Study of thermal dehydration of sodium orthophosphate monosubstituted

Authors

DOI:

https://doi.org/10.15587/1729-4061.2017.100982

Keywords:

polymeric phosphates, high-temperature dehydration, sodium orthophosphate monosubstituted, chemical scheme

Abstract

Depending on the conditions of conducting the synthesis, it is possible to obtain polymeric phosphates of different composition and structure. The mixtures of polyphosphates, employed in the production of technological lubricants, are expedient to synthesize by the high-temperature dehydration of sodium orthophosphate monosubstituted. The temperature ranges, over which the thermochemical transformations of sodium orthophosphate monosubstituted with the formation of polyphosphates proceed, are established by the thermogravimetric method. The composition of polyphosphates is determined using the X-ray phase analysis. Quantitative composition of the mixtures of polyphosphates is determined by applying the original method of eluent ion-exchange chromatography. It is established that the basic products of thermal dehydration of sodium orthophosphate monosubstituted in the range of temperatures 200–650 °C are Na3Р3О9, Na2H2P2O7 and Na6P6O18. Thermochemical transformations of NaH2PO4 into Na6P6O18 at temperature 650 °C are accompanied by the side reactions of formation of Na3H2P3O10. We proposed the chemical scheme of the high-temperature dehydration of sodium orthophosphate monosubstituted. Kinetics of the isothermal process of obtaining the polymeric phosphates from sodium orthophosphate monosubstituted at different temperatures is examined.

We established quantitative composition of the mixtures of inorganic polymeric phosphates depending on the duration of isothermal process of dehydration. The possibility of obtaining a salt mixture of polymeric phosphates of the assigned qualitative and quantitative composition is demonstrated. We proposed to use the mixture: 76 % Na6P6O18, 8 % Na2H2P2O7, 8 % Na3H2P3O10, 8 % NaH2PO4, obtained at 650 °C, as the basic phosphate component of technological lubricants for the hot rolling of pipes.

Author Biographies

Anna Cheremysinova, Ukrainian State University of Chemical Technology Gagarina ave., 8, Dnipro, Ukraine, 49005

PhD, Associate Professor

Department of Processes, Apparatus and General Chemical Technology

Irina Sknar, Ukrainian State University of Chemical Technology Gagarina ave., 8, Dnipro, Ukraine, 49005

PhD, Associate Professor

Department of Processes, Devices and General Chemical Technology

Yaroslav Kozlov, Ukrainian State University of Chemical Technology Gagarina ave., 8, Dnipro, Ukraine, 49005

PhD, Associate Professor

Department of Energetics

Olga Sverdlikovska, Ukrainian State University of Chemical Technology Gagarina ave., 8, Dnipro, Ukraine, 49005

PhD, Associate Professor

Department of Processing polymers and photo-, nano -, and polygraphic materials

Oleksii Sigunov, Ukrainian State University of Chemical Technology Gagarina ave., 8, Dnipro, Ukraine, 49005

PhD, Associate Professor

Department of Chemical Technology of Astringent Materials

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Published

2017-06-08

How to Cite

Cheremysinova, A., Sknar, I., Kozlov, Y., Sverdlikovska, O., & Sigunov, O. (2017). Study of thermal dehydration of sodium orthophosphate monosubstituted. Eastern-European Journal of Enterprise Technologies, 3(6 (87), 60–66. https://doi.org/10.15587/1729-4061.2017.100982

Issue

Vol. 3 No. 6 (87) (2017): Technology organic and inorganic substances

Section

Technology organic and inorganic substances

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Copyright (c) 2017 Anna Cheremysinova, Irina Sknar, Yaroslav Kozlov, Olga Sverdlikovska, Oleksii Sigunov

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