The synthesis and thermal property of sodium cyclo-octaphosphate

✍ Scribed by Makoto Watanabe; Tomohiko Honda

• Publisher: John Wiley and Sons
• Year: 1991
• Tongue: English
• Weight: 372 KB
• Volume: 2
• Category: Article
• ISSN: 1042-7163
• DOI: 10.1002/hc.520020514

✦ Synopsis

Sodium cyclo-octaphosphate heptahydrate, (NaPO& -

H a , has been made by heating lead cyclo-tetraphosphate at 340"C, dissolving the thermal product in a 3% aqueous solution of tetrasodium ethylenediaminetetraacetate, and then crystallizing it by addition of sodium chloride and acetone to the solution.

When the cyclo-octaphosphate was heated up to W C , it decomposed to produce phosphates with both shorter and longer chain lengths. A main product at 300" to 350°C was sodium cyclo-triphosphate, and the thermal product melted at about 630°C.