Research Equipment: Diffusion of Aromatic Hydrocarbons in Dense Fluids up to the Supercritical Region

采用Taylor-Aris分散法测定了芳烃溶质（如芘、2,3苯并蒽、荧光蒽和苯并(a)芘）在极性和氢键溶剂（包括乙醚、乙腈、甲醇、乙醇和异丙醇）中至超临界区域的二元示踪剂分子扩散率。目的是提供一个广泛的数据库，以进一步了解致密流体中的扩散过程，特别是在超临界分离条件下，并为预测目的建立工程相关性。本文还尝试了一系列聚苯乙烯标准品在超临界稠密正戊烷和正戊烷/甲醇（95:5）混合物中的扩散测量。将采购一台高压（高达5,000 psig）紫外-可见差示吸收探测器，并投入使用，以扩大现有仪器的能力。

The Taylor-Aris dispersion method is employed to determine the binary tracer molecular diffusivities of aromatic hydrocarbon solutes, such as pyrene, 2,3 benzanthracene, fluoranthene and benzo (a) pyrene, in polar and hydrogen-bonded solvents including diethyl ether, acetonitrile, methanol, ethanol, and isopropanol up to the supercritical region. The objective is to provide an extensive data base to gain further insights into the diffusion process in dense fluids, particularly under supercritical separation conditions, and to develop engineering correlations for predictive purposes. The diffusion measurements on a series of polystyrene standards in supercritical dense n-pentane and a n-pentane/methanol (95:5) mixture are also attempted. A high pressure (up to 5,000 psig) UV-VIS differential absorbance detector will be procured and put into operation to expand the capability of existing apparatus.