6 H 14 (2): experimental data of Poston and McKetta. (1966b); ‚: N 2 (1)-n-C 7 H 16 (2): experimental data of Peter and Eicke (1970).…”

“…Solid lines: data predicted by Eq. 11; dotted lines: data predicted by the RK-Twu EOS; dot-dot-dashed lines: vapor pressure lines of pure compounds; Ⅺ: CH 4 (1)-C 2 H 6 (2): experimental data of Bloomer et al (1953); f: CH 4 (1)-C 3 H 8 (2): experimental data of Price and Kobayashi (1959), Roof and Baron (1967), and Wichterle and Kobayashi (1972); E: CH 4 (1)-n-C 4 H 10 (2): experimental data of Roberts et al (1962) and Elliot et al (1974); F: CH 4 (1)-n-C 5 H 12 (2): experimental data of Chen et al (1978) and Sage et al (1942); ‚: CH 4 (1)-n-C 6 H 14 (2): experimental data of Poston and McKetta (1966a) and Lin et al (1977); OE: CH 4 (1)-n-C 7 H 16 (2): experimental data of Reamer et al (1956) and Chang et al (1966); : CH 4 (1)-n-C 9 H 20 (2): experimental data of Shipman and Kohn (1966). Solid lines: data predicted by Eq.…”

“…Solid lines: data yielded by the Eq. 11; dotted lines: data yielded by the RK-Twu EOS; dot-dot-dashed lines: vapor pressure lines of pure compounds; OE: CH 4 (1)-n-CO 2 (2): experimental data of Donnelly and Katz (1954); ‚: CO 2 (1)-n-C 2 H 6 (2): experimental data of Horstmann et al (2000); F: CO 2 (1)-n-C 3 H 8 (2): experimental data of Roof and Baron (1967); E: CO 2 (1)-n-C 4 H 10 (2): experimental data of Hsu et al (1985) and Leu and Robinson (1987); : CO 2 (1)-n-C 5 H 12 (2): experimental data of Cheng et al (1989); ƒ: CO 2 (1)-n-C 6 H 14 (2): experimental data of Ziegler et al (1995); f: CO 2 (1)-n-C 7 H 16 (2): experimental data of Chester and Haynes (1997); Ⅺ: CO 2 (1)-n-C 8 H 18 (2): experimental data of Ziegler et al (1995); ✚: CO 2 (1)-n-C 10 H 22 (2): experimental data of Chester and Haynes (1997).…”