當我們在處理一般中低壓下的相平衡問題時，並不會考慮Poynting factor 的影響，而隨著壓力的增加，Poynting factor 的影響愈加明顯，甚側是達到了劇烈地變化，為什麼會產生這種現象?相關的參考文獻也是非常的貧乏，所以本篇論文的主要目的是希望對Poynting factor 作進一步的研究。
本篇論文採用三種葯品分別為|Benzoic acid、Phenanthrene、2,3 —Dimethylhexane，作為探討壓力對Poynting factor 之間的影響關係，以期從中獲得對高壓相平衡的更多更有利的知識，尤其是在超臨界流體的運用愈來愈廣泛的同時，我們也希望能對其有更全面的認識，由本實驗結果我們發現fP著壓力的升高而有高，而且高溫反而使其得到較低的fP值

Do not take Poynting factor into consideration when we deal with questions of the phase equilibrium of low-moderative pressure. However, the more pressure increases, the more affect Poynting factor dose. Drastically, it would be reach the changes. Why does it produce the phenomenon? These kinds of references are hard to find.
The main idea of the theory is on Poynting factor and do it further research. The theory adapts three component names: Benzoic acid, Phenanthrene, and 2,3-Dimethylhexane. In order to get more knowledge and more advantages from the phase equilibrium of high-modrative pressure, we use these three component names to discuss what’s the relationship between pressures to Poynting factor? Operating Supercritical fluid is more popular, we hope we have well-round knowledge at the same time. By the way, ran by results of experiment, we found, while pressure go up then Poynting factor dose, meanwhile the high temperature even has lower Poynting factor.

Chen, P. C., M. Tang, and Y. P. Chen “Calculations of the Solubilities of Solids in Supercritical Fluids Using the Peng-Bobinson Equation of State and a Modified Mixing Model,” Ind. Eng. Chem. Res., 34, 1, pp. 332-339 (1995)
Huron, M. J., and J. Vidal “New Mixing Rules in Simple Equations of State for representing Vapor-Liquid Equilibrate of Strongly Non-Ideal Mixing,” Fluid Phase Equilibria, 3, pp 255-271 (1979)
Lee, L. S., J. H. Fu, H. L. Fu, “Measurement and Correlation of Solubilities of Solid 1,4-Dimethoxybenzene in Carbon Dioxide,” J. Chem. Eng. Data. (2000) in press.
Lydersen, A. L. In W. J. Lyman, W. F. Reehland D. H. Rosenblatt(Eds.) “Handbook of Chemical Property Estimation Methods,” McGraw-Hill, New York, Chapter 12, 19 (1982)
Peng, D. Y., and D. B. Robinson “A New two-Constant Equation of State,” Ind. Eng. Chem. Fundamen., 15, 1, pp 59-64 (1976)
Reid, R.C., J. M. Prausnitz, and B. E. Poling “The Properties of Gases and Liquids,” 4th ed., McGraw-Hill book co., New York, (1987)
Reverchon, E. C., J. M. S. Kwong, “Solubility of Two Monoterpenes in supercritical Carbon Dioxide,” J. Chem. Eng. Data, 38,458-465 (1993)
T. Y. Ksak and G. A. Mansoori “Van Der Waals Maxing Rules for Cubic Equations of State. Applications for Supercritical Fluid Extraction Modeling,” Chemical Engineering science., 41, pp 1303-1309. (1996)
Zlger, D. H., and C. A. Eckert “Correlation and Prediction of Solid-supercritical Fluid Phase Equilibria.,” Ind. Eng. Chem. Process Des. Dev., 22, pp 582-588 (1983)