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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

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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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Abbreviations

C r=ξ 1−ξ :

the relative velocity of gas molecules

ξ *,ξ *1 :

the corresponding velocities of two molecules with velocities ξ and ξ1 when they collide with each other

σ :

the molecular pair collision cross section

F:

the external forces acting on gas molecules

m:

the mass of gas molecules

Ω:

the solid angle

ε :

energy parameters

rij :

the distance between atoms i and j

rcut :

the cut-off radius

A, B:

represent different atom types

Fc :

the conservative force computed via the usual inter-particle interactions

Ff :

a frictional drag or viscous damping term proportional to the particle’s velocity

Fr :

a force due to solvent atoms at a temperature T randomly bumping into the particle

damp:

the damping factor specified by the user

υ :

the relative velocity of particles

Kb :

the Boltzmann constant

T:

the desired temperature

δ t :

the timestep size

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Acknowledgement

This work was supported by a grant from the Shandong Province Taishan Scholar engineering under special funding Foundations, Shandong Provincial Natural Science Foundation (ZR2020MB122), and the Tackling Key Program of Science and Technology in Shandong Province (No. 2019GSF109009; No. 2017GGX40113).

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Authors and Affiliations

  1. College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao, 266061, China

    Zhenya Duan, Haodong Zhang, Bin Liu & Zhiwei Sun

  2. College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China

    Junmei Zhang

  3. Shandong Xinhua Pharmaceutical Company Limited, Zibo, Shandong Province, 255000, China

    Longlong Lin

Authors
  1. Zhenya Duan
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  2. Haodong Zhang
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  3. Bin Liu
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  4. Zhiwei Sun
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  5. Junmei Zhang
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  6. Longlong Lin
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Correspondence to Junmei Zhang.

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Duan, Z., Zhang, H., Liu, B. et al. Study on mass transfer and heat transfer in transition zone of short-path distillation separation equipment based on N-dodecanol and N-hexadecanol. Korean J. Chem. Eng. 39, 306–315 (2022). https://doi.org/10.1007/s11814-021-0908-z

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  • DOI: https://doi.org/10.1007/s11814-021-0908-z

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