Abstract: An experimental device based on the Taylor dispersion principles was used to determine the diffusion coefficients in a supercritical fluid. The diffusion coefficients for benzene and seven n - alcohols in supercritical carbon dioxide were reported,with a temperature range 313. 0 to 343. 2 K and pressure, 8. 0 to 16. 1 MPa. Moreover, three correlation equations were tested extensively in terms of the data for 63 systems (817 points) from literature and this work. It has been found that the Liu -Wang -Lu Model and Modified Fujita Model proposed in this work give satisfactory results.

摘要： 建立了测定超临界流体中无限稀释扩散系数的实验装置。在313.2～343.2K、8.1～16.0MPa内测定了苯及文献中尚未报道的7种低级脂肪醇在超临界CO_2中的无限稀释扩散系数,共144个数据点。应用本装置测定的数据及文献报道的各类体系的数据(计63个体系,817个点),考察了现有的几种模型及本文提出的简化的自由体积模型。