DSC study op polymorphism of Na4P2O7

Лазарев, В. Б.; Sokolova, I. D.; Sharpataya, G. A.

doi:10.1016/0040-6031(85)85876-7

Cited by 3 publications

(7 citation statements)

References 3 publications

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“…Grantscharova et al [50] used DSC to determine the heat capacity of NaPO 3 between 468 and 675 K, but their measurements were much higher than those reported by Ashcroft et al [48]. Considering the above-reported heat capacity data, the data reported by Andon et al [47], Ashcroft et al [48] and Lazarev et al [49] were considered in the present work to optimize the heat capacities of Na 4 P 2 O 7 and NaPO 3 .…”

Section: Systemmentioning

confidence: 92%

“…Andon et al [47] determined the heat capacities of NaPO 3 , Na 5 P 3 O 10 , Na 4 P 2 O 7 and Na 3 PO 4 using adiabatic calorimetry within the temperature range of 10 to 320 K. Ashcroft et al [48] measured the heat capacities of Na 4 P 2 O 7 and NaPO 3 from 298 to 620 K and determined the low-temperature transition enthalpy of Na 4 P 2 O 7 . Lazarev et al [49] used DSC to measure the heat capacity of Na 4 P 2 O 7 in the temperature range from 300 to 1000 K and measured the low-temperature enthalpy of transition of the Na 4 P 2 O 7 . Grantscharova et al [50] used DSC to determine the heat capacity of NaPO 3 between 468 and 675 K, but their measurements were much higher than those reported by Ashcroft et al [48].…”

Section: Systemmentioning

confidence: 99%

“…The Gibbs energy functions for the components P 2 O 5 and Na 2 O were sourced from the works of Jung et al [65] and Wu et al [66], respectively. Initially, the heat capacities of polymorphic forms of Na 4 P 2 O 7 and NaPO 3 were determined by fitting experimental data from Andon et al [47], Ashcroft et al [48] and Lazarev et al [49], which were treated as identical within this study. Subsequently, the formation enthalpies of the four intermediate phases were optimized using experimental data on formation enthalpies from elements [40][41][42][43][44][45][46].…”

Section: P 2 O 5 -Na 2 O Systemmentioning

confidence: 99%

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Thermodynamic Assessment of the P2O5-Na2O and P2O5-MgO Systems

Ye,

Li,

Yang

et al. 2024

Materials

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Knowledge about the thermodynamic equilibria of the P2O5-Na2O and P2O5-MgO systems is very important for controlling the phosphorus content of steel materials in the process of steelmaking dephosphorization. The phase equilibrium and thermodynamic data of the P2O5-Na2O and P2O5-MgO systems were critically evaluated and re-assessed by the CALPHAD (CAlculation of PHAse Diagram) approach. The liquid phase was described by the ionic two-sublattice model for the first time with the formulas (Na+1)P(O−2, PO3−1, PO4−3, PO5/2)Q and (Mg+2)P(O−2, PO3−1, PO4−3, PO5/2)Q, respectively, and the selection of the species constituting the liquid phase was based on the structure of the phosphate melts. A new and improved self-consistent set of thermodynamic parameters for the P2O5-Na2O and P2O5-MgO systems was finally obtained, and the calculated phase diagram and thermodynamic properties exhibited excellent agreement with the experimental data. The difference in the phase composition of invariant reactions from the experimentally determined values reported in the literature is less than 0.9 mol.%. The present thermodynamic modeling contributes to constructing a multicomponent oxide thermodynamic database in the process of steelmaking dephosphorization.

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Section: Systemmentioning

confidence: 92%

Section: Systemmentioning

confidence: 99%

Section: P 2 O 5 -Na 2 O Systemmentioning

confidence: 99%

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Thermodynamic Assessment of the P2O5-Na2O and P2O5-MgO Systems

Ye,

Li,

Yang

et al. 2024

Materials

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“…C p (H-P 2 O 5 ) is taken from Jung and Hudon, in which the expression was derived based on the data from JANAF, but restrained to a maximum of 20 J mol –1 K –1 above the heat capacity of P 2 O 5 (s) at its melting point. The data from JANAF is based on experimental data from Andon et al up to 51 °C, and graphical extrapolation above this temperature. c Was fitted using data from Ashcroft et al d Was fitted using data from several references. − e Adopted from Levina (reference given as specified by Xie et al). f Adopted from Lazarev et al g Adopted from Kurian and Tamhankar (reference given as specified by Xie et al). …”

Section: Fundamental High-temperature Phosphorus Chemistrymentioning

confidence: 99%

“…325−327 e Adopted from Levina 328 (reference given as specified by Xie et al 104 ). f Adopted from Lazarev et al 326 g Adopted from Kurian and Tamhankar 329 (reference given as specified by Xie et al 104 ). Sublimation and vaporization is the transfer of molecules from solid and liquid phase to gas phase, respectively.…”

Section: Magnesium (Mg)mentioning

confidence: 99%

Review of Phosphorus Chemistry in the Thermal Conversion of Biomass: Progress and Perspectives

et al. 2023

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Phosphorus is vital for all life, which means that phosphorus is present in all biomass to some extent. Some types of biomass, such as certain agricultural residues, animal biomass, and sewage sludge, contain high levels of phosphorus. In thermal conversion of biomass, high levels of phosphorus can cause various operational problems. Extensive work has been carried out to understand the phosphorus chemistry taking place at higher temperatures. However, until now, knowledge about transformation chemistry and fate of phosphorus during thermal conversion of biomass was not easily accessible in one place. In this work, the outcome of an extensive literature review has been summarized. First, an introduction to the role of phosphorus in biomass, and in what forms it may be present, is given. Different analytical techniques relevant for characterization of phosphorus in biomass, biomass char, and biomass ash are described. A classification of phosphorus-rich biomass is proposed, and the potential of different phosphorus-rich biomass types is presented. To provide a common basis for the field of high-temperature phosphorus chemistry, fundamental chemistry relevant for thermal conversion of biomass is first discussed. This includes the gas phase chemistry and reaction pathways of light phosphorus species, pyrolysis, and combustion of organophosphorus compounds, and solid, liquid, and gaseous interactions with other ash-forming elements. Thereafter, an in-depth review of phosphorus transformations in biomass, including decomposition of organic phosphorus, ash transformations in the condensed phase, release to the gas phase, and formation of particulate matter in the flue gas follows. Finally, the review covers research focusing on phosphorus in different application aspects, such as the use of phosphorus as an additive to mitigate operational problems related to slag and deposit formation, the behavior of phosphorus in fluidized bed technologies, corrosion, and the deactivation of SCR catalysts.

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