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超临界流体广泛地应用于能源动力、制冷空调等多个领域,而固体在超临界流体中的溶解度对于工业过程有较大的影响。工程上常用状态方程计算溶解度,本文将结合了重整化群理论的RG-CPA方程推广到了溶解度的计算中,RG-CPA方程能够准确地描述流体在近临界和远临界区域的热力学性质,有效地克服了经典立方型状态方程无法准确描述近临界区域热力学性质的缺点。采用该方法对7种有机固体在超临界CO_2中的溶解度进行了计算,并与经典方程进行了比较。结果表明,与经典方程相比,RG-CPA方程能更好地再现极接近临界点处溶解度的陡峭变化规律。
The supercritical fluid is widely used in many fields such as energy power, refrigeration and air conditioning, and the solubility of solid in supercritical fluid has a greater impact on industrial processes. The equation of state is usually used to calculate the solubility. In this paper, the RG-CPA equation combining the renormalization group theory is extended to the solubility calculation. The RG-CPA equation can accurately describe the thermodynamic properties of the fluid in the near-critical and far- Overcomes the shortcomings that the classical cubic state equation can not accurately describe the thermodynamic properties of the near-critical region. The solubility of seven kinds of organic solids in supercritical CO_2 was calculated by this method and compared with the classical equation. The results show that the RG-CPA equation can better reproduce the steep change of solubility near the critical point compared with the classical one.