The effect of gas rates , liquid flow - rates , downcomer width , weir height and the addition of surface active agent on the liquid mean residence time , t , effective diffusion coefficient , de , and froth height , hf were studied . results obtained showed that for two systems , the t in the downcomer of ctst plate is 20 - 50 % smaller than that of fl valve plate , and the de is 40 - 70 % smaller than that of fl valve plate 通过对气速、液体流量、降液管宽度、堰高和表面活性剂加入的影响进行分析得出下面结论：在相同的操作条件下，对于两种物系， ctst塔板降液管的液体停留时间比f1浮阀塔板的约小20 50 ，有效扩散系数比f1浮阀塔板的小40 70 ，泡沫高度低110 150mm 。
With the thermodynamic theories and techniques , it is relatively easy to determine the phase equilibrium data with enough accuracy , however there still exist much more difficulties in crystallization kinetics study even for a simple binary system . that is the reason that nucleation and crystal growth rate are generally represented in form of the empirical expressions . the crystallization kinetic is important for crystallizer design , process control and optimization , and it is strongly depended upon the accurate characterization of process information concerning with multiphase flows and the further disclose of its mechanisms with suitable mathematical models 热力学理论和方法已足以获得准确的相平衡关系；然而即使对于简单的二元物系的结晶过程，晶核形成和晶体生长动力学的研究仍面临许多困难，通常采用经验模型表述，而动力学参数的准确性和可靠性是结晶器放大设计、过程控制与优化的关键，因此多相流信息的准确表征、结晶机理的进一步揭示及建立起与之相适应的数学模型有着十分重要的学术研究和实际应用价值。
The development of mass transfer in the system of vapor - liquid - liquid three - phase distillation from trays was introduced , the effects of the hydrodynamic conditions e . g . vapor velocity and ratio of liquid to vapor loading and physical properties of liquid phase , including surface tension , interfacial tension , viscosity or dispersion viscosity , density , relative volatility etc . and the volume ratio of oil to water on mass transfer were discussed systematically , the influence of the second liquid on mass transfer efficiency was also investigated , a gnat deal of viewpoints and suggestions having been put forward in this paper are significant important for optimizing design of distillation tower 摘要介绍了气液液三相精馏塔板传质性能研究的进展情况，讨论了气速、液气比等操作条件，表面张力、界面张力、液体的粘度或分散粘度、密度和相对挥发度等物系性质以及油水体积比等多种参数对传质效率的影响，探讨了第二液相的存在对传质的影响，文中的许多观点获和建议对于优化精馏塔的设计具有重要的指导意义。
Results of calculation indicate that the bubble & dew points may be reduced extremely , but the relative volatility rises slightly and the separation of them is affected hardly by decreasing pressure . and this article puts forward more reasonable modifying suggestions after analyzing numerically in detail the common method of determining the position of sensitive plate in distillation tower and finds out something unsatisfactory about it 计算结果表明,减压可大大降低乙苯?苯乙烯物系的泡、露点,但相对挥发度增加甚微,对其分离的难易程度几乎无影响;对常用求取精馏塔灵敏板位置的方法进行了详尽的数值分析,对其不合理性提出了改进措施。
