Phosphazene trimer purification

Details Phosphazene trimer purification Phosphazene trimer purification

1984-10-05

1986-12-09

Doll, John

Chemistry of inorganic compounds

Phosphorus or compound thereof

Halogen containing

23295R, C01B 2510

Patent

active

046279679

ABSTRACT:
Polymerization grade phosphonitrilic chloride trimer is made by reacting NH.sub.4 Cl and PCl.sub.5 in a solvent (e.g. monochlorobenzene) to form a crude trimer solution, filtering the solution to remove unreacted NH.sub.4 Cl, 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.

REFERENCES:
patent: 4175113 (1979-11-01), Fieldhouse
patent: 4382914 (1983-05-01), Horie et al.

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