Diafiltration by nanofiltration: prediction and optimization

Research output: Contribution to journalArticle

162 Citations (Scopus)

Abstract

A predictive model for the performance of a nanofiltration membrane in separating the components of a dye/salt solution was developed. It is based on the extended Nernst-Planck equation with incorporation of concentration polarization for mixtures of charged ions. Excellent agreement between predicted and experimental rejections of anions and cations was obtained for batch nanofiltration at different ratios of dye/salt assuming that the membrane charge density (Xd) depends on the total concentration of negative changes in the solutions. Prediction for diafiltration experiments was also excellent by allowing for variation in Xd as the salt concentration in the solution changed as a function of time. The model was used to investigate optimization of the processing conditions. The overall diafiltration process operated best in a two-phase mode, in which the dye solution was preconcentrated to the final required dye concentration before diafiltration.

Original languageEnglish
Pages (from-to)1799-1929
Number of pages131
JournalAICHE Journal
Volume44
Issue number8
Publication statusPublished - Aug 1998
Externally publishedYes

Fingerprint

Nanofiltration
Coloring Agents
Dyes
Salts
Nanofiltration membranes
Membranes
Charge density
Anions
Cations
Negative ions
Positive ions
Ions
Polarization
Processing
Experiments

ASJC Scopus subject areas

  • Biotechnology
  • Chemical Engineering(all)
  • Mechanical Engineering
  • Environmental Engineering
  • Polymers and Plastics

Cite this

Diafiltration by nanofiltration : prediction and optimization. / Bowen, W. R.; Mohammad, Abdul Wahab.

In: AICHE Journal, Vol. 44, No. 8, 08.1998, p. 1799-1929.

Research output: Contribution to journalArticle

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