Phase Behavior, Densities, and Isothermal Compressibility of CO2 + γ-Valerolactone Systems in Various Phase Regions
Phase Behavior, Densities, and Isothermal Compressibility of CO2 + γ-Valerolactone Systems in Various Phase Regions
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DOI：
10.1021/je8007759
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发表时间：
2009-01
影响因子：
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通讯作者：
Yucui Hou;Weize Wu;M. Poliakoff
中科院分区：
文献类型：
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作者：
Yucui Hou;Weize Wu;M. Poliakoff
用高压变体积观察池和光纤反射仪测量了CO_2和γ-戊内酯的相行为。还测量了二元混合物的密度，并由二元混合物的密度计算了二元混合物的等温压缩系数(KT)。在(308.2~550.2)K温度范围内，测量了GVL摩尔分数在0.01K~0.15K范围内的相变点、泡点、露点和临界点。混合物的密度对临界点附近的压力很敏感，当压力接近相变点，特别是接近临界点时，KT也对压力敏感。当压力远高于相分离压力或组成远离临界组成时，KT很小，压力对KT的影响非常有限。用该方法可以很好地关联二元混合物的相界数据。
The phase behavior of CO2 and γ-valerolactone (GVL) has been measured using a high-pressure variable-volume view cell and a fiber optic reflectometer. The density of the binary mixture has also been measured, and the isothermal compressibility (KT) of the binary mixture was calculated from the density of the binary mixture. The phase transition points, bubble point, dew point, and critical point, have been measured on the range of GVL mole fraction from 0.01 to 0.15 and temperatures from (308.2 to 550.2) K. The density of the mixture is sensitive to the pressure near the critical point of the mixtures, and KT is also sensitive to the pressure when the pressure is close to the phase transition point, especially close to the critical point. When the pressure is much higher than the phase separation pressure or the composition is far from the critical composition, KT is very small and the effect of pressure on KT is very limited. The phase boundary data of the binary mixture can be correlated well by the Pen...