Using membrane contactors for fruit juice concentration

V. D. Alves, B. Koroknai, K. Bélafi-Bakó, I. M. Coelhoso

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Osmotic evaporation is a membrane process that has fascinating advantages over conventional processes for the production of fruit juice concentrates since it has the ability to concentrate solutes to very high levels with minimal thermal or mechanical damage. Our purpose was to compare and analyse the results obtained in the concentration of a sucrose solution used as model juice. Two different membrane contractors with different specific areas an number and dimensions of fibres/tubes were used. The hydrodynamic conditions that maximize the water flux were previously determined by using a series resistance model. For a determined range of Reynolds number, the boundary layer mass transfer resistances can be neglected and there is only the contribution of the membrane resistance. The concentration of a sucrose solution from 12° Brix to 60° Brix, used as a model fruit juice, was carried out. The water flux decreased due to the progressive reduction of the driving force. The overall mass transfer coefficient, Kp, remained constant throughout the experiment, except for one of the contactors used where there was a reduction due to the concentration polarization caused by the increase of the sucrose solution's viscosity.

Original languageEnglish
Pages (from-to)263-270
Number of pages8
JournalDesalination
Volume162
Issue number1-3
DOIs
Publication statusPublished - Mar 10 2004

Fingerprint

Fruit juices
Sugar (sucrose)
sucrose
Sucrose
fruit
membrane
Membranes
mass transfer
Mass transfer
Fluxes
Water
Reynolds number
Contractors
solute
Boundary layers
Evaporation
viscosity
Hydrodynamics
polarization
evaporation

Keywords

  • Fruit juice concentration
  • Membrane contactors
  • Osmotic evaporation

ASJC Scopus subject areas

  • Filtration and Separation

Cite this

Using membrane contactors for fruit juice concentration. / Alves, V. D.; Koroknai, B.; Bélafi-Bakó, K.; Coelhoso, I. M.

In: Desalination, Vol. 162, No. 1-3, 10.03.2004, p. 263-270.

Research output: Contribution to journalArticle

Alves, V. D. ; Koroknai, B. ; Bélafi-Bakó, K. ; Coelhoso, I. M. / Using membrane contactors for fruit juice concentration. In: Desalination. 2004 ; Vol. 162, No. 1-3. pp. 263-270.
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