Density, Viscosity, and Thermal Conductivity of Electronic Grade Phosphoric Acid

Jiang, Xiaobin; Zhao, Yingying; Hou, Baohong; Zhang, Meijing; Bao, Ying

doi:10.1021/je100938j

Cited by 22 publications

(22 citation statements)

References 10 publications

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“…17 Downloaded on 2018-08-28 to IP Table I acid solution should give a lower viscosity to the system, resulting in a higher mobility of all particles within the system. 37 In addition, the hydrolysis of higher polymeric phosphoric acid will also lower the viscosity of the overall phosphoric acid. In the presence of the polymer, the present measurement showed, however, that further addition of water into the gas stream from P H 2 O 0.17 to 0.30 atm did not seem to affect the value of D. Figure 6b compiles the value of D as a function of temperature under a constant water partial pressure of 0.17 atm.…”

Section: Modeling Results For Acid Migration and Back Diffusion-in Or-mentioning

confidence: 99%

Determination of Anion Transference Number and Phosphoric Acid Diffusion Coefficient in High Temperature Polymer Electrolyte Membranes

Becker

Reimer

Aili

et al. 2018

J. Electrochem. Soc.

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The passage of an electrical current through phosphoric acid doped polymer membranes involves parasitic migration of the acid, which imposes a critical issue for long-term operation of the high temperature polymer electrolyte membranes fuel cell (HT-PEMFC). To elucidate the phenomenon, a three-layered membrane is constructed with embedded micro reference electrodes to measure phosphoric acid redistribution in a polybenzimidazole based membrane. Under a constant load, a concentration gradient develops due to the acid migration, which drives the back diffusion of the acid and eventually reaches a steady state between migration and diffusion. The acid gradient is measured as a difference in local ohmic resistances of the anode-and cathode-layer membranes by electrochemical impedance spectroscopy. The phosphoric acid diffusion coefficient through the acid doped membrane is about 10 −11 m 2 s −1 , at least one order of magnitude lower than that of aqueous phosphoric acid solutions. The anion (H 2 PO 4 − ) transference number is found to range up to 4% depending on current density, temperature and atmospheric humidity of the cell, implying that careful control of the operating parameters is needed in order to suppress the vehicular proton conduction as a degradation mitigation strategy.

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Section: Modeling Results For Acid Migration and Back Diffusion-in Or-mentioning

confidence: 99%

Determination of Anion Transference Number and Phosphoric Acid Diffusion Coefficient in High Temperature Polymer Electrolyte Membranes

Becker

Reimer

Aili

et al. 2018

J. Electrochem. Soc.

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“…The experimental apparatus had been shown in author's previous work . The measured data were used to verify the model simulative results.…”

Section: Resultsmentioning

confidence: 99%

“…With the data reported by Jiang et al , the following equations were cited to calculate the density ρ with known mass fraction of H 3 PO 4 and temperature:

\begin{matrix} true \\ right prefixln (() ρ / g \cdot {cm}^{- 3}) & = & left (() - 4.93 \times 10^{- 5} ((T - 273.1 5) / normalK) + 0.6962) (100 w) \\ left - 0.0599 \exp (5.2 \times 10^{- 3} (T - 273.1 5) / normalK)) \end{matrix}

…”

Section: The Effective Thermal Conductivity Of the Whole Porous Crystmentioning

confidence: 99%

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Fractal slice model analysis for effective thermal conductivity and temperature distribution of porous crystal layer via layer crystallization

Jiang

Wang

2013

Crystal Research and Technology

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A fractal slice model was established based on the reported model to predict the effective thermal conductivity of a porous crystal layer via layer crystallization. The temperature distribution of the crystal layer was obtained by the fractal slice method. The simulation results agreed with the experimental data better than the other theoretical models. The results were helpful to enhance the thermal transport by mitigating the thermal resistance effectively.

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“…However, increasing the temperature can obviously decrease the viscosity of organic phase and thus speed up the two‐phase separation. All the subsequent experiments were completed at 313.15 K …”

Section: Resultsmentioning

confidence: 99%

Wet process phosphoric acid purification by solvent extraction using N‐octanol and tributylphosphate mixtures

2013

J of Chemical Tech & Biotech

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BACKGROUND: Solvent extraction using organic extractants is an important technology for purifying wet process phosphoric acid. The purification of the wet process phosphoric acid by liquid-liquid extraction using solvent mixtures of N-octanol and tributylphosphate has been investigated. RESULTS:The purification process comprised extraction, scrubbing and stripping operations. The extraction conditions, i.e. shaking time, temperature, composition of solvent mixtures and P 2 O 5 concentration for purification of the wet process phosphoric acid were studied. The phase diagram of the pseudo-ternary system H 3 PO 4 -H 2 O-solvent mixtures at 313.15 K was determined. The McCabe-Thiele diagram showed that three counter-current stages achieved about 91 wt% P 2 O 5 extraction at 313.15 K. Scrubbing and stripping operations using pure phosphoric acid with 10 wt% P 2 O 5 and doubly distilled water, respectively, were studied. CONCLUSIONS: The phosphoric acid finally produced was found to be high grade which met the special requirements of the user. Optimization of the extraction conditions and system was capable of providing academic and technical foundations to realize industrial production.

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Density, Viscosity, and Thermal Conductivity of Electronic Grade Phosphoric Acid

Cited by 22 publications

References 10 publications

Determination of Anion Transference Number and Phosphoric Acid Diffusion Coefficient in High Temperature Polymer Electrolyte Membranes

Determination of Anion Transference Number and Phosphoric Acid Diffusion Coefficient in High Temperature Polymer Electrolyte Membranes

Fractal slice model analysis for effective thermal conductivity and temperature distribution of porous crystal layer via layer crystallization

Wet process phosphoric acid purification by solvent extraction using N‐octanol and tributylphosphate mixtures

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