This paper presents new experimental results on the separation of an o-dichlorobenzene/p-dichlorobenzene mixture in a continuous moving crystal bed crystallization column under the top-fed operation mode. Local concentration distributions of the binary eutectic mixture were investigated as a function of the feed composition, reflux ratio, crystal bed height, and internal stirring speed. It is demonstrated that the key factor that is decisive to the separation capability of column crystallization is the reflux ratio. The experiments showed that product purities can easily exceed 99.0% over a wide range of feed compositions, 68-94 wt%, reflux ratios, 1.0-4.7, and crystal bed heights, 200-900 mm within a column of 50 cm i.d.

Two-phase flow hydrodynamics in vertical capillaries of circular and square cross sections were experimentally studied, using air as the gas phase and water, ethanol, or an oil mixture as the liquid phase. The capillary hydraulic diameters ranged from 0.9 mm to 3 mm, with the superficial gas and liquid velocities covering a span of 0.008-1 m/s, which is typical of that obtained in monolith reactors. Using a high-speed video camera, four distinct flow regimes were observed within the range at which experiments were conducted: bubbly, slug-bubbly, Taylor, and churn flows. Annular flow was observed at excessively high gas and low liquid flow rates, well beyond those of interest to this study. Based on the definition of a two-class flow regime, the combination of two parameterssthe slip ratio (S) and the ratio of the superficial gas velocity to two-phase superficial velocity (UG/UTP)-was observed to be suitable for determining the transition from homogeneous flow to nonhomogeneous flow. The influence of capillary geometry, capillary hydraulic diameter, and fluid properties on bubble rise velocity (Vb) were investigated and determined to be of little significance. Furthermore, a new and simplified correlation for predicting Vb and, by implication, the gas holdup (∈G) was proposed. Liquid slug lengths were also experimentally studied, using a correlation that was developed to estimate them. Pressure drop experiments were also performed, and the peculiar phenomenon of negative frictional pressure drops was observed at very low liquid velocities. By defining a new dimensionless quantitysthe pressure factor, FE-a flow-regime-dependent method for estimating the total pressure drop in two-phase vertical capillary flows was developed.

利用本文(I)报发展的模型和算法对整个CFB系统的性能和不同氧种的历时变化与操作条件的相互关系进行了分析，特别是揭示了提高流化床再生器反应温度，使两反应器的性能和反应速率更好匹配的显著效果，为进一步开发研究指明了方向。

利用动力学Monte Carlo(KMC)模拟方法计算了苯在Y沸石中扩散的自扩散系数，并考察了3种不同w-w位间跳跃扩散机制下的自扩散系数及其对温度和浓度的依赖关系。实验测量结果表明，苯在Y沸石中的长程运动主要是经SⅡ-W-SⅡ笼间的跳跃，基本不发生w-w之间的跳跃。相应得到的自扩散系数对温度的依赖关系较接近实验值；自扩散系数浓度依赖变化趋势为：先随覆盖量的增加而减小，到覆盖量大于 s位的饱和覆盖量 (每个超笼中4个分子)后，则随覆盖量增加先增后减，但也不会大于零覆盖量时扩散系数值，该情形与考虑 w-w之间跳跃时完全不同。此外，模拟结果表明，使用正确的跳跃机制是 KMC方法能正确模拟客体分子在沸石内扩散行为的关键。