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.
Russian Journal of Applied Chemistry – Springer Journals
Published: Aug 15, 2015
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