Preparation And Crystallization Of Short-Chain Polyphosphates

The preparation of short-chain condensed phosphates of tri-, tetra-, hexa-, and octaphosphates was achieved by hydrolyzing cyclo-tri, cyclo-tetra-, cyclo-hexa-, and cyclo-octophosphates in a strongly basic solution and then precipitating the produced short-chain condensed phosphates from the solution. Triphosphate was precipitated by adding metal cations or alcohol into the solution as well as cystallized compound and was stable at normal temperature. The crystallization of tetra-, hexa-, and octaphosphates was not easy. Metal salts of these oligophosphates were amorphous and were unstable at normal temperature. Guanidine tetraphosphate and ammonium hexaphosphate were crystalline and stable at normal temperature.