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本文将(I)报中提出的简易方程式推广应用到823K和100MPa的NaCl水溶液,NaCl的最高浓度达65.2wt%(三相点时的饱和溶解度)下热力学性质的计算.这些热力学性质包括溶液中水的活度、氯化钠的平均离子活度系数、溶液的Gibbs自由能,计算值与实验值吻合较好.文中列出了不同温度压力下的w和△_8G_2~0/RT值及其变化曲线、和本文提出的参考压力值P_r,为高温高压下电解质水溶液的研究作了初步的探索. 相似文献
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本文提出了一个简易的热力学方程式,式中仅包含一个表示长程作用力的静电项,再加上一个表示两粒子间的短程作用项,即可用以计算温度为373—573K,压力为0.1—100MPa、氯化钠浓度为0—10.4mol/kgH_2O的水溶液中氯化钠和水两者的活度系数,计算简便,易于推广使用. 相似文献
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In the design of chemical processes, such as catalytic cracking of bitumen and heavy oil, the knowledge of phase behavior at the critical endpoint is essential. Based on the PR equation of state, the algorithm developed by Heidemann and Khalil for calculating critical properties was used to compute critical points. An algorithm for determining the equilibrium phase of the critical point using the tangent plane criterion was developed, and was used to calculate the critical endpoints of different mixtures, including non-polar, polar and associating systems. The critical endpoint, representing the type of the phase behavior, was employed to fit the interaction parameter of mixtures in critical state at high pressure. Lines of critical endpoints for ternary mixtures were also determined with the algorithm. 相似文献
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Self-diffusion coefficients of exponential-six fluids are studied using equilibrium molecular dynamics simulation technique. Mean-square displacements and velocity autocorrelation functions are used to calculate self-diffusion coefficients through Einstein equation and Green-Kubo formula. It has been found that simulation results are in good agreement with experimental data for liquid argon which is taken as exponential-six fluid. The effects of density, temperature and steepness factor for repulsive part of exponential-six potential on self-diffusion coefficients are also investigated. The simulation results indicate that the self-diffusion coefficient of exponential-six fluid increases as temperature increases and density decreases. In addition, the larger self-diffusion coefficients are obtained as the steepness factor increases at the same temperature and density condition. 相似文献
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THERMODYNAMICS OF AQUEOUS SODIUM CHLORIDE SOLUTIONS AT HIGH TEMPERATURES AND PRESSURES(Ⅰ)THERMODYNAMIC PROPERTIES OVER 373—573 K AND 0.1—100 MPA
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Sodium ehloride 15 the main eomPonent in seawater,the imPortant raw material in manyindustrial systems and also the imPortant eonstituent under the earth,5 erust.In a Polarsolvent,NaCI 15 a tyPieal ionie eleetrolyte.50 the study of the thermodynamie ProPe… 相似文献