Flow-through electrochemical cell for pH measurement of organic acid aqueous solutions at subcritical and supercritical conditions

Kiwamu Sue, Kenji Murata, Yuuki Matsuura, Masayuki Tsukagoshi, Tadafumi Adschiri, Kunio Arai

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

The pH of aqueous phenol solutions at subcritical and supercritical conditions was measured for the first time at temperatures from 296.4 to 673.4K and pressures from 29.8 to 34.9MPa by using a flow-through electrochemical cell. From the results, we determined the equilibrium constant for the dissociation reaction of phenol (KPhOH). The dissociation constants of phenol varied from 1.0×10-12mol/kg at 673.4K and 30.2MPa to 7.9×10-10mol/kg at 473.1K and 29.9MPa. The semi-empirical model for correlation of the equilibrium constant in subcritical and supercritical water was applied to correlate the data and to discuss the temperature, pressure and density effects on the phenol dissociation constant.

Original languageEnglish
Pages (from-to)1097-1106
Number of pages10
JournalFluid Phase Equilibria
Volume194
Issue number197
DOIs
Publication statusPublished - 2002 Mar 30

Keywords

  • Data
  • Dissociation constant
  • Experimental method
  • Flow-through electrochemical cell
  • Phenol
  • Supercritical water
  • pH measurement

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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