Catalytic synthesizing method of hexa chloro cyclotripolyphosphazene

This invention discloses hexachloro ring trimerization phosphonitrile catalysis synthesis method. 1.1-1.5mol ammonium chloride, complex catalyst made uo by 0.012-0.022mol metal compound and 0.030-0.070mol pyridine substance are added into reaction kettle, and then 1000-1300 ml chlorobenzene is added and heated to dissolve. 1mol phosphoric chloride is added at back flow state, then 1 mol phosphoric chloride is added and continue back flow 3-5 hours, then stoped and cooled down to room temperature, and filter off unreacted ammonium chloride and distill out chlorobenzene. 550-600ml petroleum ether is added into residual, then they are heated back flow and extracting for 0.5 to 1 hours, then they are cooled down and filtrated, distilled petroleum ether, finally the crystal is recrystallized and sublimed by normal heptane, and pure white srystal hexachloro ring trimerization phosphonitrile is got. The catalysis synthesis method in this invention uses special complex catalyst, that is metal compound and pyridine or its alkyl substitute to shorten reaction time to 3-5 hours, and improves yield to 80-90 percent, its operation is simple, so is worth extending.