Transport characteristics of neutralization dialysis and desalination of tap water

Manabu Igawa*, Kentaro Mikami, Hiroshi Okochi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


In neutralization dialysis, the salt solution is desalinated continuously. The cations in desalination compartment are exchanged with protons in the acid compartment across a cation-exchange membrane and the anions are exchanged with hydroxide ions in the base compartment across an anion-exchange membrane. A simple index (C/J), where C is the source phase concentration (mol cm-3) and J is the flux (mol cm-2 min-1), was proposed for the estimation of the desalination properties in neutralization dialysis. The index was based on the concepts of the ion-exchange reaction rate at the membrane interface and was related to the permeation constant in the source-phase boundary layer at the membrane interface, Pa (cm min-1), as C/J = 1/(k1·Cex) + 1/Pa, where k1 is the rate constant of ion-exchange reaction (mol-1 cm4 min-1) and Cex is the ion exchange capacity of the membrane (mol cm-3). The desalination efficiency increased with the decrease of the desalination compartment thickness and the decrease of the linear velocity, which can be estimated well by using the index. Tap water was desalinated by neutralization dialysis and pure water was obtained at the outlet of the desalination cell.

Original languageEnglish
Pages (from-to)437-441
Number of pages5
JournalBulletin of the Chemical Society of Japan
Issue number2
Publication statusPublished - 2003
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)


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