Microcell for potentiometric pH measurements of supercritical aqueous solutions

Sue, Kiwamu; Ouchi, Fumiaki; Arai, Kunio

doi:10.1016/j.supflu.2006.03.017

Cited by 9 publications

(9 citation statements)

References 22 publications

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“…The flow-through cell and apparatus and general procedure are described in our previous publi-cations. 7,[15][16][17][18] The cell has a Y-type passage, and pressurebalanced hydrogen platinum reference and test electrodes are placed on the left and right sides, respectively. These electrodes were sealed by a packing-type high-pressure CONAX fitting with a Teflon sealant.…”

Section: Methodsmentioning

confidence: 99%

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Determination of Carboxylic Acid Dissociation Constants to 350 °C at 23 MPa by Potentiometric pH Measurements

et al. 2004

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The dissociation constants of aqueous ethanoic, propanoic, butanoic, pentanoic, and hexanoic acids were determined in 0.1 mol·kg-1 NaCl media at temperatures from (19.4 to 350.4) °C and 23 MPa by a flow-through electrochemical cell with a pressure-balanced hydrogen platinum electrode. Temperature dependence of K values shown by each acid were qualitatively similar. The values are consistent with the literature values determined from potentiometry, calorimetry, and electrical conductivity. An empirical density model for the description of the temperature dependence of the equilibrium constants was used to correlate the data.

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Section: Methodsmentioning

confidence: 99%

“…In this work, we focus on pH measurements of aqueous ethanoic, propanoic, butanoic, pentanoic, and hexanoic acids solutions by a recently developed flow-through potentiometric apparatus 7,[15][16][17][18] at temperatures up to 350 °C and an evaluation of the molal dissociation constants as a function of temperature and water density.…”

Section: Introductionmentioning

confidence: 99%

Determination of Carboxylic Acid Dissociation Constants to 350 °C at 23 MPa by Potentiometric pH Measurements

et al. 2004

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“…Sophisticated techniques for the measurement of those properties under high temperature and high pressure conditions were also presented. A micro-cell for potentiometric pH measurements of aqueous solutions in supercritical state has been reported [12]. An apparatus utilizing an optical cell under flow conditions was also developed to measure solubility, salt deposition and Raman spectroscopic studies in aqueous solutions near the critical point [13].…”

Section: Water Under Sub-and Supercritical Conditionsmentioning

confidence: 99%

Conversion of Biomass to Bio-Oil in Sub- and Supercritical Water

Quitain¹,

Chan²,

Yusup³

et al. 2015

Biofuels - Status and Perspective

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“…The flow-through cell and apparatus and general procedure are described in our previous publications [20,21]. The cell has Y-type passage and pressure balanced hydrogen platinum reference and test electrodes are placed on the left and right side, respectively.…”

Section: Apparatusmentioning

confidence: 99%

“…In the 1990s, a flow-through technique with pressure balanced hydrogen platinum electrode was proposed by Lvov et al [19] for the measurement at near critical and supercritical regions. Recently, Sue et al [20,21] improved the apparatus for measuring the potentials more precisely and the pH directly, demonstrated that the apparatus operates successfully in supercritical aqueous solutions at temperatures up to 400 • C, pressures up to 35 MPa and water densities down to 0.17 g cm −3 and further determined dissociation constant of phenol [22] and acetic acid [23] at supercritical conditions.…”

Section: Introductionmentioning

confidence: 99%