A new route for the synthesis of alkali polyphosphate from economical starting materials : part II - Influence of reaction conditions

Doan Pham Minh (1) , Ange Nzihou (1) , Patrick Sharrock (1) , Jocelyn Ramaroson (1)

1 RAPSODEE - Centre de recherche d'Albi en génie des procédés des solides divisés, de l'énergie et de l'environnement

Direct synthesis of sodium cyclotriphosphate, Na3P3O9 (SCTP), from sodium chloride and orthophosphoric acid as economical starting materials was investigated. Reaction conditions including the heating rate, reaction plateau time, air flow rate, and Na/P molar ratio were found to be key parameters for the elimination of chloride and for the selectivity in SCTP. High yields in SCTP (94-99%) were obtained. The results are very interesting with respect to a potential industrial application for the synthesis of SCTP from point of view of the low cost of the starting materials.

Mots clés: Sodium polyphosphate; orthophosphoric acid; sodium cyclotriphosphate; sodium chloride; orthophos-phoric acid; thermal synthesis

Domaines: Sciences de l'ingénieur [physics]

Doan Pham Minh, Ange Nzihou, Patrick Sharrock, Jocelyn Ramaroson. A new route for the synthesis of alkali polyphosphate from economical starting materials : part II - Influence of reaction conditions. Phosphorus, Sulfur, and Silicon and the Related Elements, 2012, 187 (10), p. 1132-1140. ⟨10.1080/10426507.2012.668989⟩. ⟨hal-01634015⟩