A NEW ROUTE FOR THE SYNTHESIS OF ALKALI POLYPHOSPHATE FROM ECONOMICAL STARTING MATERIALS: PREPARATION AND CHARACTERIZATION OF SODIUM CYCLOTRIPHOSPHATE
Résumé
Thermal synthesis of sodium cyclotriphosphate (SCTP) - Na3P3O9 was investigated in the temperature range of 150 degrees C to 750 degrees C using sodium chloride (NaCl) and 85 wt% orthophosphoric acid (H3PO4) as economical starting materials. Reaction temperature had a crucial impact on the chloride elimination rate and the formation of SCTP. The best result was obtained at 600 degrees C with 96% of elimination of the initial chloride as hydrochloric acid and 84% of selectivity in SCTP. At lower temperatures, residual chloride contents were high. At higher temperatures (650 degrees C and 750 degrees C), SCTP was melted and transformed into glassy products.
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