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Estimate of the Vapor Pressure of Squalane at Approximately 293 K Using a Knudsen Cell Method
Journal of Chemical & Engineering Data ( IF 2.0 ) Pub Date : 2021-03-09 , DOI: 10.1021/acs.jced.0c00914 William H. Gourdin 1
Journal of Chemical & Engineering Data ( IF 2.0 ) Pub Date : 2021-03-09 , DOI: 10.1021/acs.jced.0c00914 William H. Gourdin 1
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I report the vapor pressure of squalane hydrocarbon (2,6,10,15,19,23-hexamethyltetracosane, C30H62) estimated from a statistical analysis of multiple weight loss measurements of Knudsen cells with orifice diameters of 4 and 8 mm exposed in vacuum for aggregated durations 5400 and 2400 h, respectively, at 293.61 ± 1.47 K. The estimated vapor pressure pv = (4.15 ± 0.17) × 10–6 Pa is more than a factor of 6 larger than the value of ∼6.5 × 10–7 Pa derived from estimates reported in the literature. Plausible systematic errors cannot account for this discrepancy, which suggests that the vapor pressure of squalane at temperatures near 293.61 K may be substantially higher than previously estimated. Empirical equations for the vapor pressure of squalane are proposed for the temperature range 293.61 K ≤ T ≤ 795.9 K.
中文翻译：
使用Knudsen池法估算大约293 K时角鲨烷的蒸气压
我报告了角鲨烷烃（2,6,10,15,19,23-六甲基四氢六烷，C 30 H 62）的蒸气压，该蒸气压是通过对暴露于孔口直径为4和8 mm的Knudsen细胞进行多次失重测量的统计分析得出的在真空中的总持续时间分别为5400和2400 h，为293.61±1.47K。估计的蒸气压p v =（4.15±0.17）×10 –6 Pa，比约6.5×值大6倍。 10 –7Pa从文献报道的估算值中得出。可能的系统误差无法解释这一差异，这表明在接近293.61 K的温度下，角鲨烷的蒸气压可能大大高于先前的估计值。为角鲨烷的蒸气压的经验公式，提出了温度范围293.61ķ≤ Ť ≤795.9 K.
更新日期：2021-04-08
中文翻译：
使用Knudsen池法估算大约293 K时角鲨烷的蒸气压
我报告了角鲨烷烃（2,6,10,15,19,23-六甲基四氢六烷，C 30 H 62）的蒸气压，该蒸气压是通过对暴露于孔口直径为4和8 mm的Knudsen细胞进行多次失重测量的统计分析得出的在真空中的总持续时间分别为5400和2400 h，为293.61±1.47K。估计的蒸气压p v =（4.15±0.17）×10 –6 Pa，比约6.5×值大6倍。 10 –7Pa从文献报道的估算值中得出。可能的系统误差无法解释这一差异，这表明在接近293.61 K的温度下，角鲨烷的蒸气压可能大大高于先前的估计值。为角鲨烷的蒸气压的经验公式，提出了温度范围293.61ķ≤ Ť ≤795.9 K.
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