Vapour pressure of butane from 173 to 280 K

Measurement of the (p,ρ,T) relation of propane, propylene, n-butane, and isobutane in the temperature range from (95 to 340) K at pressures up to 12 MPa using an accurate two-sinker densimeter

“…In the lower diagram, the vapour pressure measurements of Machin and Golding [81] agree with our results within the uncertainty of our values for T 6 260 K, but for higher temperatures they show increasing deviations of up to 0.17%. For temperatures from about (270 to 340) K, the results of four further studies [82][83][84][85] differ systematically from our values.…”

“…within ±0.03% in most cases, which is clearly inside their claimed uncertainty. Figure 6 presents a comparison between the experimental results on the coexistence curve of n-butane [44][45][46][48][49][50]53,54,[79][80][81][82][83][84][85] and values calculated from correlation equations of Bü cker and Wagner [26]. With regard to the saturated-liquid densities, the previous data situation is similar to that for propane.…”

“…; d, this work; s, this work, calculated values (see table 6 and section 3); =, McClune[44]; þ, Orrit and Laupretre[45]; n, Haynes and Hiza[46]; , Kaminishi et al[48]; , Kahre[49]; h, Sliwinski[50]; , Holcombe et al[79]; Â,Kay [80]; , Tickner and Lossing[53]; , Carruth and Kobayashi[54]; ., Machin and Golding[81]; , Holldorf and Knapp[82];¯, Martinez-Oritz and Manley[83]; , Flebbe et al[84]; e, Kratzke et al[85]; ---, values calculated from the equation of state of the ideal gas by means of the vapour pressure p r ; -AE -, values calculated from the equation of state of Younglove and Ely[33], and ---, values calculated from the equation of state of Miyamoto and Watanabe[36] are plotted for comparison. The grey area corresponds to the experimental uncertainty of the measurements of this work.…”

Measurements of vapour pressures and saturated-liquid densities for n-butane at T= (280 to 424) K

“…However, such new sets of data for vapour pressures and saturated-liquid densities are not in good agreement with each other. Moreover, vapour-pressure data by Glos et al [17] agree with the data by Machin and Golding [10] and show larger deflections to the data by Kratzke et al [8]. The saturated-liquid density data by Glos et al [17] also show systematic discrepancies with the data by Orrit and Laupretre [14] in temperatures above 240 K and agree with the data by Sliwinski [11] at higher temperatures above 285 K. Such situations cause confusion to the selection of the input data for the modeling, and provide one of the motivations to carry out the present measurements, which cover a wider range of temperatures.…”

“…These models have been developed based on almost the same sets of data as input data for the fitting. As for the vapour pressures, the reliable data by Kratzke et al [8] at T = (320 to 423) K have been adopted for these three modelling, and are in good agreement with data by Flebbe et al [9] reported in the temperature range from 278 K to 358 K. Over the lower ranges of temperatures, Machin and Golding [10] have obtained a total of 224 points of vapour pressures at temperatures down to 173 K. On the other hand, as for the saturated-liquid densities, the well-known data by Sliwinski [11] have been adopted for aforementioned three modeling in the higher range of temperatures above 283 K. Two sets of literature data by Kay [12] and Olds et al [13], at T = (325 to 425) K and at T = (311 to 411) K, respectively, show scatter deflections to the data of Sliwinski. Over the lower temperature range below 275 K, a total of 50 points of reliable data by Orrit and Laupretre [14] were useful for the modeling, and two other sets of data by McClune [15] and Haynes and Hiza [16] are in good agreement with the data of Orrit and Laupretre.…”