Thermal Properties and Phase Behavior of Water - n-pentane and Water -n-hexane Systems

S. Rasulov, I. A. Isaev, S. Orakova
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Abstract

The pvTx properties of H2O-n-C5H12 and H2O-n-C6H14 mixture have been measured in the temperature interval 303-680 K and pressure up to 60 MPa. Measurements were made along 265 liquid and vapor isochors in the density range 63-713 kg/m3. Measurements were made for 15 concentrations between 0.110 and 0.987 mole fraction of H2O for mixtures with C5H12 and 11 concentrations between 0.166 and 0.977 for mixtures with C6H14. The temperatures and pressures at the three-phase and two-phase boundary curves for the mixtures were obtained using the isochoric (p-T) break point technique. The critical properties data of the upper and lower branches of the critical curves were extracted from the derived phase boundary data. The measured three-phase data were used to estimate the value of the upper critical end point.
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水-正戊烷和水-正己烷体系的热性质和相行为
对H2O-n-C5H12和H2O-n-C6H14混合物的pvTx性能进行了测试,温度范围为303 ~ 680 K,压力为60 MPa。沿着密度范围为63-713 kg/m3的265条液体和蒸汽等色线进行测量。测量了15种浓度在0.110 ~ 0.987摩尔分数之间的C5H12混合物和11种浓度在0.166 ~ 0.977摩尔分数之间的C6H14混合物。采用等时(p-T)断点技术,得到了混合物三相和两相边界曲线上的温度和压力。从导出的相边界数据中提取临界曲线上、下分支的临界性质数据。测量的三相数据用于估计上临界终点的值。
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