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利用具有光学宝石窗和电磁搅拌的高压釜测定了正了烷和异丁烷两个含水体系高温高压下的相平衡数据．温度和压力范围分别为５００Ｋ到６６０Ｋ和１０ＭＰａ到３００ＭＰａ左右．两个体系的临界曲线都是从纯水的临界点开始，首先趋向于较高压力和较低温度，经过一个温度最小值然后伸向高温高压方向．两个体系的温度极小值分别为６２４Ｋ和６２５Ｋ．还给出了相界面上的过剩体积．实验结果与其正烷烃－水体系的临界数据进行了比较． 相似文献
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Vapor-liquid equilibrium data are important forthe design, development, and operation of supercriti-cal fluid separation processes[1].The main method forobtaining phase equilibrium data is experimentation.Most published articles on high-pressure fluid-phaseequilibrium experimental methods focus on supercriti-cal (SC) carbon dioxide because of its low criticaltemperature and pressure, nontoxicity, and lowcost. A feature of SC fluids is that their densities anddensity-dependentproperties are s… 相似文献
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利用一个从微扰理论出发得到的含有斥力项和引力项的状态方程计算６个二元系统的临界曲线,这些曲线一直延伸到很高的压力和温度．分子间力采用方阱模型,在势能计算的混合规则中仅需３个可调节参数．计算结果表明,运用状态方程预测的临界曲线、临界压力－组成关系以及摩尔体积与实验结果有很好的一致性． 相似文献
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The critical curves for binary systems of methane combined with nitrogen, carbon monoxide, carbon dioxide, ethane, propane,
butane and water at temperatures from 125 K to 650 K and pressures from 3.5 MPa to 250 MPa were calculated by using Heilig-Franck
equation of state. This equation of state contains a repulsion term and an attraction term for intermolecular interaction.
With pairwise combination rules for these potentials, three adjustable parameters are needed. The results showed that the
critical curves of the former six binary systems belonged to type I, and CH4+H2O system belonged to type III. The calculated data were compared with the experimental data, which yielded good results for
the pressure-temperature, pressure-composition and temperature-composition behaviors of the seven systems. Moreover, the values
of the adjustable parameters were obtained from the calculation of the critical curves. They can also be used for other relevant
calculation. 相似文献
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