A Process for Solidifying Sodium Nitrate Waste in Polyethylene

Structure determination of sodium nitrate near the order-disorder phase transition

Journal de Physique ◽

10.1051/jphys:019840045080131700 ◽

1984 ◽

Vol 45 (8) ◽

pp. 1317-1327 ◽

Cited By ~ 15

Author(s):

J. Lefebvre ◽

R. Fouret ◽

C.M.E. Zeyen

Keyword(s):

Phase Transition ◽

Sodium Nitrate ◽

Structure Determination ◽

Disorder Phase Transition

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Vapor pressures of aqueous solutions of (silver, thallium, sodium) nitrate at 98.5.degree.C

Journal of Chemical & Engineering Data ◽

10.1021/je60087a020 ◽

1980 ◽

Vol 25 (4) ◽

pp. 331-332 ◽

Cited By ~ 5

Author(s):

Marie Christine Abraham ◽

Maurice Abraham ◽

James Sangster

Keyword(s):

Aqueous Solutions ◽

Sodium Nitrate ◽

Vapor Pressures

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Demonstration of Phase Change Thermal Energy Storage in Zinc Oxide Microencapsulated Sodium Nitrate

Applied Sciences ◽

10.3390/app11136234 ◽

2021 ◽

Vol 11 (13) ◽

pp. 6234

Author(s):

Ciprian Neagoe ◽

Ioan Albert Tudor ◽

Cristina Florentina Ciobota ◽

Cristian Bogdanescu ◽

Paul Stanciu ◽

...

Keyword(s):

Zinc Oxide ◽

Thermal Properties ◽

High Temperature ◽

Energy Storage ◽

Phase Change ◽

Thermal Energy ◽

Sodium Nitrate ◽

Thermal Energy Storage ◽

Metal Corrosion ◽

Scanning Calorimetry

Microencapsulation of sodium nitrate (NaNO3) as phase change material for high temperature thermal energy storage aims to reduce costs related to metal corrosion in storage tanks. The goal of this work was to test in a prototype thermal energy storage tank (16.7 L internal volume) the thermal properties of NaNO3 microencapsulated in zinc oxide shells, and estimate the potential of NaNO3–ZnO microcapsules for thermal storage applications. A fast and scalable microencapsulation procedure was developed, a flow calorimetry method was adapted, and a template document created to perform tank thermal transfer simulation by the finite element method (FEM) was set in Microsoft Excel. Differential scanning calorimetry (DSC) and transient plane source (TPS) methods were used to measure, in small samples, the temperature dependency of melting/solidification heat, specific heat, and thermal conductivity of the NaNO3–ZnO microcapsules. Scanning electron microscopy (SEM) and chemical analysis demonstrated the stability of microcapsules over multiple tank charge–discharge cycles. The energy stored as latent heat is available for a temperature interval from 303 to 285 °C, corresponding to onset–offset for NaNO3 solidification. Charge–self-discharge experiments on the pilot tank showed that the amount of thermal energy stored in this interval largely corresponds to the NaNO3 content of the microcapsules; the high temperature energy density of microcapsules is estimated in the range from 145 to 179 MJ/m3. Comparison between real tank experiments and FEM simulations demonstrated that DSC and TPS laboratory measurements on microcapsule thermal properties may reliably be used to design applications for thermal energy storage.

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Thermoelectric Studies of Silver Nitrate in Sodium Nitrate – Potassium Nitrate Eutectic Melt

Canadian Journal of Chemistry ◽

10.1139/v71-333 ◽

1971 ◽

Vol 49 (12) ◽

pp. 2044-2047

Author(s):

L. G. Boxall ◽

K. E. Johnson

Keyword(s):

Seebeck Coefficient ◽

Silver Nitrate ◽

Mole Fraction ◽

Sodium Nitrate ◽

Nitrate Concentration ◽

Potassium Nitrate ◽

Silver Nitrate Concentration ◽

Eutectic Melt

The Seebeck coefficient, εT, of the thermocell Ag(T)/AgNO3 in NaNO3 − KNO3/Ag (T + ΔT) was measured as a function of silver nitrate concentration and temperature. Extrapolation of the results to unit mole fraction, N, of AgNO3 gave the value εT0 = − 277.5 − 0.136T °C (µV deg−1).For several mixed melts of AgNO3 and an alkali nitrate the function [Formula: see text] was calculated and shown to be linear in N. P was extrapolated to finite values for the pure alkali nitrates.

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The Isotope Effect for Electromigration of Sodium Ions in Molten Sodium Nitrate

Zeitschrift für Naturforschung A ◽

10.1515/zna-1972-0215 ◽

1972 ◽

Vol 27 (2) ◽

pp. 288-293

Author(s):

Nobufusa Saito ◽

Katsumi Hirano ◽

Kohei Okuyama ◽

Isao Okada

Keyword(s):

Melting Point ◽

Isotope Effect ◽

Sodium Nitrate ◽

Mass Effect ◽

Relative Difference ◽

Internal Mass ◽

Sodium Ions ◽

Molten Sodium

AbstractThe relative difference (Δb/b) between the internal electromigration mobilities of 22Na and 24Na in molten NaNO3 has been measured in the range 340 - 515 °C. The internal mass effect, μint= (Δb/b)/(Δm/m) is - 0.056 at 340 °C (melting point 308 °C), - 0.079 at 435 °C and - 0.068 at 515 °C. The errors in μint are ±0.002.

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