(19)
(11)EP 0 004 878 A3

(12)EUROPEAN PATENT APPLICATION

(88)Date of publication A3:
14.11.1979 Bulletin 1979/23

(43)Date of publication A2:
31.10.1979 Bulletin 1979/22

(21)Application number: 79100884

(22)Date of filing:  23.03.1979
(84)Designated Contracting States:
BE DE FR GB IT NL SE

(30)Priority: 20.04.1978 US 897993

(71)Applicant: THE FIRESTONE TIRE & RUBBER COMPANY
 ()

(72)Inventor:
  • Fieldhouse, John William
     ()

  


(54)Purification of crude chlorophosphazene compounds by treatment with water


(57) A process for the purification of crude chlorophos-" phazene involves the use of an intermediate purification stage in which the crude chlorophosphazene is subjected to at least two water-washings, following which a final purification step is conducted utilizing a conventional chlorophosphazene purification procedure, such as recrystallization, sublimation, distillation, or melt-filtering and at least a very high purity cyclic chlorophosphazene trimer is then recovered. In a preferred process, the crude chlorophosphazene is subjected to three water-washings prior to the final purification step.





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