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

用Taylor-Aris弥散法测定了二元示踪分子扩散系数，得到了二元示踪剂分子在极性和氢键的乙醚、乙腈、甲醇、乙醇和异丙醇中的扩散系数。其目的是提供一个广泛的数据库，以进一步深入了解稠密流体中的扩散过程，特别是在超临界分离条件下，并开发用于预测目的的工程关联。还尝试了一系列聚苯乙烯标准物质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-可见光差示吸收检测器并投入使用，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.