The Solubility of Sodium Sulfate and the Reduction of Aqueous Sulfate by Magnetite under Near-Critical Conditions
作者： Dmitri Shvedov , Peter R. Tremaine
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摘要: The solubility of Na2SO4 (s) (thenardite) and the interactions between magnetiteand aqueous near critical point water have been determined in azirconium-alloy flow reactor at temperatures 350°C ≤ t 375°C isobaricpressures 190 p 305 bar. experimental data are describedwell as a function temperature solvent density ρ1 byln x(Na2SO4, aq.) = −10.47 − 27550/T +(4805/T) ln ρ1.The interaction magnetite (aq.) was examined from 250 to370°C molalities saturation composition (s). While no solidreaction products were observed, HS− observed to form above 350°Cby sulfate reduction, product reaction8 Fe3O4(s) + H2O(l)= 12 Fe2O3 NaHS NaOH (aq.).The reduction reaction appears be controlled by surface kinetics, ata level well below equilibrium molality (aq.). Metallic iron reactedwith similar fashion 350°C, yieldhigher
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sci-hub.se 参考文章(20)
Miguel A. Blesa, Alberto E. Regazzoni, Pedro J. Morando, Chemical dissolution of metal oxides ,(1994)
Kenneth S. Pitzer, Activity Coefficients in Electrolyte Solutions ,(2017)
R.H Busey, H.F Holmes, R.E Mesmer, The enthalpy of dilution of aqueous sodium chloride to 673 K using a new heat-flow and liquid-flow microcalorimeter. Excess thermodynamic properties and their pressure coefficients The Journal of Chemical Thermodynamics. ,vol. 16, pp. 343- 372 ,(1984) , 10.1016/0021-9614(84)90174-5
Marek Obšil, Vladimír Majer, Glenn T. Hefter, Vladimír Hynek, Densities and apparent molar volumes of Na2SO4(aq) and K2SO4(aq) at temperatures from 298 K to 573 K and at pressures up to 30 MPa Journal of Chemical & Engineering Data. ,vol. 42, pp. 137- 142 ,(1997) , 10.1021/JE960269R
P. S. Z. Rogers, Kenneth S. Pitzer, High-temperature thermodynamic properties of aqueous sodium sulfate solutions The Journal of Physical Chemistry. ,vol. 85, pp. 2886- 2895 ,(1981) , 10.1021/J150620A008
Vladimír Majer, Jean-Pierre E. Grolier, Glenn T. Hefter, Marek Obšil, Volumetric properties of, and ion-pairing in, aqueous solutions of alkali-metal sulfates under superambient conditions Journal of the Chemical Society, Faraday Transactions. ,vol. 92, pp. 4445- 4451 ,(1996) , 10.1039/FT9969204445
Roberto T. Pabalan, Kenneth S. Pitzer, Thermodynamics of concentrated electrolyte mixtures and the prediction of mineral solubilities to high temperatures for mixtures in the system Na-K-Mg-Cl-SO4-OH-H2O Geochimica et Cosmochimica Acta. ,vol. 51, pp. 2429- 2443 ,(1987) , 10.1016/0016-7037(87)90295-X
Kenneth S. Pitzer, John S. Murdzek, Thermodynamics of aqueous sodium sulfate Journal of Solution Chemistry. ,vol. 11, pp. 409- 413 ,(1982) , 10.1007/BF00649039
Gleb S. Pokrovski, Jacques Schott, Alexandre S. Sergeyev, Experimental determination of the stability constants of NaSO4− and NaB (OH)40 in hydrothermal solutions using a new high-temperature sodium-selective glass electrode — Implications for boron isotopic fractionation Chemical Geology. ,vol. 124, pp. 253- 265 ,(1995) , 10.1016/0009-2541(95)00057-S
Fred J. Armellini, Jefferson W. Tester, Solubility of sodium chloride and sulfate in sub- and supercritical water vapor from 450–550°C and 100–250 bar Fluid Phase Equilibria. ,vol. 84, pp. 123- 142 ,(1993) , 10.1016/0378-3812(93)85120-B