Saturated Vapor Pressure of Isobutane and <i>n</i>-Butane in High Pressure Regions

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  • 高圧領域におけるイソブタンおよび<i>n</i>-ブタンの飽和蒸気圧

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Saturated vapor pressures of n-butane and isobutane in high pressure regions were measured in detail up to Tr=0.944 for n-butane and Tr=0.916 for isobutane.<br>From observed temperature-pressure relations, the following three constants of Antoine equation were determined;<br>A=7.670088, B=-1, 534.0461, C=324.6567 (55∼130°C) for n-butane<br>A=7.303160, B=-1, 204.1271, C=284.9782 (20∼110°C) for isobutane.<br>Comparisons of literature values of many workers for n-butane show that the data of Seibert and Burrell17), Dana, Jenkins, et al.5), Sage, Webster and Lacey16), and Griswold and Brooks7) are a few per cent higher than that of more accurately determined results of Beattie, Simard and Su1), Olds, Reamer, Sage and Lacey12), and recently presented data of Connolly4) which agree very closely with our experimental results. For isobutane, the data of Griswold and Brooks7), Sage and Lacey15), and Connolly4) agree with the authors results within 0.4%, and all of these data were concluded to be thermodynamically consistent data.

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