Study of formation conditions of sodium sesquicarbonate in H3PO4–Na2CO3–H2O system

Study of formation conditions of sodium sesquicarbonate in H3PO4–Na2CO3–H2O system Physicochemical transformations were studied in the interaction of powdered Na2CO3 with an orthophosphoric acid–solution at Na2CO3/H3PO4 = 4.0–10.5 and H2O/Na2CO3 = 2.0–5.0 molar ratios providing synthesis of a powder-like product with a moisture content not exceeding 10 wt %, which is of interest as a builder of synthetic detergents. The chemical and phase composition of synthesis products was analyzed and it was shown that the main crystalline phases are Na2CO3∙NaHCO3∙2H2O, Na2CO3∙H2O, NaHCO3, Na3PO4∙nH2O (n = 8–12), and Na2HPO4∙mH2O (m = 2–12). It was found that the Na2CO3/H3PO4 and H2O/Na2CO3 molar ratios affect the yield of sodium sesquicarbonate Na2CO3∙NaHCO2∙2H2O whose formation is due to the interaction of Na2CO3∙H2O, NaHCO3, and H2O. It is noted that water introduced into the Na2CO3–H3PO4–H2O system with the orthophosphoric acid solution is mostly expended for the formation of crystal hydrates of carbonate- and phosphate-containing compounds, and just his circumstance provides that powder-like products with prescribed moisture content are formed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Applied Chemistry Springer Journals

Study of formation conditions of sodium sesquicarbonate in H3PO4–Na2CO3–H2O system

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Publisher
Pleiades Publishing
Copyright
Copyright © 2015 by Pleiades Publishing, Ltd.
Subject
Chemistry; Chemistry/Food Science, general; Industrial Chemistry/Chemical Engineering
ISSN
1070-4272
eISSN
1608-3296
D.O.I.
10.1134/S1070427215050031
Publisher site
See Article on Publisher Site

Abstract

Physicochemical transformations were studied in the interaction of powdered Na2CO3 with an orthophosphoric acid–solution at Na2CO3/H3PO4 = 4.0–10.5 and H2O/Na2CO3 = 2.0–5.0 molar ratios providing synthesis of a powder-like product with a moisture content not exceeding 10 wt %, which is of interest as a builder of synthetic detergents. The chemical and phase composition of synthesis products was analyzed and it was shown that the main crystalline phases are Na2CO3∙NaHCO3∙2H2O, Na2CO3∙H2O, NaHCO3, Na3PO4∙nH2O (n = 8–12), and Na2HPO4∙mH2O (m = 2–12). It was found that the Na2CO3/H3PO4 and H2O/Na2CO3 molar ratios affect the yield of sodium sesquicarbonate Na2CO3∙NaHCO2∙2H2O whose formation is due to the interaction of Na2CO3∙H2O, NaHCO3, and H2O. It is noted that water introduced into the Na2CO3–H3PO4–H2O system with the orthophosphoric acid solution is mostly expended for the formation of crystal hydrates of carbonate- and phosphate-containing compounds, and just his circumstance provides that powder-like products with prescribed moisture content are formed.

Journal

Russian Journal of Applied ChemistrySpringer Journals

Published: Aug 15, 2015

References

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