Model for excess mass-transfer resistance of contaminated liquid-liquid systems

Molaei Dehkordi, A ; Sharif University of Technology | 2007

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  1. Type of Document: Article
  2. DOI: 10.1021/ie061032j
  3. Publisher: 2007
  4. Abstract:
  5. The prediction of mass-transfer rates into and from moving drops in the liquid-liquid systems has usually used the well-known Whitman two-film theory approach. According to the latter, the total resistance to mass transfer resides on each side of the interface and is described by the individual film mass-transfer coefficients for the continuous and dispersed phases in the absence of surface-active agents (contaminants). In the present work, the same approach has been used to model the excess mass-transfer resistance exerted by surface-active agents in the continuous phase. To achieve this goal, an experimental investigation has been conducted on the mass transfer into and from single drops for the chemical test system, n-butanol-succinic acid-water, recommended by the European Federation of Chemical Engineering (EFCE) in the presence and absence of the anionic surfactant, sodium dodecyl sulfate (SDS). The influence of the latter on the drop size, drop contact time, extraction fraction, viscosity of the continuous phase, and interfacial tension as well as the overall mass-transfer coefficients for both mass-transfer directions has been investigated. On the basis of the experimental results obtained for both mass-transfer directions, the excess mass-transfer resistance exerted by the surfactant has been correlated in terms of drop Reynolds numbers for the clean and contaminated chemical systems. © 2007 American Chemical Society
  6. Keywords:
  7. Reynolds number ; Surface active agents ; Mass-transfer coefficients ; Sodium dodecyl sulfate (SDS) ; Whitman two-film theory ; Mass transfer ; Dispersions ; Interfaces (materials)
  8. Source: Industrial and Engineering Chemistry Research ; Volume 46, Issue 5 , 2007 , Pages 1563-1571 ; 08885885 (ISSN)
  9. URL: https://pubs.acs.org/doi/abs/10.1021/ie061032j