The synthesis novel technology of chlorocyclophosphazene

摘要

The present paper provides a novel process for preparing chlorocyclophosphazene characterized by the combination of: (Ⅰ) The first step of reacting phosphorus pentachloride sublimated with ammonium chloride in an inert organic solvent(such as chlorobenzene) in the presence of N_2 and Zncl_2, and distilling off the solvent from the resulting reaction mixture to obtain a reaction product consisting essentially of chlorocyclophosphazene (up to 93%), and (Ⅱ) the second step of contacting a solution of the reaction product in the heptane with water in proption at temperature of about 60 ℃, separating the resulting aqueous layer from the organic layer, and isolating from the organic layer a mixture of chlorocyclophosphazene consisting essentially of the hexachlorocyclotriphosphazene which yield can reach up to 80%. Factors affecting on the process were also discussed in detail. The results show that the Technology is time saving(only 2.5 hours) under the suitable condition and the total fractional conversion is achieved 99%. The hexachlorocyclotriphosphazene were characterized by IR spectra,and the purity of product is over 98%.