Study of thermal dehydration of sodium orthophosphate monosubstituted

Cheremysinova, Anna; Sknar, Irina; Kozlov, Yaroslav; Sverdlikovska, Olga; Sigunov, Oleksii

doi:10.15587/1729-4061.2017.100982

Cited by 5 publications

(4 citation statements)

References 18 publications

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“…Thus, as shown by chemical analysis of initial mixtures and heating products, dehydration of phosphoric acid in the presence of sulfuric acid occurs differently than pure. If at dehydration of orthophosphoric acid [36], starting from 220 0 C and above, there is a loss of P2O5 and the formation of polyphosphoric acids, at the same temperature for phosphoric acid in the presence of sulfuric acid at the above content of SO3 loss of P2O5 is not observed, and at a temperature of 300 0 C appears only pyroform, the content of which decreases with increasing the amount of SO3.…”

Section: Resultsmentioning

confidence: 97%

Study of the Process of Concentration of Wet-Process Phosphoric Acid on the Basis of Karatau Phosphorites

Abilkasova,

Akhmetova,

Kalimoldina

et al. 2024

Preprint

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The article presents data on research of processes of obtaining concentrated phosphoric acid from Karatau phosphate rock. The research of purification of wet-process phosphoric acid by the method of liquid extraction with organic solvents is given. The influence of magnesium salts and sulfuric acid as impurities on the distribution factor of phosphoric acid is determined. It is shown that with increasing the initial concentration of phosphoric acid from 5.38 to 25.61% P2O5, the distribution factor at 25°C increases from 0.178 to 0.436 for n-butyl alcohol, from 0.06 to 0.183 for isoamyl alcohol, and from 0.120 to 0.320 for tributyl phosphate. Increasing the temperature from 25 to 60°C had little or no effect on the distribution factor. It was determined that the distribution factors of phosphoric acid depend on the initial concentration of phosphoric acid in the presence of sulfuric acid. It is shown that phosphoric acid is extracted better with n-butanol. Extraction of phosphoric acid with n-butanol on the principle of counterflow with subsequent azeotropic distillation of the solvent allows to obtain relatively pure and highly concentrated (56-63% of P2O5) phosphoric acid. The process of dehydration of phosphoric acid in the presence of sulfuric acid in the mixture was studied.

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Section: Resultsmentioning

confidence: 97%

Study of the Process of Concentration of Wet-Process Phosphoric Acid on the Basis of Karatau Phosphorites

Abilkasova,

Akhmetova,

Kalimoldina

et al. 2024

Preprint

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“…Reagent was stored in a desiccator over sulphuric acid. Composition of the obtained powder was determined by the method of eluent ion exchange chromatography [27]. Chromatographic separation of phosphates was performed in a glass column with a diameter of 15 mm and a length of 90 mm.…”

Section: Materials and Methods For Examining Anti-corrosive Effect Of...mentioning

confidence: 99%

Study of the anticorrosion effect of polymer phosphates on steel at elevated temperatures

Cheremysinova

Sknar

Plyasovskaya

et al. 2017

EEJET

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Встановлено, що в області температур гарячої деформації сталі розплави поліфосфатів розчиняють оксиди заліза, що містяться в окалині. Метафосфат натрію взаємодіє з оксидом заліза з утворенням змішаних поліфосфатів. Отримані продукти в чотири рази збільшують час до появи перших проявів корозії та до сорока разів зменшують ступінь корозійного ураження сталі. Це обумовлено блокуванням поверхні плівкою змішаних поліфосфатів та забезпеченням значень рН близько 9 в атмосферних умовах Ключові слова: метафосфат натрію, триполіфосфат натрію, змішані поліфосфати, протикорозійна дія, окалина Установлено, что в области температур горячей деформации стали расплавы полифосфатов растворяют окислы железа, содержащиеся в окалине. Метафосфат натрия взаимодействует с оксидом железа с образованием смешанных полифосфатов. Полученные продукты в четыре раза повышают время до появления первых следов коррозии и до сорока раз уменьшают степень коррозионного поражения стали. Это обусловлено блокировкой поверхности пленкой смешанных полифосфатов и обеспечением значений рН около 9 в атмосферных условияхКлючевые слова: метафосфат натрия, триполифосфат натрия, смешанные полифосфаты, противокоррозионное действие, окалина

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“…The application of thermodynamic methods to the analysis of mineralization reactions, especially in hightemperature synthesis and hydration, is well-known and was elucidated in work [1]. Thermodynamic studies are often used for high-temperature reactions [2][3][4][5][6][7], but literary sources confirm that good results are observed for hydration reactions as well [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic analysis of chemical reactions in the systems FeSi–Ca(OH)2–H2O and FeSi2–Ca(OH)2–H2O

Musina¹,

Sihunov²,

Kravchenko³

et al. 2019

VKhKhT

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The use of thermodynamic analysis in silicate technology is an integral part of scientific research and an important component in the study of hydration processes. Thermodynamic analysis allowed substantiating the path of the processes of mineral binders hydration and the stability of hydrated formations, which affects the strength of the concrete. To investigate the solidification processes, one should consider both the thermodynamics of the real solutions of astringent in water and the thermodynamics of the coexistence of mixed crystalline phases. We carried out the thermodynamic analysis of hydration reactions in the systems FeSi-Ca(OH) 2-H 2 O and FeSi 2-Ca(OH) 2-H 2 O, that are used in the production of cellular gas concretes. We showed that there is a possibility to perform directed synthesis of the mineralogical composition of hydration products in the systems under study. The sequence of the chemical reactions and their temperature dependences are established. The developed theoretical model allows understanding the mechanisms of hydration of astringent and building materials on their basis, in particular in the study of physicochemical processes occurring in aerated concretes, prepared by both autoclave and non-autoclave curing, which contain gas-forming ferrosilicon of different chemical compositions.

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Study of thermal dehydration of sodium orthophosphate monosubstituted

Cited by 5 publications

References 18 publications

Study of the Process of Concentration of Wet-Process Phosphoric Acid on the Basis of Karatau Phosphorites

Study of the Process of Concentration of Wet-Process Phosphoric Acid on the Basis of Karatau Phosphorites

Study of the anticorrosion effect of polymer phosphates on steel at elevated temperatures

Thermodynamic analysis of chemical reactions in the systems FeSi–Ca(OH)2–H2O and FeSi2–Ca(OH)2–H2O

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