THE SYSTEM HYDROGEN - WATER UP TO 440-DEGREES-C AND 2500 BAR PRESSURE
THE SYSTEM HYDROGEN - WATER UP TO 440-DEGREES-C AND 2500 BAR PRESSURE
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DOI：
10.1002/bbpc.19810850103
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发表时间：
1981-01-01
期刊：
影响因子：
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通讯作者：
FRANCK, EU
中科院分区：
文献类型：
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作者：
SEWARD, TM;FRANCK, EU
H2- H2O系统已经在0.5至90 mol- % H2和高达440°C和2500 bar压力下进行了等容研究，使用包含两个蓝宝石窗口的高压釜，通过该窗口可以在升高的温度和压力下观察到相变。- 该系统被发现表现出所谓的“气-气”不相容性，临界曲线从纯水的临界点向更高的温度和压力前进。在这些实验的范围内，H2-H2O混合物的临界温度与纯水的临界温度相比变化不大（例如，对于38 mol- % H2，Tc= 381.3°C atpc= 2520 bar）。在均相区进行了pVT测量，并计算了400°C和不同压力下的过量体积。在300 bar时，过量体积相对较大且为正值（例如，在40 mol- % H2时VE= 58.0 cm 3 mol − 1），而在2500 bar时，H2-H2O混合物的过量体积仅表明与理想状态的较小正或负偏离。
The system H2— H2O has been studied isochorically from 0.5 to 90 mol‐% H2and up to 440°C and 2500 bar pressure using an autoclave containing two sapphire windows through which phase transitions could be observed at elevated temperatures and pressures. — The system was found to exhibit so‐called “gas‐gas” immiscibility with a critical curve proceeding to higher temperatures and pressures from the critical point of pure water. Within the range of these experiments, the critical temperature of H2—H2O mixtures does not change greatly from that of pure water (e.g.Tc= 381.3°C atpc= 2520 bar for 38 mol‐% H2).pVTmeasurements have been made in the homogeneous region and excess volumes have been calculated at 400°C and at different pressures. At 300 bar, the excess volumes are relatively large and positive (e.g.VE= 58.0 cm3mol−1at 40 mol‐% H2) whereas at 2500 bar, excess volumes of H2—H2O mixtures indicate only small positive or negative departures from ideality.