Phosphazene trimer purification

Details Phosphazene trimer purification Phosphazene trimer purification

C - Chemistry, Metallurgy

01

B

23/77

C01B 21/098 (2006.01)

Patent

CA 1228713

ABSTRACT PHOSPHAZENE TRIMER PURIFICATION Polymerization grade phosphonitrilic chloride trimer is made by reacting NH4C1 and PC15 in a solvent (e.g. monochlorobenzene) to form a crude trimer solution, filtering the solution to remove unreacted NH4C1, distilling a portion of the solvent to form a hot concentrate, cooling the concentrate to obtain a precipitate, distilling the precipitate at reduced pressure to first remove a forecut and then a heart-cut of polymerization grade phosphonitrilic chloride trimer.

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