Study on the Mechanism of the Phase Inversion Phenomenon in a Suspension Polymerization Reaction with a Combined-type Tomography Measurement System

利用层析成像测量和实时快速图像处理两种可视化方法，研究了一种常用的聚合反应釜液-液体系的动态分散行为。首先，利用层析成像测量方法，测量了液液体系(水-油(5%，10%))从初始状态到最终状态的动态行为，在这种状态下，油相在水层中充分分散，分散时间与操作条件，如搅拌桨转速和分散相浓度，随后，使用层析成像测量，可以从…中的水中掌握相反转现象通过突然改变叶轮高度，将更多的油(30vol%)转化为水中油。此外，通过动态改变叶轮转速，还可以掌握从油中含水(50vol%)到水中含油的反相现象。同时，利用实时、快速的图像处理系统，研究了单体油滴在无聚合反应的情况下的动态分散过程。随后，通过对实际悬浮聚合过程中液滴直径分布的动态测量，获得了聚合反应过程中平均液滴直径的动态变化数据，因此，需要继续研究液-液分散状态的动态行为，以便通过更准确的测量来阐明悬浮聚合反应中相转化现象的机理。较少

The dynamic dispersion behavior of liquid-liquid systems in a type of stirred vessel that is frequently used as a polymerization reactor was studied using two visualization methods: tomography measurements and a real-time, fast image processing system.Firstly, using tomography measurements, the dynamic behavior was measured from the initial state, in which the two phases of a liquid-liquid system (water-oil (5, 10%)) exist in separate layers, to the final state, in which the oil phase is sufficiently dispersed in the water layer The relation between the dispersion time and the operating conditions, such as the impeller rotational speed and the concentration of the dispersion phase, was obtained based on the results measured, and the process, in which the oil phase is divided and dispersed throughout the vessel, was understood in relation to the bulk flow in the vessel.Subsequently, using the tomography measurements, it was possible to grasp the phase inversion phenomenon, from Water in … More Oil (30vol%) to Oil in Water, by suddenly varying the impeller height. Further, it was also possible to grasp the phase inversion phenomenon, from Water in Oil (50vol%) to Oil in Water, by dynamically varying the impeller rotational speed. Accordingly, it was found that the Water in Oil and Oil in Water states replace each other continuously and reversibly up to a certain point, but that the replacement becomes irreversible after that point.In parallel, using a real-time, fast image processing system, the dynamic dispersion process of monomer oil droplets was investigated, firstly, without a polymerization reaction. Subsequently, data on the dynamic change of mean droplet diameter was obtained during a polymerization reaction by dynamically measuring the droplet diameter distribution in an actual suspension polymerization field.Thus, it is desired to continue to study the dynamic behavior of liquid-liquid dispersion states in order to clarify the mechanism of the phase inversion phenomenon during a suspension polymerization reaction by making more accurate measurements. Less