Kinetic and Transport Processes in Supercritical Fluid Extraction

该项目涉及使用加州大学实验室开发的实验技术进行超临界流体萃取的研究。在超临界条件下，用滞流和流动色谱测定了各种溶剂-溶质体系的输运和平衡性质。采用阻流技术测定了二元体系和颗粒内的扩散系数，并用流动色谱法测定了分散系数、平衡吸附系数和吸附速率系数。研究的第二部分是对提取过程的考察。特别是，将测量含有咖啡因的活性碳和其他与二氧化碳和甲苯等溶剂吸附的物质的再生率。

This project involves a study of supercritical fluid extraction with experimental techniques developed in the University of California laboratories. Arrested-flow and flow chromatography are used to measure transport and equilibrium properties for various solvent-solute systems at supercritical conditions. Binary bulk and intraparticle diffusivities are determined using the arrested-flow technique; and flow chromatography is applied to the measurement of dispersion, equilibrium adsorption, and adsorption rate coefficients. The second part of the study is the investigation of extraction processes. In particular, rates of regeneration will be measured for activated carbon containing caffeine and other adsorbates with solvents such as carbon dioxide and toluene.