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对超临界ＣＯ２ 和脂肪酸及其酯相平衡计算问题进行了研究。用Ｐｅｎｇ－Ｒｏｂｉｎ－ｓｏｎ 状态方程和Ｐａｎａｇｉｏｔｏｐｏｕｌｏｓ－Ｒｅｉｃ混合规则，以及对能量参数ａ（Ｔ）做了改进后，用于计算脂肪酸及其酯和超临界ＣＯ２ 二元体系的相平衡，理论计算与实验数据拟合精度很好。此模型可为用超临界ＣＯ２ 萃取脂肪酸及其酯的工业化设计提供理论依据。
The calculation of the equilibrium between supercritical CO2 and fatty acids and their esters was studied. The Peng-Robin-son equation of state and the Panagiotopoulos-Reic mixing rule are used to calculate the phase equilibrium of the fatty acid and its ester and supercritical CO2 binary system after the improvement of the energy parameter a (T). The theoretical calculations and experiments Data fitting accuracy is very good. This model can provide a theoretical basis for the industrial design of fatty acid and its esters extracted by supercritical CO2.