Study on micromixing measurement in magnetic stirred reactor

Author: 孟睿; 孙怀宇

Source: 磁力搅拌反应器中微观混合测量的研究

Abstract: 为了研究磁力搅拌器中微观混合的作用及其对化学反应的影响，采用碘化物-碘酸盐体系的平行-竞争反应系统，通过测量溶液吸光度计算离集指数，分析不同条件下的微观混合过程。实验结果表明：提高磁力搅拌器电机转速能够有效促进微观混合；粘度较大的液体不利于微观混合的进行；在加料过程中，将加料位置设置为烧杯中心时效果更佳；当加料的摩尔流速相同时，较低浓度的溶液更有利于微观混合过程的进行。研究结果为优化磁力搅拌器中的微观混合条件提供了参考依据。

【Abstract】Microscopic mixing is the mixing at the molecular scale of fluid, which has an important influence on the chemical reaction. In order to study the progress of micro-mixing in a magnetic stirrer commonly used in chemical reactions, the parallel-competing reaction of iodide-iodate system was used to study the micro-mixing in it. The segregation index was calculated by measuring the absorbance of the solution, and the microscopic mixing under different conditions was analyzed. The study found that increasing the motor speed of magnetic stirring is beneficial to the micro-mixing, and the increase of the viscosity is not conducive to the micro-mixing. Micromixing is better with additions in the center of the beaker than with additions away from the center. At the same molar flow rate of the feed, the lower concentration of the feed facilitates microscopic mixing. The study yielded favorable conditions for micro-mixing in the reactor.

【Key words】microscopic mixing; magnetic stirrer;

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