Thermal Decomposition of Sodium Phosphates

Sodium tripolyphosphate (STPP, Na5P3O10) was prepared by the thermal intermolecular dehydration of a spray-dried mixture of sodium phosphates, so that Na/P was 1.67. Thermal analysis, X-ray diffraction, Fourier transform infrared (FT-IR) analysis, and microscopic analysis with the application of a s...

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Bibliographic Details
Published in:Journal of chemical and engineering data 2011-07, Vol.56 (7), p.3095-3099
Main Authors: Banach, Marcin, Makara, Agnieszka
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
Inorganic chemistry and origins of life
Preparations and properties
Salts
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Summary:Sodium tripolyphosphate (STPP, Na5P3O10) was prepared by the thermal intermolecular dehydration of a spray-dried mixture of sodium phosphates, so that Na/P was 1.67. Thermal analysis, X-ray diffraction, Fourier transform infrared (FT-IR) analysis, and microscopic analysis with the application of a scanning electron microscope and an optical microscope with a heating system were applied in investigations. Temperatures of the formation of Na2H2P2O7 (∼463 K) and Na4P2O7 (∼488 K), as well as Na3P3O9 (>513 K) and NaPO3 (∼593 K), were established for the process in which sodium tripolyphosphate is obtained. At over 616 K NaPO3 melts and is the source of the liquid phase in the reaction system. The formation of anhydrous tripolyphosphate attains the highest speed around 563 K.
ISSN:0021-9568
1520-5134
DOI:10.1021/je200381z