Process for purifying cyclic phosphonitrilic chlorides

Details Process for purifying cyclic phosphonitrilic chlorides Process for purifying cyclic phosphonitrilic chlorides

1979-05-31

1980-12-23

Langel, Wayne A.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Halogen containing

C01B 2510

Patent

active

042410347

ABSTRACT:
A process for improving the purity of phosphonitrilic chloride polymers, namely the trimer and tetramer by (1) contacting a solution of open-chain phosphonitrilic chloride oligomers admixed with cyclic oligomers of phosphonitrilic chloride in a normally liquid hydrocarbon with aqueous lower alkylnitrile, (2) separating the liquid hydrocarbon phase laden with trimer and some tetramer from the aqueous phase thereby produced, and (3) recovering highly purified cyclic trimer and tetramer from the hydrocarbon phase.

REFERENCES:
patent: 3008799 (1961-11-01), Paddock et al.
patent: 3378353 (1968-04-01), Hands
patent: 3952086 (1976-04-01), Fieldhouse

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