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A New Route for the Synthesis of Alkali Polyphosphate from Economical Starting Materials: Preparation and Characterization of Sodium Cyclotriphosphate |
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| Authors: | Doan Pham Minh Jocelyn Ramaroson Ange Nzihou Patrick Sharrock Guy Depelsenaire |
| Institution: | 1. Université de Toulouse, Mines Albi, CNRS, Centre RAPSODEE, Campus Jarlard, F-81013 , Albi cedex 09 , France;2. IUT Paul Sabatier, Avenue Georges Pompidou , 81108 , Castres , France;3. Direction Centrale Recherche et Technologie, Solvay SA, Rue de Ransbeek 310 , B-1120 , Bruxelles , Belgique |
| Abstract: | Abstract Thermal synthesis of sodium cyclotriphosphate (SCTP) – Na3P3O9 was investigated in the temperature range of 150 °C to 750 °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 °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 °C and 750 °C), SCTP was melted and transformed into glassy products. |
| Keywords: | Alkali polyphosphate sodium cyclotriphosphate thermal synthesis |