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

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• 作者：A. I. Sumich ; L. S. Yeshchanka
• 刊名：Russian Journal of Applied Chemistry
• 出版年：2015
• 出版时间：May 2015
• 年：2015
• 卷：88
• 期：5
• 页码：733-737
• 全文大小：610 KB
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• 作者单位：A. I. Sumich (1)
  L. S. Yeshchanka (1)
  
  1. Belarusian State Technological University, ul. Sverdlova 13a, Minsk, 220006, Belarus
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Chemistry
  Industrial Chemistry and Chemical Engineering
  Russian Library of Science
  
• 出版者：MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC.
• ISSN：1608-3296

文摘

Physicochemical transformations were studied in the interaction of powdered Na2CO3 with an orthophosphoric acid–solution at Na2CO3/H3PO4 = 4.0-0.5 and H2O/Na2CO3 = 2.0-.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?H2O, Na2CO3?H2O, NaHCO3, Na3PO4?em class="EmphasisTypeItalic">nH2O (n = 8-2), and Na2HPO4?em class="EmphasisTypeItalic">mH2O (m = 2-2). It was found that the Na2CO3/H3PO4 and H2O/Na2CO3 molar ratios affect the yield of sodium sesquicarbonate Na2CO3?NaHCO2?H2O 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.