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Received March 19, 2021
Accepted July 20, 2021
articles This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Study on mass transfer and heat transfer in transition zone of short-path distillation separation equipment based on N-dodecanol and N-hexadecanol

College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao 266061, China 1College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China 2Shandong Xinhua Pharmaceutical Company Limited, Zibo 255000, Shandong Province, China
jmzhang@qust.edu.cn
Korean Journal of Chemical Engineering, February 2022, 39(2), 306-315(10), 10.1007/s11814-021-0908-z
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Abstract

Based on the fact that the distance between the heat exchange surfaces has little influence on the separation efficiency in the short-path distillation, a hypothesis that the heat and mass transfer process in the transition region is controlled by heat convection is proposed; the gas-liquid state in the transition zone was calculated by numerical simulation experiment. The results show that the gas-liquid volume fraction and temperature fluctuation in the evaporation and condensation process is unstable, while the gas-liquid volume fraction and temperature fluctuation in the transition zone is stable in the short-path distillation process. It can be concluded that in unsteady thermodynamics, the transition zone is a stable convective heat transfer process that is not affected by the distance between heat transfer surfaces. Thus, under ideal conditions, the continuous extension of the transition region has little effect on the distillation efficiency.

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