Effectiveness and mechanism of sodium phytate as a green inhibitor for the dust deflagration of lysine sulfate

Zhang, Ying; Zhang, Beini; Chen, Yue; Yuan, Bihe; Zhang, Wei; Shang, Shuo

doi:10.1016/j.psep.2021.01.001

Cited by 18 publications

(11 citation statements)

References 51 publications

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“…Suggested decomposition mechanism of Na-phytate in an inert atmosphere. The indicated temperature ranges represent typical ranges observed in this work and the literature − and are expected to vary with experimental conditions such as the heating rate.…”

Section: Resultsmentioning

confidence: 71%

“…However, based on the results in this work, it is reasonable to argue that carbonization is taking place at lower temperatures and that P, which has not formed stable phosphates with Ca and/or Mg, is being released to the gas phase above 600 °C. In another study, a Na-phytate with an unspecified ratio of Na/phytate units was heated to 800 °C and the released gases were analyzed using FTIR spectroscopy . No comments to the decomposition mechanism were made apart from that H 2 O, CO 2 , and CO containing compounds were the major species released based on the FTIR result.…”

Section: Resultsmentioning

confidence: 99%

“…The thermal decomposition of phytic acid and different phytates has been investigated in several studies using thermal gravimetric analysis (TGA). − In several cases, the purpose was to investigate the potential of using phytic acid ,,, and different phytates − as flame retardant additives. Most of these studies are limited to a maximum temperature of 800 °C, with only a single study reaching 1000 °C .…”

Section: Introductionmentioning

confidence: 99%

“…But gas analysis and/or characterization of the residues to support the proposed mechanisms are missing. Most of the studies were conducted in air, − but some also using N 2 . ,− , However, in combustion and gasification processes, the concentration of other gas species, such as CO 2 and H 2 O, is often considerable and will participate in reactions with the fuel. In contrast to previous studies, the motivation of this work is to study the release of P under pyrolysis, combustion and gasification conditions to shed light on the release mechanism and the key factors that control the release using phytate as a model compound.…”

Section: Introductionmentioning

confidence: 99%

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Release of P from Pyrolysis, Combustion, and Gasification of Biomass—A Model Compound Study

et al. 2021

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Phosphorus-rich biomass can cause operational problems in combustion units. Na-phytate, a model compound used to simulate phosphorus in biomass, was studied in a laboratory-scale reactor under temperature and gas atmosphere conditions relevant for pyrolysis, combustion, and gasification in fixed bed or fluidized bed reactors to understand the P and Na release behavior. Solid residues from Na-phytate thermal conversion were analyzed using ICP with optical emission spectrometry in order to quantify the P and Na release. The release mechanism was evaluated based on FTIR spectroscopy analysis of the residues, measurement of the flue gas CO/CO2 concentration, characterization of flue gas particles using SEM with EDS, and thermodynamic equilibrium calculations. Na-phytate decomposed in several steps under a nitrogen atmosphere, starting with condensation of the phosphate OH groups, followed by carbonization in the temperature range 300–420 °C. In the carbonization process, the phosphate units detached from the carbon structure and formed cyclic NaPO3. Above 800 °C, the C in the char reacted with the melted NaPO3 to form CO and gaseous elemental P. When the char produced from flash pyrolysis of Na-phytate at 800 °C for 10 min was exposed to 1% O2, 10% CO2, or 10% H2O (in N2), the release of Na and P to the gas phase in the temperature range 800–1000 °C was around 0–7%. However, the release of P in an inert atmosphere, with a holding time of 2 h or until full char conversion had been achieved, increased from around 4% at 800 °C to almost 30% at 1000 °C. The results indicated that carbothermic reduction reaction is responsible for the release of P and that NaPO3 vaporization is not the dominating mechanism for P and Na release at temperatures below 1000 °C. A small amount of P was released in the O2, CO2, and H2O containing gases because these gas species consumed the char and thereby inhibited the release of P.

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Section: Resultsmentioning

confidence: 71%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Release of P from Pyrolysis, Combustion, and Gasification of Biomass—A Model Compound Study

et al. 2021

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“…The thermal stability of PECs with different PEI:SPA ratios as well as PEI and SPA alone was investigated, and the results are presented in Figure 7, with the thermogravimetric analysis (TG) and the derivative thermogravimetric analysis (DTG), and Table 3. PEI thermally decomposes in one step with a maximum decomposition rate at 290 • C and no residue at 800 • C. SPA is more thermally stable, with 76% residual mass at 800 • C. Five percent decomposition happens early (138 • C) for SPA, probably due its strong water absorption properties [58]. SPA decomposes in two steps around 260 • C and 320 • C. When studying PECs with different PEI:SPA ratios, it is worth noting that residual mass increases with the percentage of SPA in the complex.…”

Section: Thermal Stabilitymentioning

confidence: 99%

Innovative Polyelectrolyte Treatment to Flame-Retard Wood

et al. 2021

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Fire protection has been a major challenge in wood construction for many years, mainly due to the high flame spread risk associated with wood flooring. Wood fire-retardancy is framed by two main axes: coating and bulk impregnation. There is a growing need for economically and environmentally friendly alternatives. The study of polyelectrolyte complexes (PECs) for wood substrates is in its infancy, but PECs’ versatility and eco-friendly character are already recognized for fabric fire-retardancy fabrics. In this study, a new approach to PEC characterization is proposed. First, PECs, which consist of polyethyleneimine and sodium phytate, were chemically and thermally characterized to select the most promising systems. Then, yellow birch (Betula alleghaniensis Britt.) was surface-impregnated under reduced pressure with the two PECs identified as the best options. Overall, wood fire-retardancy was improved with a low weight gain of 2 wt.% without increasing water uptake.

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Suppression of methane/coal dust deflagration flame propagation by CO2/fly ash as a flue gas layer

Liu

Zhao

et al. 2021

Advanced Powder Technology

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Effectiveness and mechanism of sodium phytate as a green inhibitor for the dust deflagration of lysine sulfate

Cited by 18 publications

References 51 publications

Release of P from Pyrolysis, Combustion, and Gasification of Biomass—A Model Compound Study

Release of P from Pyrolysis, Combustion, and Gasification of Biomass—A Model Compound Study

Innovative Polyelectrolyte Treatment to Flame-Retard Wood

Suppression of methane/coal dust deflagration flame propagation by CO2/fly ash as a flue gas layer

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