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从分子热力学基础出发提出一个适用于固体-超临界流体相平衡的理论模型，溶液中溶质的化学位分解为无限稀溶液化学位及溶质浓度效应两部.无限稀溶液化学位由简化的Oz方程计算，其中包括斥力贡献、局部组成及长程引力项浓度对化学位的贡献由作者根据Kirkwood-Buff溶液理论提出的修正Wilson模型计算．用45个二元系862个数据点对此模型进行检验并和PR方程（vdw-2混合规则）计算结果进行比较，本模型的平均绝对误差为11.7％，而PR方程的结果为14.9％，对极性溶剂体系的计算结果有显著改善.用此模型直接推算的萘-Co_2体系萘的偏摩尔焓和文献数据相吻合
Based on the molecular thermodynamics, a theoretical model suitable for the phase equilibrium of solid-supercritical fluid is proposed, in which the chemical position of the solute is decomposed into infinitesimal dilute solution chemical concentration and solute concentration effect. The infinitesimal dilute solution chemical position is represented by a simplified Oz equation Calculations, including repulsive contribution, local composition and contribution of long-range gravitation concentration to chemical sites are calculated by the author based on the modified Wilson model proposed by Kirkwood-Buff solution theory. This model was tested with 452 binary system 862 data points and compared with the PR equation (vdw-2 mixing rule). The average absolute error of this model was 11.7%, while the PR equation was 14.9% The calculated results for the polar solvent system are significantly improved.The partial molar enthalpy of the naphthalene-Co 2 system deduced directly by this model is in agreement with the literature data