Process for preparing low molecular weight linear phosphonitrili

Details Process for preparing low molecular weight linear phosphonitrili Process for preparing low molecular weight linear phosphonitrili

1978-08-21

1980-04-15

Gantz, Delbert E.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Halogen containing

C01B 2510

Patent

active

041983815

ABSTRACT:
In the first step of a two step process, PCl.sub.3 and Cl.sub.2 are reacted in a suitable medium. In the second step, PCl.sub.3, Cl.sub.2 and NH.sub.3 are concurrently fed into said medium while keeping the temperature at 100.degree. C. to 140.degree. C. The feeds of the reactants are controlled so that until the first 1/2 of the NH.sub.3 has been reacted the molar ratio of PCl.sub.3 :NH.sub.3 (including the PCl.sub.3 of the first step) is kept above 2. Thereafter, the feeds are adjusted so that with respect to the total amount of ammonia, said molar ratio is between 1.2 and 1.5. Linear phosphonitrilic chloride oligomers having a number average degree of polymerization from 2 to 9 are produced in high yield.

REFERENCES:
patent: 1914750 (1933-06-01), Marsh
patent: 3359080 (1967-12-01), Ridgway et al.
patent: 3656916 (1972-04-01), Schiedermaier et al.
patent: 3669633 (1972-06-01), Beinfest et al.
patent: 3780162 (1973-12-01), Bergeron et al.
patent: 3860693 (1975-01-01), Graham

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