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- Title
Mass transfer under distillation of positive, neutral, and negative system in the I.D. 0.3 m column packed with structured packing.
- Authors
Čmelíková, Tereza; Valenz, Lukáš; Mařík, Karel; Rejl, František J.
- Abstract
The distillation of three binary test systems differing in the surface tension gradient along the column, namely: cyclohexane/n-heptane (negative), cyclohexane/toluene (neutral), n-hexane/cyclohexane (positive), has been performed under total reflux in the i.d. 0.3 m distillation column packed with MellapakPlus 452. Y structured packing. Although all constituents are C 6 – C 7 hydrocarbons with close physical properties in the gas phase, the resulting HETP differ by up to 20 %. Further analysis suggests that system negativity causes the approx. 30 % decrease of the effective interfacial area with respect to positive and neutral systems, which behave comparably. Indeed, observation of the distillation on the inclined plate in the IR spectra shows breakage of the negative system liquid films into rivulets, supporting the result. [Display omitted] • HETP, kGa of MellapakPlus 452. Y measured in 0.3 m distillation column. • Significant difference between HETP of negative and neutral/positive systems. • Distillation effective interfacial area evaluated using kG chemisorption correlation. • Liquid film of the negative system breaks into rivulets as conveniently observed in IR spectra.
- Subjects
PACKED towers (Chemical engineering); MASS transfer; DISTILLATION; POSITIVE systems; LIQUID films; TEST systems; SURFACE tension
- Publication
Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers Part A, 2023, Vol 196, p52
- ISSN
0263-8762
- Publication type
Article
- DOI
10.1016/j.cherd.2023.06.007