eyclo-三リン酸ナトリウムの希アルカリ性加水分解による三リン酸ナトリウムの合成

抄録

The pure Na₅P₃O₁₀, (phase I ) free from orthophosphatea s well as other polyphosphatews as preparedb y the followingp rocedure. Twenty gram of Na₃P₃O₉, prepared by heating NaH₂PO₄ at 530°C, was dissolved in 200 cm³ of water and 25 cm³ of 6 mol dm^-3 NaOH aqueous solution was added. After the solution was allowedt o stand at room temperaturef or 72---9h6, equalvolume of ethanol was added to produce the precipitate, which was separated by Biichner funnel, and washed with (1: 1) mixture of ethanol and water and finally with ethanol. The precipitatew as dried in air to obtain the Na₅P₃O₁₀·6H₂O, which changed to anhydrous form by heating at 550°C.