The influence of nanoparticles on hydrodynamic characteristics and mass transfer performance in a pulsed liquid-liquid extraction column

Bahmanyar, A ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.cep.2011.08.008
  3. Abstract:
  4. With respect to the influence of nanoparticles on mass transfer characteristics, limited number of studies available in the literature, deal primarily with gas-liquid systems. In this work, mass transfer performance and hydrodynamic characteristics including static and dynamic dispersed phase hold-ups of nanofluids have been investigated for pulsed liquid-liquid extraction column (PLLEC). The nanofluids used were prepared by dispersing SiO2 nanoparticles of 0.01, 0.05 and 0.1 volume percent with two different hydrophobicities in kerosene as base fluid using ultrasonication. UV-vis spectrophotometer was also used for evaluation of the nanofluids stability. The results were compared with conditions of no-nanoparticles in the dispersed phase and in the absence of mass transfer effect (no acetic acid as solute). Different pulsation intensities were maintained for the fixed mass flow rates of dispersed (Qd) and continuous (Qc) phases (with ratio Qc/Qd=1.2) with mass transfer direction being made from the dispersed phase to the continuous one. The results indicate that in the presence of the nanofluids, static and dynamic dispersed phase hold-ups increased by 23-398%, and 23-257%, respectively, while mass transfer performance was enhanced by 4-60%
  5. Keywords:
  6. Dynamic hold-up ; Enhancement factor ; Nanofluids ; Pulsed column ; Static hold-up ; Dispersed phase ; Enhancement factor ; Fixed mass flows ; Gas-liquid systems ; Hold up ; Hydrodynamic characteristics ; Liquid-liquid extraction ; Mass transfer effects ; Mass transfer performance ; Static and dynamic ; Transfer characteristics ; Ultra-sonication ; UV-Vis spectrophotometers ; Acetic acid ; Hydrodynamics ; Liquids ; Mass transfer ; Nanoparticles ; Silicon compounds ; Solvent extraction ; Nanofluidics
  7. Source: Chemical Engineering and Processing: Process Intensification ; Volume 50, Issue 11-12 , 2011 , Pages 1198-1206 ; 02552701 (ISSN)
  8. URL: http://www.sciencedirect.com/science/article/pii/S0255270111001826